Tokushima University / Educator and Researcher Directory --- Asaoka, Kenzo

Personal Web Page

https://researchmap.jp/read0017455 (researchmap)

Field of Study

○	Dentistry
○	Biomaterials

Subject of Study

○
○	Dental Materials (Porcelain, Investments, Casting, Porous materials, Functional materials)

Book / Paper

Book:

1.	Kenzo Asaoka : 金属系バイオマテリアルと安全性, フロンティア出版, Tokyo, Jun. 2010.
2.	Kenzo Asaoka and Kunimitsu Maejima : Hydrogen-related degradation of mechanical properties f titanium and titanium alloys, ASTM International, Exton, PA, Mar. 2010.
3.	Kenzo Asaoka, John A Tesk and Osamu Okuno : High-Temperature Investment, Quintessence Publishing Co, Inc, Chicago, 2008.
4.	Kenzo Asaoka : チタン多孔体とリン酸カルシウムの修飾, サイエンス&テクノロジー株式会社, Tokyo, Mar. 2008.
5.	Kenzo Asaoka : コア歯科理工学, Ishiyaku Publishers,Inc., Tokyo, Mar. 2008.
6.	Kenichi Hamada, Youji Miyamoto and Kenzo Asaoka : 骨修復材, Ishiyaku Publishers,Inc., Tokyo, May 2006.
7.	Kenzo Asaoka : A Glossary for Dental Mateials and Devices, Ishiyaku Publishers,Inc., Tokyo, Sep. 2005.
8.	Kenzo Asaoka, Osamu Okuno and John Tesk : Dental Materials and Their selection, 3rd Ed; WJ. O'Brien, --- High temperature investments ---, Quintessence Publishing Co, Inc, Chicago, 2002.
9.	Kenzo Asaoka and Ken'ichi Yokoyama : Structural Biomaterials for 21st Century, --- Hydrogen embrittlement of Ni-Ti alloy in biological environment ---, TMS(The Minerals, Metals & Materials Society), Pennsylvania, Feb. 2001.
10.	Fumiaki Kawano, Tetsuo Ichikawa and Kenzo Asaoka : 症例にあわせた歯科材料の選択, クインテッセンス出版, Oct. 1999. (Keyword) レジン材料 / 金属材料 / ハイブリッド材料
11.	Kenzo Asaoka : 歯と口と健康, Ishiyaku Publishers,Inc., Tokyo, Aug. 1998.
12.	Kenzo Asaoka : 歯科技工学臨床研修講座, Ishiyaku Publishers,Inc., Tokyo, Jan. 1998.
13.	Kenzo Asaoka : 生体微量元素, 株式会社廣川書店, Tokyo, Mar. 1994.
14.	Kenzo Asaoka : 生体微量元素, 株式会社廣川書店, Tokyo, Mar. 1994.
15.	Ishi Miura, Hitoshi Hamanaka, Osamu Okuno and Kenzo Asaoka : Multiphase biomedical materials, --- Metallic biomaterials for replacement of hard tissue ---, VSP, Utrecht, 1989.
16.	Kenzo Asaoka : 要説歯科理工学実習の指針, 株式会社書林, Tokyo, Feb. 1983.
17.	Ishi Miura and Kenzo Asaoka : DE泉書歯科用銀合金, Ishiyaku Publishers,Inc., Tokyo, Nov. 1981.

Academic Paper (Judged Full Paper):

1.	Shinya Horiuchi, Masahiro Hiasa, Akihiro Yasue, Kazumitsu Sekine, Kenichi Hamada, Kenzo Asaoka and Eiji Tanaka : Fabrications of zinc-releasing biocement combining zinc calcium phosphate to calcium phosphate cement., Journal of the Mechanical Behavior of Biomedical Materials, Vol.29C, 151-160, 2014. (Summary) Recently, zinc-releasing bioceramics have been the focus of much attention owing to their bone-forming ability. Thus, some types of zinc-containing calcium phosphate (e.g., zinc-doped tricalcium phosphate and zinc-substituted hydroxyapatite) are examined and their osteoblastic cell responses determined. In this investigation, we studied the effects of zinc calcium phosphate (ZCP) derived from zinc phosphate incorporated into calcium phosphate cement (CPC) in terms of its setting reaction and MC3T3-E1 osteoblast-like cell responses. Compositional analysis by powder X-ray diffraction analysis revealed that HAP crystals were precipitated in the CPC containing 10 or 30wt% ZCP after successfully hardening. However, the crystal growth observed by scanning electron microscopy was delayed in the presence of additional ZCP. These findings indicate that the additional zinc inhibits crystal growth and the conversion of CPC to the HAP crystals. The proliferation of the cells and alkaline phosphatase (ALP) activity were enhanced when 10wt% ZCP was added to CPC. Taken together, ZCP added CPC at an appropriate fraction has a potent promotional effect on bone substitute biomaterials. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.jmbbm.2013.09.005 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 24090874 ● Summary page in Scopus @ Elsevier: 2-s2.0-84884959362 (DOI: 10.1016/j.jmbbm.2013.09.005, PubMed: 24090874, Elsevier: Scopus)
2.	Emi Takegawa, Shihoko Inui, Kenichi Hamada, Eiichi Honda and Kenzo Asaoka : Magnetic susceptibility and hardness of Au-xPt-yNb alloys for biomedical applications, Acta Biomaterialia, Vol.9, 8449-8453, 2013. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.actbio.2013.05.028 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.actbio.2013.05.028 (DOI: 10.1016/j.actbio.2013.05.028)
3.	Ji-Young Bae and Kenzo Asaoka : Effects of colloidal silica suspension mixing on porosity of phosphate-bonded investments after setting and heating processes, Dental Materials Journal, Vol.32, No.3, 502-507, 2013. (Summary) A numerical simulation model, which was based on the setting and heating reactions of the binder phase of phosphate-bonded investment compacts, was developed to compute the porosities of set and burnout compacts. Densities and concentrations of microsilica particles in dilute suspension were measured and input into the simulation model. Validity of the model was confirmed by experimental results, that is, colloidal silica suspensions were prepared using different silica concentrations and mixed with investment powders. Porosities of these set and burnout compacts were experimentally measured. Effects of these factors on the porosity of compacts were examined using the developed simulation model: liquid/powder (L/P) ratio, concentration of microsilica particles in colloidal silica suspension, and ratio of binder component (NH4H2PO4) in investment powder. It was concluded that numerical simulation is a viable tool for dental materials research. (Tokushima University Institutional Repository) ● Metadata: 109402 (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.2012-280 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 23719014 ● Search Scopus @ Elsevier (PMID): 23719014 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.2012-280 (Tokushima University Institutional Repository: 109402, DOI: 10.4012/dmj.2012-280, PubMed: 23719014)
4.	Yoshihito Naitou, Jiyon Be, Yoritoki Tomotake, Kenichi Hamada, Kenzo Asaoka and Tetsuo Ichikawa : Formability and mechanical properties of porous titanium produced by a moldless process, Journal of Biomedical Materials Research. Part B, Applied Biomaterials, Vol.101, No.6, 1090-1094, 2013. (Summary) Tailor-made porous titanium implants show great promise in both orthopedic and dental applications. However, traditional powder metallurgical processes require a high-cost mold, making them economically unviable for producing unique devices. In this study, a mixture of titanium powder and an inlay wax binder was developed for moldless forming and sintering. The formability of the mixture, the dimensional changes after sintering, and the physical and mechanical properties of the sintered porous titanium were evaluated. A 90:10 wt % mixture of Ti powder and wax binder was created manually at 70°C. After debindering, the specimen was sintered in Ar at 1100°C without any mold for 1, 5, and 10 h. The shrinkage, porosity, absorption ratio, bending and compressive strength, and elastic modulus were measured. The bending strength (135-356 MPa), compression strength (178-1226 MPa), and elastic modulus (24-54 GPa) increased with sintering time; the shrinkage also increased, whereas the porosity (from 37.1 to 29.7%) and absorption ratio decreased. The high formability of the binder/metal powder mixture presents a clear advantage for fabricating tailor-made bone and hard tissue substitution units. Moreover, the sintered compacts showed high strength and an elastic modulus comparable to that of cortical bone. (Keyword) Biocompatible Materials / Compressive Strength / Dental Implants / Elastic Modulus / Humans / Materials Testing / Metallurgy / Porosity / Prostheses and Implants / titanium (Link to Publication Site) ● Publication site (DOI): 10.1002/jbm.b.32919 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 23559484 ● Summary page in Scopus @ Elsevier: 2-s2.0-84880509056 (DOI: 10.1002/jbm.b.32919, PubMed: 23559484, Elsevier: Scopus)
5.	Kenzo Asaoka : 埋没材の加熱法について考える, 日本歯技, Vol.527, 33-40, 2013.
6.	Akiyoshi Sugawara, Kenzo Asaoka and Shinn-Jyh Ding : Calcium phosphate-based cements: clinical needs and recent progress, Journal of Materials Chemistry. B, Materials for Biology and Medicine, Vol.2013, No.1, 1081-1089, 2013. (Link to Publication Site) ● Publication site (DOI): 10.1039/c2tb00061j (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1039/c2tb00061j (DOI: 10.1039/c2tb00061j)
7.	Kenzo Asaoka, Ji-Young Bae and Hae-Hyoung Lee : Porosity of dental phosphate-bonded investments after setting and heating processes, Dental Materials Journal, Vol.31, No.5, 835-842, 2012. (Summary) Porosities of set and burnout compacts of phosphate-bonded investments were determined. A gas pycnometer was used to measure the volumes, and hence the densities, of fine powders and porous compacts. Porosities of set and burnout compacts were then obtained from these data for as-received powders and dry set compacts by a numerical simulation method, subsequently leading on to the estimated compositions of conventional and rapid-heating investments used in this study. Excess water content in the hardening investment compact was evaluated as a function of setting time elapsed from the start of mixing. Porosities were about 24-32% for set compacts and 43% for burnout compacts, which well agreed with the numerically computed results. It was concluded that the functional composition of investment powder needed to achieve the optimal porosity as well as process parameters such as water-powder (W/P) ratio and keeping time of mixed investment casting slurry before heat treatment could be determined using the numerical simulation method developed in this study. (Keyword) Porosity / Density / Refractory / Phosphate-bonded investment (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.2012-071 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679692091520 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.2012-071 (DOI: 10.4012/dmj.2012-071, CiNii: 1390282679692091520)
8.	Kazumitsu Sekine, Bae Young Ji, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : Evaluation of newly developed bone cement introducing Strontium consistencies for bone regenerative substitute, Transactions of the Japanese Society for Medical and Biological Engineering, 2012.
9.	Hae-Hyoung Lee, Chung-Jae Lee and Kenzo Asaoka : Correlation in the mechanical properties of acrylic denture base resins, Dental Materials Journal, Vol.31, No.1, 157-164, 2012. (Summary) The aim of the present study was to measure various mechanical properties of acrylic denture base resins, including flexural modulus, flexural strength, fracture toughness, Barcol and Vickers hardness and their related properties, and to investigate correlations between different mechanical properties. Resin specimens were prepared according to manufacturers' recommended instructions. The mechanical properties were measured under specified standards. Data from the mechanical tests were examined using correlation tests. In general, the mean results for mechanical properties of each specimen group were differently ranked depending on the tested mechanical property. The flexural modulus value showed strong or reasonable positive correlation with those of proportional limit, flexural strength, and surface hardness. In contrast, fracture toughness revealed strong negative correlations with the flexural parameters and hardness values. Results of correlation tests for the different parameters can be used for estimation of mechanical performance of acrylic denture bases in clinical situation and for quality control purposes. (Keyword) Acrylic denture base resin / Mechanical properties / correlation (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.2011-205 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001204715339904 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.2011-205 (DOI: 10.4012/dmj.2011-205, CiNii: 1390001204715339904)
10.	Kenzo Asaoka, Ji-Young Bae and Hae-Hyoung Lee : Porosity of dental gypsum-bonded investments in setting and heating process, Dental Materials Journal, Vol.31, No.1, 120-124, 2012. (Summary) The porosity of gypsum-bonded investments for set and heated compacts was measured and theoretically computed quantitatively, because porosity is an effective factor for determining the strength, setting/heating expansion, and permeability of compacts at casting. A helium gas pycnometer was used to measure the solid volume of fine powders, powder-water mixtures, and porous compacts. The compositions of the conventional cristobalite investment and rapid-heating type investment were estimated from the measured solid densities of the as-received powders and the set investments. The porosity and water content of the set investments were determined from the experimental data. Excess water content in the set investment was calculated in relation to the elapsed time from the start of mixing with water. The experimental porosities of the set and heated investments were about 40% for dry set >compacts and about 50% for fired compacts, which well agreed with the numerically computed estimations, respectively. (Keyword) Gypsum-bonded investment / Porosity / Calcium sulfate / Refractory (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.2011-199 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001204715350144 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.2011-199 (DOI: 10.4012/dmj.2011-199, CiNii: 1390001204715350144)
11.	Maki Hosoki, Toyoko Satsuma, Keisuke Nishigawa, Hisahiro Takeuchi and Kenzo Asaoka : A Useful and Non-invasive Microanalytical Method for Dental Restoration Materials, Applied Surface Science, Vol.262, 258-262, 2012. (Keyword) Microanalytical Method / EDX / Metal allergy (Link to Publication Site) ● Publication site (DOI): 10.1016/j.apsusc.2012.08.119 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.apsusc.2012.08.119 (DOI: 10.1016/j.apsusc.2012.08.119)
12.	Shinya Horiuchi, Shingo Kuroda, Masahiro Hiasa, Toshiyuki Suge, Seitaro Saku, Kenichi Hamada, Takashi Matsuo, Kenzo Asaoka and Eiji Tanaka : Reinforcement of bond strength of self-etching orthodontic adhesive., The Angle Orthodontist, Vol.82, No.1, 30-35, 2011. (Summary) Abstract Objective: To determine the reinforcement of bond strength of a self-etching system by applying a pretreatment agent. Materials and Methods: Sixty extracted human premolars were used in this study. The enamel surfaces were treated with four pretreatment agents?phosphoric acid, polyacrylic acid, citric acid, and ammonium hexafluorosilicate (SiF)?and were examined under a scanning electron microscope. Afterward, orthodontic brackets were bonded with a self-etching adhesive system (n ?=? 10 for each agent), and shear bond strength was measured through a debonding process. The adhesive remnant index (ARI) was also assessed. Results: Enamel surfaces treated with polyacrylic acid seemed almost the same as intact enamel. Treatment with SiF induced slight shallow depressions compared with the intact enamel. On the other hand, enamel surfaces treated with citric acid and phosphoric acid showed severe etching patterns. All pretreatments increased the bond strength, but SiF-treated specimens revealed the greatest strength (12.201 ? 1.048?MPa), followed by polyacrylic acid (12.030 ? 2.103?MPa). The control group with no pretreatment showed the least strength (9.078 ? 1.678?MPa). All pretreatments increased ARI score compared with the control group. Conclusions: Surface conditioning before bracket adhesion could reinforce the bond strength of the self-etching adhesive system, resulting in a more reliable bonding system. (Link to Publication Site) ● Publication site (DOI): 10.2319/012011-39.1 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 21751834 ● Search Scopus @ Elsevier (PMID): 21751834 ● Search Scopus @ Elsevier (DOI): 10.2319/012011-39.1 (DOI: 10.2319/012011-39.1, PubMed: 21751834)
13.	Seitaro Saku, Hirotomo Kotake, RJ Vilchis Scougall, Shizue Ohashi, Masato Hotta, Shinya Horiuchi, Kenichi Hamada, Kenzo Asaoka, Eiji Tanaka and Kohji Yamamoto : Antibacterial activity of composite resin with glass-ionomer filler particles, Dental Materials Journal, Vol.29, No.2, 193-198, 2010. (Summary) The purpose of this study was to examine the antibacterial activity of composite resin with glass-ionomer filler particles versus that of contemporary commercial composite resins. Three composite resins were used: Beautifil II (containing S-PRG filler), Clearfil AP-X, and Filtek Z250. Resin blocks were bonded to maxillary first molars, and plaque accumulation on the resin block surface was examined after 8 hours. For the antibacterial test, the number of Streptococcus mutans in contact with the composite resin blocks after incubation for 12 hours was determined, and adherence of radiolabeled bacteria was evaluated. Less dental plaque was formed on Beautifil II resin block as compared to the other two materials. Antibacterial test revealed that there were no significant differences in the number of Streptococcus mutans among the three composite resins. However, the adherence of radiolabeled bacteria to the saliva-treated resin surface was significantly (p>0.01) lower in Beautifil II than in the other two materials. These results suggested that Beautifil II could reduce dental plaque formation and bacterial adherence, leading to prevention of secondary caries (Keyword) Adult / Anti-Bacterial Agents / Bacterial Adhesion / Barium Compounds / Bisphenol A-Glycidyl Methacrylate / Colony Count, Microbial / Composite Resins / Dental Materials / Dental Plaque / Female / Glass / Glass Ionomer Cements / Humans / Male / Materials Testing / Methacrylates / Resin Cements / Saliva / Silicon Dioxide / Single-Blind Method / Spectrometry, X-Ray Emission / Streptococcus mutans / Surface Properties / Time Factors / Zirconium (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.2009-050 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 20379030 ● Search Scopus @ Elsevier (PMID): 20379030 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.2009-050 (DOI: 10.4012/dmj.2009-050, PubMed: 20379030)
14.	Masahiro Hiasa, Masahiro Abe, Ayako Nakano, Asuka Oda, Hiroe Amou, Shinsuke Kido, Kyoko Takeuchi, Kumiko Kagawa, Kenichiro Yata, Toshihiro Hashimoto, Shuji Ozaki, Kenzo Asaoka, Eiji Tanaka, Keiji Moriyama and Toshio Matsumoto : GM-CSF and IL-4 induce dendritic cell differentiation and disrupt osteoclastogenesis through M-CSF receptor shedding by up-regulation of TNF-{alpha} converting enzyme (TACE), Blood, Vol.114, No.20, 4517-4526, 2009. (Summary) Monocytes give rise to macrophages, osteoclasts (OCs), and dendritic cells (DCs). M-CSF and RANK ligand induce OC differentiation from monocytes, while GM-CSF and IL-4 trigger monocytic differentiation into DCs. These two differentiation pathways occur in a mutually exclusive manner. However, regulatory mechanisms for the polarization of monocytic differentiation are still unclear. The present study was undertaken to clarify the mechanism of triggering the deflection of OC and DC differentiation from monocytes. GM-CSF and IL-4 abolished monocytic differentiation into OCs while inducing DC differentiation even in the presence of M-CSF and RANK ligand. GM-CSF and IL-4 in combination potently up-regulate TNF-alpha converting enzyme (TACE) expression and activity in monocytes, causing ectodomain shedding of the membrane-bound M-CSF receptor, resulting in the disruption of its phosphorylation by M-CSF as well as the induction of osteoclastogenesis from monocytes by M-CSF and RANK ligand. Interestingly, TACE inhibition robustly causes the resumption of the surface expression of M-CSF receptors on monocytes, which facilitates M-CSF-mediated phosphorylation of M-CSF receptors and macrophage/OC differentiation while impairing GM-CSF and IL-4-mediated DC differentiation from monocytes. These results reveal a novel proteolytic regulation of M-CSF receptor expression in monocytes to control M-CSF signaling and monocytic differentiation into macrophage/OC-lineage cells or DCs. (Keyword) ADAM Proteins / Blotting, Western / Cell Differentiation / Dendritic Cells / Fluorescent Antibody Technique / Granulocyte-Macrophage Colony-Stimulating Factor / Humans / Interleukin-4 / Macrophages / Monocytes / Osteoclasts / RANK Ligand / Receptor, Macrophage Colony-Stimulating Factor / Reverse Transcriptase Polymerase Chain Reaction / Up-Regulation (Link to Publication Site) ● Publication site (DOI): 10.1182/blood-2009-04-215020 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 19762488 ● Search Scopus @ Elsevier (PMID): 19762488 ● Search Scopus @ Elsevier (DOI): 10.1182/blood-2009-04-215020 (DOI: 10.1182/blood-2009-04-215020, PubMed: 19762488)
15.	Shinya Horiuchi, Kazuyuki Kaneko, H Mori, Emi Kawakami, T Tsukahara, K Yamamoto, Kenichi Hamada, Kenzo Asaoka and Eiji Tanaka : Enamel bonding of self-etching and phosphoric acid-etching orthodontic adhesives in simulated clinical conditions: Debonding force and enamel surface, Dental Materials Journal, Vol.28, No.4, 419-425, 2009. (Summary) This study aimed to evaluate the effectiveness of self-etching and phosphoric acid-etching orthodontic adhesives for enamel bonding in simulated clinical conditions. By using two self-etching (Transbond Plus, TP; Beauty Ortho Bond, BB) and two acid-etching (Transbond XT, TX; Superbond Orthomite, SB) adhesives, orthodontic brackets were bonded on human premolars (n=10 for each adhesive). Ten teeth without bracket bonding, i.e., intact enamel surfaces, were used as control for SEM observation. After 7-day storage in lactic acid solution, bracket debonding force by means of debonding pliers, adhesive remnant index (ARI), and enamel surface morphology were examined. All the tested adhesives exhibited sufficient bond strength for clinical use. The ARI scores were almost the same among the four adhesives. In terms of SEM observation, the enamel surfaces in the control and TP groups showed a slight change after immersion in lactic acid solution, while the BB group showed less change on the enamel surface compared with the TP group. Meanwhile, the two acid-etching adhesives caused considerable demineralization. Taken together, these findings indicated that the action of self-etching systems was evidently more conservative. (Keyword) Bicuspid / Dental Bonding / Dental Debonding / Dental Enamel / Dental Etching / Dental Stress Analysis / Humans / Materials Testing / Orthodontic Brackets / Resin Cements / Surface Properties (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.28.419 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 19721278 ● Search Scopus @ Elsevier (PMID): 19721278 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.28.419 (DOI: 10.4012/dmj.28.419, PubMed: 19721278)
16.	Shinya Horiuchi, Kenzo Asaoka and Eiji Tanaka : Development of a novel cement by conversion of hopeite in set zinc phosphate cement into biocompatible apatite, Bio-Medical Materials and Engineering, Vol.19, No.2, 121-131, 2009. (Summary) Synthetic bone cement that has zinc oxide core particles covered with hydroxyapatite (HAP) was developed; that is, the conversion of hopeite, the traditional zinc phosphate cement, into HAP was attempted. Here, hopeite is the final product of the reaction between powders and trituration liquid of the traditional zinc phosphate cement. This cement may have many advantages not only in terms of biological functions but also the setting process of the traditional cement and the mechanical properties of the developed compact if the hopeite can be converted into calcium phosphate (CP). In this study, calcium nitrate solutions of various concentrations were used for the conversion of hopeite crystals into CP. The products after the solution treatment were analyzed by X-ray diffractometry (XRD), Fourier transform infrared spectrometry (FTIR), and scanning electron microscope (SEM) observation. These results indicated that the converted scholzite crystals could be partially detected. Several types of set zinc phosphate cement with different P/L ratios were arranged. The surface products of the set cement after the solution treatment were analyzed by XRD. However, the crystal phase such as hopeite was not detected except for zinc oxide. The set cement, which was treated with the calcium nitrate solution, was immersed in simulated body fluid (SBF). HAP-like crystals on the set cement could be detected for the specimens immersed for 4 weeks. These findings suggested that the binding phase in the set cement could be converted into HAP by immersion in SBF. (Keyword) Absorption / Adhesiveness / Biocompatible Materials / Body Fluids / Bone Cements / Crystallization / Durapatite / Hardness / Materials Testing / Particle Size / Phosphates / Porosity / Surface Properties / Zinc Compounds (Link to Publication Site) ● Publication site (DOI): 10.3233/BME-2009-0571 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 19581705 ● Search Scopus @ Elsevier (PMID): 19581705 ● Search Scopus @ Elsevier (DOI): 10.3233/BME-2009-0571 (DOI: 10.3233/BME-2009-0571, PubMed: 19581705)
17.	Razia Sultana, Kenichi Hamada, Tetsuo Ichikawa and Kenzo Asaoka : Effects of heat treatment on the bioactivity of surface-modified titanium in calcium solution, Bio-Medical Materials and Engineering, Vol.19, No.2-3, 193-204, 2009. (Summary) The purpose of this study was to determine the effects of heat treatment on the bioactivity of hydrothermal-modified titanium in CaO solution for improved bioactivity by immersion in simulated body fluid (SBF). The hydrothermal treatment of titanium in CaO solution was performed at 121 degrees C at 0.2 MPa for 1 h in an autoclave followed by 1 h heat treatments at 200, 400, 600 and 800 degrees C simultaneously. The bioactivity of titanium was evaluated by hydroxyapatite precipitation during immersion in SBF. Surface microstructure changes after the heat treatments and immersion in SBF were determined by X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Heat treatments at high temperatures (600 and 800 degrees C) promoted the synthesis of anatase, increased the thickness of the titanium oxide layer on the modified titanium surface and promoted the synthesis of calcium titanate, which possibly promoted the precipitation of apatite in SBF. The extent of precipitations increased with the time of immersion in SBF and the temperature of the heat treatment. Island-like deposits of needle-like crystals were observed only on the surface of the 600 and 800 degrees C heat-treated specimens after two or four week immersions in SBF. The results suggested that treatments of the surface of hydrothermal-treated titanium specimens at high temperatures (600 and 800 degrees C) could be effective for the surface modification of titanium as an implant material offering better osseointegration. (Keyword) Absorption / Biocompatible Materials / Body Fluids / Calcium / Crystallization / Hot Temperature / Materials Testing / Particle Size / Porosity / Solutions / Surface Properties / Titanium (Link to Publication Site) ● Publication site (DOI): 10.3233/BME-2008-0580 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 19581714 ● Search Scopus @ Elsevier (PMID): 19581714 ● Search Scopus @ Elsevier (DOI): 10.3233/BME-2008-0580 (DOI: 10.3233/BME-2008-0580, PubMed: 19581714)
18.	Maki Hosoki, Eiichi Bando, Kenzo Asaoka, Hisahiro Takeuchi and Keisuke Nishigawa : Assessment of allergic hypersensitivity to dental materials, Bio-Medical Materials and Engineering, Vol.19, No.1, 53-61, 2009. (Summary) Some metallic materials in dental prostheses may cause allergic hypersensitivity. Symptoms appear not only in the oral cavity, but also on hands, feet or the entire body. Release of metal ions is thought to cause the allergic reactions; micro-particles of the corrosion products of the metal and/or ionic metal hydroxides/oxides may be the allergens. The study purpose was to review clinical surveillance of dental allergic hypersensitivity in our dental hospital. From July 2000 to June 2005, 212 patients with suspected dental metal allergy were patch tested with 26 reagents, including 19 ready-made patch test reagents (Patch test reagents, Torii Pharmaceutical Corporation, Tokyo, Japan) and 9 custom-made reagents. One-hundred-and-sixty-seven patients were females (78.8%) and 45 patients were males (21.2%). A total of 148 patients (69.8%) had one or more positive patch test reactions. The most common allergens were nickel (25.0%), palladium (24.4%), chromium (16.7%), cobalt (15.9%) and stannum (12.5%). Typical allergic symptoms and diagnoses were Pustulosis palmaris et plantaris, lichen planus, stomatitis and contact dermatitis. This study indicates that dentists and dental researchers should be concerned about the allergenic potential of dental metal materials. (Keyword) Dental Materials / Dermatitis, Contact / Female / Humans / Male / Materials Testing / Patch Tests (Link to Publication Site) ● Publication site (DOI): 10.3233/BME-2009-0563 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 19458446 ● Search Scopus @ Elsevier (PMID): 19458446 ● Search Scopus @ Elsevier (DOI): 10.3233/BME-2009-0563 (DOI: 10.3233/BME-2009-0563, PubMed: 19458446)
19.	Kenzo Asaoka and Kunimitsu Maejima : Hydrogen-related degradation of mechanical properties of titanium and titanium alloys, Journal of ASTM International, Vol.6, No.1, JAI101853, 2008. (Link to Publication Site) ● Publication site (DOI): 10.1520/JAI101853 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1520/JAI101853 (DOI: 10.1520/JAI101853)
20.	Ken'ichi Yokoyama, Toshio Ogawa, Katsutoshi Takashima, Kenzo Asaoka and Junichi Sakai : Hydrogen embrittlement of Ni-Ti superelastic alloy aged at room temperature after hydrogen charging, Materials Science and Engineering A, Vol.466, No.1-2, 106-113, 2007. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.msea.2007.02.102 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.msea.2007.02.102 (DOI: 10.1016/j.msea.2007.02.102)
21.	Ken'ichi Yokoyama, Toshio Ogawa, Atsushi Fujita, Kenzo Asaoka and Junichi Sakai : Fracture of Ni-Ti superelastic alloy under sustained tensile load in physiological saline solution containing hydrogen peroxide, Journal of Biomedical Materials Research. Part A, Vol.82A, No.3, 558-567, 2007. (Summary) The fracture of Ni-Ti superelastic alloy has been investigated by a sustained tensile-loading test in physiological saline solution containing hydrogen peroxide (0.15M NaCl + 0.3M H(2)O(2)). The fracture always occurs when the applied stress exceeds the critical stress for martensite transformation. In contrast, under a low applied stress, the fracture does not always occur within 1000 h. The fracture is probably mainly caused by localized corrosion associated with the preferential dissolution of nickel ions. In 0.3M H(2)O(2) solution without NaCl, the fracture does not occur even under a high applied stress. The results of the present study imply that one reason for the fracture of the Ni-Ti superelastic alloy in vivo is localized corrosion due to the synergistic effects of hydrogen peroxide and sodium chloride under applied stress. (Keyword) Alloys / Biocompatible Materials / Corrosion / hydrogen peroxide / Materials Testing / Nickel / Prosthesis Failure / Sodium Chloride / Tensile Strength / titanium (Link to Publication Site) ● Publication site (DOI): 10.1002/jbm.a.31173 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 17311316 ● Search Scopus @ Elsevier (PMID): 17311316 ● Search Scopus @ Elsevier (DOI): 10.1002/jbm.a.31173 (DOI: 10.1002/jbm.a.31173, PubMed: 17311316)
22.	Ken'ichi Yokoyama, Miho Tomita, Jun'ichi Sakai and Kenzo Asaoka : Hydrogen absorption and thermal desorption behaviors of Ni-Ti superelastic alloy subjected to sustained tensile-straining test with hydrogen charging, Scripta Materialia, Vol.57, No.5, 393-396, 2007. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.scriptamat.2007.05.002 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.scriptamat.2007.05.002 (DOI: 10.1016/j.scriptamat.2007.05.002)
23.	Kenzo Asaoka : Charactarization of titanium and its delayed fracture in vivo, The Journal of the Japanese Society for Dental Materials and Devices, Vol.26, No.4, 334-339, 2007. (Summary) Delayed fracture of medical Ti devices was studied by micro-mechanics. Effects of oxygen and hydrogen on the characterization of titanium were discussed in terms of macro and microscopic aspects. Hydrogen can have a major effect on the microstructure and properties of Ti. When the hydrogen concentration exceeds the terminal hydrogen solubility, a titanium hydride phase (TiH_2) can begin to form. Transformation from α-Ti to the hydride phase results in a volume expansion. Hydrides are formed along the grain boundary deeply in the surface. Micro-cracks are formed on the hydrides when an external force is applied. The cracks are developed and accelerate by the mechanism of stress-corrosion cracking related to hydrogen. Experimentally, we confirmed this by fatigue tests of pure Ti and by delayed fracture tests under sustained tensile loading in fluoride ion solutions. The results indicate that stress-corrosion cracking is an effective factor in delayed fracture of Ti. (Keyword) titanium / hydrogen / diffusion / crack / implant materials (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001204211712256 (CiNii: 1390001204211712256)
24.	Katsutoshi Takashima, Ken'ichi Yokoyama, Kenzo Asaoka and Junichi Sakai : Effects of potential on hydrogen absorption and desorption behaviors of titanium in neutral fluoride solutions, Journal of Alloys and Compounds, Vol.431, No.1-2, 203-207, 2007. (Keyword) titanium / corrosion / hydrogen embrittlement / fluoride / thermal desorption analysis / SODIUM-CHLORIDE SOLUTION / HIGH-STRENGTH STEELS / THERMAL-DESORPTION / DELAYED-FRACTURE / TRAPPING STATES / PD ALLOY / acid / SUSCEPTIBILITY / IRON (Link to Publication Site) ● Publication site (DOI): 10.1016/j.jallcom.2006.05.036 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.jallcom.2006.05.036 (DOI: 10.1016/j.jallcom.2006.05.036)
25.	Miho Tomita, Ken'ichi Yokoyama, Kenzo Asaoka and Jun'ichi Sakai : Hydrogen thermal desorption behavior of Ni-Ti superelastic alloy subjected to tensile deformation after hydrogen charging, Materials Science and Engineering A, Vol.476, No.1, 308-315, 2007. (Keyword) Ni-Ti / superelastic alloy / hydrogen embrittlement / thermal desorption analysis / HIGH-STRENGTH STEELS / shape memory alloys / DELAYED-FRACTURE / HYDROCHLORIC-ACID / TRAPPING STATES / TRANSFORMATION / EMBRITTLEMENT / SUSCEPTIBILITY / DEGRADATION / ABSORPTION (Link to Publication Site) ● Publication site (DOI): 10.1016/j.msea.2007.04.104 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.msea.2007.04.104 (DOI: 10.1016/j.msea.2007.04.104)
26.	Kenzo Asaoka : Effects of surface oxide films on hydrogen absorption and mechanical properties of titanium, Dentistry in Japan, Vol.43, No.0, 99-103, 2007. (Keyword) titanium / Corrosion / Strength / hydrogen / Oxide film (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1571980075537423104 (CiNii: 1571980075537423104)
27.	Yuki Sakamoto, Hidetaka Sezaki, Kenichi Yoshida and Kenzo Asaoka : Relationship between corrosion and mechanical strength of annealed titanium, Journal of Japanese Society for Dental Products, Vol.20, No.2, 3-13, 2006. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1574231875812769280 (CiNii: 1574231875812769280)
28.	Razia Sultana, Masayuki Kon, Mayumi Luciana Hirakata, Emi Fujiwara and Kenzo Asaoka : Surface modification of titanium with hydrothermal treatment at high pressure, Dental Materials Journal, Vol.25, No.3, 470-479, 2006. (Summary) Surface modification of titanium was investigated by means of hydrothermal treatment with a maximum pressure of 6.3 MPa (280 degrees C temperature) in CaO solution or water to improve bioactivity and biocompatibility. As a result, calcium titanate was formed on the titanium surface. Moreover, titanium oxide and titanium hydroxide layers on the surface increased as temperature and pressure increased. The surface-modified titanium was also immersed in a simulated body fluid (SBF) to estimate its bioactivity. Needle-like apatite precipitation was observed on all hydrothermal-treated titanium surfaces after immersion in SBF for four weeks. In particular, the apatite precipitation of titanium treated with 6.3 MPa in CaO solution was clearer and larger in amount than those of all other hydrothermal-treated specimens. Further, the amount of precipitate corresponded to the thickness of the surface-modified layer and the amount of calcium in the surface layer. The results suggested that surface modification of titanium with high-pressure hydrothermal treatment seemed to improve bioactivity and biocompatibility. (Keyword) Biocompatible Materials / Calcium Compounds / Dental Materials / Hot Temperature / Microscopy, Electron, Scanning / Oxides / pressure / surface properties / titanium / Water (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.25.470 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 17076316 ● Search Scopus @ Elsevier (PMID): 17076316 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.25.470 (DOI: 10.4012/dmj.25.470, PubMed: 17076316)
29.	Toshio Ogawa, Ken'ichi Yokoyama, Kenzo Asaoka and Jun'ichi Sakai : Effects of moisture and dissolved oxygen in methanol and ethanol solutions containing hydrochloric acid on hydrogen absorption and desorption behaviors of Ni-Ti superelastic alloy, Materials Science and Engineering A, Vol.422, No.1-2, 218-226, 2006. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.msea.2006.02.005 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.msea.2006.02.005 (DOI: 10.1016/j.msea.2006.02.005)
30.	Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka and Jun'ichi Sakai : Fracture of sustained tensile-loaded Ti-0.2% Pd alloy in acid and neutral fluoride solutions, Materials Science and Engineering A, Vol.419, No.1-2, 122-130, 2006. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.msea.2005.12.006 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.msea.2005.12.006 (DOI: 10.1016/j.msea.2005.12.006)
31.	Yuki Sakamoto, Kenzo Asaoka, Masayuki Kon, Toshio Matsubara and Kenichi Yoshida : Chemical surface modification of high-strength porous Ti compacts by spark plasma sintering, Bio-Medical Materials and Engineering, Vol.16, No.2, 83-91, 2006. (Summary) The biological properties of a titanium (Ti) implant depend on its surface oxide film. The aims of the present study were to increase the specific surface oxide area on Ti using a porous structure and to study the relationship between the amount of apatite coating in simulated body fluid (SBF) and the actual surface area on titanium powders. Ti powders of 110 microm average diameter were sintered by spark plasma sintering. The sintered compacts had a porosity of 28%, a compressive elastic modulus of 7.9 GPa and an ultimate strength of 112 MPa. The compressive strength of the compacts was increased to 588 MPa by subsequent annealing in a vacuum furnace at 1000 degrees C for 24 h. The sintered compacts were treated with aqueous NaOH solution and subsequently heated at 600 degrees C. The pretreated compacts showed apatite crystal precipitation in SBF. The amounts of precipitates through the compacts were compared with those of the Ti plate substrates subjected to the same chemical pretreatment. It was confirmed that the amounts of precipitates through the compacts were more than one hundred times higher than those on the Ti plates. It was concluded that the metal porous compacts developed may be used as functional materials for immobilizing functional proteins and/or drugs, because the precipitated apatite can adsorbed these substances. (Keyword) Apatites / Body Fluids / Coated Materials, Biocompatible / Compressive Strength / crystallization / Hot Temperature / Materials Testing / Metallurgy / Porosity / Powders / surface properties (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 16477117 ● Summary page in Scopus @ Elsevier: 2-s2.0-32444436281 (PubMed: 16477117, Elsevier: Scopus)
32.	Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka and Junichi Sakai : Hydrogen absorption of titanium and nickel-titanium alloys during long-term immersion in neutral fluoride solution, Journal of Biomedical Materials Research. Part B, Applied Biomaterials, Vol.78B, No.1, 204-210, 2006. (Summary) Hydrogen absorption of biomedical titanium and Ni-Ti alloys in a neutral fluoride (2.0% NaF) solution for up to 10,000 h at 37 degrees C has been evaluated by means of hydrogen thermal desorption analysis. For alpha titanium (commercial pure titanium), the amount of absorbed hydrogen was, at most, 10-30 mass ppm, and the corrosion product and hydride formation were revealed on the surface of the specimen by X-ray diffraction analysis. Ni-Ti superelastic alloy absorbed approximately 150 mass ppm of hydrogen, which was probably sufficient to result in the pronounced degradation of the mechanical properties, although corrosion was hardly observed. In contrast, hydrogen absorption of alpha-beta titanium (Ti-6Al-4V) and beta titanium (Ti-11.3Mo-6.6Zr-4.3Sn) alloys was negligible, although general corrosion was observed. The results of the present study indicate that the susceptibility of titanium and Ni-Ti alloys to hydrogen absorption in the neutral fluoride solution is different from that in the acidic fluoride solution reported previously. (Keyword) Biocompatible Materials / Fluorides / hydrogen / Nickel / titanium (Link to Publication Site) ● Publication site (DOI): 10.1002/jbm.b.30485 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 16362964 ● Summary page in Scopus @ Elsevier: 2-s2.0-33745684739 (DOI: 10.1002/jbm.b.30485, PubMed: 16362964, Elsevier: Scopus)
33.	Kenzo Asaoka and Kunimitsu Maejima : Effect of surface oxide films on degradation of titanium by thermal desorption spectroscopy, The Journal of the Japanese Society for Dental Materials and Devices, Vol.24, No.6, 439-445, 2005. (Keyword) titanium / Corrosion
34.	Masayuki Kon, Mayumi Luciana Hirakata, Youji Miyamoto, H Kasahara and Kenzo Asaoka : Strengthening of calcium phosphate cement by compounding calcium carbonate whiskers, Dental Materials Journal, Vol.24, No.1, 104-110, 2005. (Summary) The purpose of this study was to investigate how aragonite (calcium carbonate) whiskers influenced the strengthening and carbonating of alpha-tricalcium phosphate (alpha-TCP) based calcium phosphate cement. Aragonite whiskers of 0.95 microm width with an aspect ratio of 6.6 were prepared. The cement powder, alpha-TCP containing 0-50 mass% aragonite whisker, was mixed with 0.6 mol/L NaH2PO4 solution and incubated at 37 degrees C and 100% relative humidity. Diametral tensile strength (DTS) value increased significantly when appropriate amount of aragonaite whiskers was added. For example, DTS value of set cement containing 20 mass% aragonite whisker was 5.8 +/- 0.5 MPa, whereas DTS value of set cement containing no whiskers was 1.3 +/- 0.2 MPa after 1-week incubation. SEM observation revealed that the shape of the whiskers and the densification of the structure could have contributed to the strengthening of the set cement. Moreover, FTIR spectra implied that a bone-like carbonated apatite was precipitated in the cement. The results obtained in the present study revealed that the shape as well as any slight dissolution of aragonite whiskers could contribute to improving the properties of a-TCP based calcium phosphate cement. (Keyword) Apatites / Calcium Carbonate / Calcium Phosphates / Carbon / Crystallography, X-Ray / Dental Cements / Dental Stress Analysis / Materials Testing / Microscopy, Electron, Scanning / Spectroscopy, Fourier Transform Infrared / Tensile Strength (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.24.104 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 15881216 ● Summary page in Scopus @ Elsevier: 2-s2.0-20644468599 (DOI: 10.4012/dmj.24.104, PubMed: 15881216, Elsevier: Scopus)
35.	Toshio Ogawa, Ken'ichi Yokoyama, Kenzo Asaoka and Jun'ichi Sakai : Hydrogen embrittlement of Ni-Ti superelastic alloy in ethanol solution containing hydrochloric acid, Materials Science and Engineering A, Vol.393, No.1-2, 239-246, 2005. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.msea.2004.10.020 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.msea.2004.10.020 (DOI: 10.1016/j.msea.2004.10.020)
36.	Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka and Jun'ichi Sakai : Susceptibility to delayed fracture of alpha-beta titanium alloy in fluoride solutions, Corrosion Science, Vol.47, No.7, 1778-1793, 2005. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.corsci.2004.08.007 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1571417126448577408 ● Search Scopus @ Elsevier (DOI): 10.1016/j.corsci.2004.08.007 (DOI: 10.1016/j.corsci.2004.08.007, CiNii: 1571417126448577408)
37.	Toshio Ogawa, Ken'ichi Yokoyama, Kenzo Asaoka and Sakai Jun'ichi : Distribution and thermal desorption behavior of hydrogen in titanium alloys immersed in acidic fluoride solutions, Journal of Alloys and Compounds, Vol.396, No.1, 269-274, 2005. (Keyword) titanium / corrosion / hydrogen embrittlement / thermal desorption analysis / fluoride / TI SUPERELASTIC ALLOY / HIGH-STRENGTH STEELS / BETA-TITANIUM / HYDROCHLORIC-ACID / DELAYED-FRACTURE / TRAPPING STATES / PURE TITANIUM / EMBRITTLEMENT / ABSORPTION / spectroscopy (Link to Publication Site) ● Publication site (DOI): 10.1016/j.jallcom.2004.12.041 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.jallcom.2004.12.041 (DOI: 10.1016/j.jallcom.2004.12.041)
38.	Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka and Sakai Jun'ichi : Evaluation of hydrogen absorption properties of Ti-0.2 mass% Pd alloy in fluoride solutions, Journal of Alloys and Compounds, Vol.400, No.1-2, 227-233, 2005. (Keyword) Ti-Pd alloy / hydrogen embrittlement / corrosion / fluoride / CORROSION BEHAVIOR / CATHODIC POLARIZATION / HYDRIDE FORMATION / DELAYED FRACTURE / TITANIUM-ALLOYS / PURE TITANIUM / TI / EMBRITTLEMENT / RESISTANCE / GROWTH (Link to Publication Site) ● Publication site (DOI): 10.1016/j.jallcom.2005.03.048 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.jallcom.2005.03.048 (DOI: 10.1016/j.jallcom.2005.03.048)
39.	Ken'ichi Yokoyama, Kazuyuki Kaneko, Toshio Ogawa, Keiji Moriyama, Kenzo Asaoka and Jun'ichi Sakai : Hydrogen embrittlement of work-hardened Ni-Ti alloy in fluoride solutions., Biomaterials, Vol.26, No.1, 101-108, 2005. (Summary) Hydrogen embrittlement of work-hardened Ni-Ti alloy has been examined in acidulated phosphate fluoride (APF) solutions. Upon immersion in a 2.0% APF solution with a pH of 5.0, tensile strength decreased markedly with immersion time. Moreover, the fracture mode changed from ductile to brittle due to brittle layer formation at the peripheral part of the cross section of the specimen. The amount of absorbed hydrogen increased linearly with immersion time, and it reached above 5000 mass ppm after 24 h. The hydrogen desorption temperature of the immersed specimens shifted from 450 degrees C to a lower temperature with immersion time. As the amount of absorbed hydrogen was larger than 500 mass ppm, the degradation of mechanical properties was recognized. Although the tensile properties and fracture mode scarcely change in a 0.2% APF solution, the slight reduction in hardness and hydrogen absorption of several hundreds mass ppm were observed. The results of the present study imply that work-hardened Ni-Ti alloy is less sensitive to hydrogen embrittlement compared with Ni-Ti superelastic alloy. (Keyword) Absorption / Acidulated Phosphate Fluoride / Biocompatible Materials / Body Fluids / Corrosion / elasticity / Fluorides / Hardness / Hardness Tests / hydrogen / Materials Testing / Nickel / Orthodontic Wires / surface properties / Tensile Strength / titanium (Link to Publication Site) ● Publication site (DOI): 10.1016/j.biomaterials.2004.02.009 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 15193885 ● Search Scopus @ Elsevier (PMID): 15193885 ● Search Scopus @ Elsevier (DOI): 10.1016/j.biomaterials.2004.02.009 (DOI: 10.1016/j.biomaterials.2004.02.009, PubMed: 15193885)
40.	Ken'ichi Yokoyama, Toshio Ogawa and Kenzo Asaoka : Hydrogen absorption of titanium in acidic fluoride solutions, Materials Science and Engineering A, Vol.384, No.1-2, 19-25, 2004. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.msea.2004.05.059 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.msea.2004.05.059 (DOI: 10.1016/j.msea.2004.05.059)
41.	Kazuyuki Kaneko, Ken'ichi Yokoyama, Keiji Moriyama, Kenzo Asaoka and Jun'ichi Sakai : Degradation in performance of orthodontic wires caused by hydrogen absorption during short-term immersion in 2.0% acidulated phosphate fluoride solution., The Angle Orthodontist, Vol.74, No.4, 487-495, 2004. (Summary) The purpose of this study was to investigate the degradation in performance of four major alloys of orthodontic wires, namely nickel-titanium, beta titanium, stainless steel, and cobalt-chromium-nickel, caused by hydrogen absorption during short-term immersion in an acid fluoride solutions. The hydrogen-related degradation of orthodontic wires after immersion in 2.0% acidulated phosphate fluoride solution at 37 degrees C for 60 minutes was evaluated by a tensile test, scanning electron microscope observation, and hydrogen thermal desorption analysis. Upon immersion, the tensile strengths of the nickel-titanium and beta titanium wires decreased. Particularly, the nickel-titanium wire fractured before yielding, and the fracture mode changed from ductile to brittle. The amounts of absorbed hydrogen in the nickel-titanium and beta titanium wires were 200 and 100 mass ppm, respectively. On the other hand, the tensile strengths of the stainless steel and cobalt-chromium-nickel wires were only slightly affected by immersion. The results of this study suggest that degradation in performance of orthodontic wires of titanium alloys occurs because of hydrogen absorption even after a short-term immersion in fluoride solutions. (Keyword) Acidulated Phosphate Fluoride / Dental Alloys / Differential Thermal Analysis / Humans / hydrogen / Materials Testing / Microscopy, Electron, Scanning / Orthodontic Wires / Tensile Strength (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 15387026 ● Search Scopus @ Elsevier (PMID): 15387026 (PubMed: 15387026)
42.	Ken'ichi Yokoyama, Tatsuya Eguchi, Kenzo Asaoka and Michihiko Nagumo : Effects of constituting phases in Ni-Ti shape memory alloy on susceptibility to hydrogen embrittlement, Materials Science and Engineering A, Vol.374, No.1-2, 177-183, 2004. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.msea.2004.02.029 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.msea.2004.02.029 (DOI: 10.1016/j.msea.2004.02.029)
43.	Ken'ichi Yokoyama, Kazuyuki Kaneko, Keiji Moriyama, Kenzo Asaoka, Jun'ichi Sakai and Michihiko Nagumo : Delayed fracture of Ni-Ti superelastic alloys in acidic and neutral fluoride solutions., Journal of Biomedical Materials Research. Part A, Vol.69A, No.1, 105-113, 2004. (Summary) Hydrogen-related degradation of the mechanical properties of a Ni-Ti superelastic alloy has been examined by means of delayed fracture tests in acidic and neutral fluoride solutions and hydrogen thermal desorption analysis. Delayed fracture took place in both solutions; the time to fracture was shorter in the acidic solutions than in the neutral solutions with the same fluoride concentration. The time to fracture was reduced in both solutions when applied stress exceeded the critical stress for martensite transformation. In the acidic solutions, Ni-Ti superelastic alloy underwent general corrosion and absorbed substantial amounts of hydrogen. Fractographic features suggested that the delayed fracture in the acidic solutions was attributable to hydrogen embrittlement, whereas in the neutral solutions, a different fracture mode appeared associated with localized corrosion only in the vicinity of the fracture initiation area. In the neutral solutions, the amount of absorbed hydrogen was much less than that in the acidic solutions, and the delayed fracture was likely to be induced by active path corrosion accompanying hydrogen absorption. The results of the present study imply that the hydrogen-related degradation of performance of Ni-Ti superelastic alloys occurs in the presence of fluoride. (Keyword) Corrosion / electrochemistry / Fluorides / hydrogen / Hydrogen-Ion Concentration / Materials Testing / Microscopy, Electron, Scanning / Nickel / Solutions / Stress, Mechanical / Tensile Strength / titanium (Link to Publication Site) ● Publication site (DOI): 10.1002/jbm.a.20122 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 14999757 ● Search Scopus @ Elsevier (PMID): 14999757 ● Search Scopus @ Elsevier (DOI): 10.1002/jbm.a.20122 (DOI: 10.1002/jbm.a.20122, PubMed: 14999757)
44.	Ken'ichi Yokoyama, Kazuyuki Kaneko, Eiji Yabuta, Kenzo Asaoka and Jun'ichi Sakai : Fracture of nickel-titanium superelastic alloy in sodium hypochlorite solution, Materials Science and Engineering A, Vol.369, No.1-2, 43-48, 2004. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.msea.2003.10.320 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.msea.2003.10.320 (DOI: 10.1016/j.msea.2003.10.320)
45.	Masayuki Kon, Mayumi Luciana Hirakata and Kenzo Asaoka : Porous Ti-6Al-4V alloy fabricated by spark plasma sintering for biomimetic surface modification, Journal of Biomedical Materials Research. Part B, Applied Biomaterials, Vol.68B, No.1, 88-93, 2004. (Summary) Porous compacts with both biological and biomechanical compatibilities and high strength were developed. Spherical powders of Ti-6Al-4V alloy, which were either as received or surface modified with the use of calcium ions by hydrothermal treatment (HTT), were fabricated by a spark plasma sintering process. The porous compacts of pure Ti were used as reference materials. Porosity was approximately 30%, and compressive strengths were 113 and 125 MPa for the as-received Ti alloy powders and those modified by the HTT process, respectively. The bending strength and elastic modulus of as-received Ti alloy powders were 128-178 MPa and 16-18 GPa, respectively. Each of the compacts was immersed in simulated body fluid (SBF). The amount of adsorption/precipitation of calcium phosphate through the compacts was measured by weight change and was observed by SEM. The compacts were covered with calcium phosphate after 2 weeks of immersion in SBF. The compacts of Ti alloy had plenty of precipitated apatite crystals, and modification by HTT accumulated more precipitation. Because calcium phosphate is a mineral component of bone, apatite, which is precipitated on the surface of the compacts, could adsorb proteins and/or drugs such as antibiotics. It is expected that a large amount of proteins and/or drugs could be impregnated when the porous compacts developed are used. (Keyword) Apatites / Biocompatible Materials / Microscopy, Electron, Scanning / Time Factors / titanium (Link to Publication Site) ● Publication site (DOI): 10.1002/jbm.b.20004 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 14689501 ● Search Scopus @ Elsevier (PMID): 14689501 ● Search Scopus @ Elsevier (DOI): 10.1002/jbm.b.20004 (DOI: 10.1002/jbm.b.20004, PubMed: 14689501)
46.	Ken'ichi Yokoyama, Kazuyuki Kaneko, Youji Miyamoto, Kenzo Asaoka, Jun'ichi Sakai and Michihiko Nagumo : Fracture associated with hydrogen absorption of sustained tensile-loaded titanium in acid and neutral fluoride solutions, Journal of Biomedical Materials Research. Part A, Vol.68, No.1, 150-158, 2004. (Summary) The fracture of commercial pure titanium in acid and neutral fluoride solutions has been examined by a sustained tensile-loading test and hydrogen thermal desorption analysis. It was found that the fracture of titanium occurred in neutral 2.0% NaF solution as well as in 2.0% acidulated phosphate fluoride (APF) solution. The time to fracture decreased with increasing applied stress in both 2.0% APF and 2.0% NaF solutions. In the case of the same applied stress, the time to fracture in the 2.0% APF solution was shorter than that in the 2.0% NaF solution. General corrosion was exhibited on the side surface of the tested specimens. The formation of sodium titanium fluoride was observed on the surface of the immersed specimens in the 2.0% APF solution. Hydrogen desorption of the tested specimen in the 2.0% APF solution was observed with a peak at approximately 600 degrees C. The amount of absorbed hydrogen was >300 mass ppm in the 2.0% APF solution under an applied stress for 24 h. The results of the present study imply that applying stress to titanium by immersing in fluoride solutions leads to the degradation of its mechanical properties. (Keyword) titanium / fracture / hydrogen embrittlement / corrosion / fluoride / STRESS-CORROSION CRACKING / TI SUPERELASTIC ALLOY / PURE TITANIUM / CATHODIC POLARIZATION / HYDROCHLORIC-ACID / HYDRIDE FORMATION / HOLLOW IMPLANTS / EMBRITTLEMENT / RESISTANCE / BEHAVIOR (Link to Publication Site) ● Publication site (DOI): 10.1002/jbm.a.20067 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 14661260 ● Search Scopus @ Elsevier (PMID): 14661260 ● Search Scopus @ Elsevier (DOI): 10.1002/jbm.a.20067 (DOI: 10.1002/jbm.a.20067, PubMed: 14661260)
47.	Toshio Ogawa, Ken'ichi Yokoyama, Kenzo Asaoka and Jun'ichi Sakai : Hydrogen absorption behavior of beta titanium alloy in acid fluoride solutions, Biomaterials, Vol.25, No.12, 2419-2425, 2004. (Summary) Hydrogen absorption behavior of a beta titanium alloy in acid fluoride solutions has been analyzed by hydrogen thermal desorption. The amount of absorbed hydrogen increased with immersion time in a 2.0% acidulated phosphate fluoride (APF) solution. In the case of an immersion time of 60 h, the amount of absorbed hydrogen exceeded 10000 mass ppm. In contrast, the amount of hydrogen absorbed in the 0.2% APF solution was several times smaller than that in the 2.0% APF solution for the same immersion time. For immersion in a 0.2% APF solution, hydrogen absorption saturated after 48 h. The surface topography and corrosion products on the surface of the specimen immersed in the 2.0% APF solution were different from those in the 0.2% APF solution. During the later stage of immersion, the amount of absorbed hydrogen markedly increased under higher applied stress, although the applied stress did not enhance hydrogen absorption during the early stage of immersion. These results of hydrogen absorption behavior are consistent with the delayed fracture characteristics of the beta titanium alloy. (Keyword) Absorption / Acidulated Phosphate Fluoride / Biocompatible Materials / Corrosion / Dental Alloys / Hot Temperature / hydrogen / Materials Testing / Molecular Conformation / Orthodontic Wires / Solutions / surface properties / titanium (Link to Publication Site) ● Publication site (DOI): 10.1016/j.biomaterials.2003.09.006 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 14741607 ● CiNii @ National Institute of Informatics (CRID): 1571980076667151232 ● Search Scopus @ Elsevier (PMID): 14741607 ● Search Scopus @ Elsevier (DOI): 10.1016/j.biomaterials.2003.09.006 (DOI: 10.1016/j.biomaterials.2003.09.006, PubMed: 14741607, CiNii: 1571980076667151232)
48.	Kazuyuki Kaneko, Ken'ichi Yokoyama, Keiji Moriyama, Kenzo Asaoka, Jun'ichi Sakai and Michihiko Nagumo : Delayed fracture of beta titanium orthodontic wire in fluoride aqueous solutions., Biomaterials, Vol.24, No.12, 2113-2120, 2003. (Link to Publication Site) ● Publication site (DOI): 10.1016/S0142-9612(02)00642-7 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 12628832 ● CiNii @ National Institute of Informatics (CRID): 1573387451545704064 ● Search Scopus @ Elsevier (PMID): 12628832 ● Search Scopus @ Elsevier (DOI): 10.1016/S0142-9612(02)00642-7 (DOI: 10.1016/S0142-9612(02)00642-7, PubMed: 12628832, CiNii: 1573387451545704064)
49.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : Shape recovery of shape memory alloy fiber embedded resin matrix smart composite after crack repair, Dental Materials Journal, Vol.22, No.2, 160-167, 2003. (Summary) Ni-Ti shape memory alloy fiber embedded resin matrix composites were produced for evaluation of "smart denture", a newly developing denture with the function to close its own crack. Their bending strength and shape recovery after instant crack repair was estimated. The embedded fibers did not decrease the bending strength of the composite after repair. The crack closure of the composites was performed well simply by heating at 80 degrees C. Nevertheless, they showed apparent deflection after crack repair. The following two phenomena were supposed to be the main cause of it: the polymerization shrinkage of matrix resin with heating, and the coefficient of the thermal expansion mismatch between the fiber and the matrix. The embedded fibers could close the crack of the matrix with enough high accuracy for specimen repair, but they turned out to change the specimen shape after repair. (Keyword) Composite / Denture stomatitis / Repair (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.22.160 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 12873119 ● CiNii @ National Institute of Informatics (CRID): 1390001204717659136 ● Summary page in Scopus @ Elsevier: 2-s2.0-0141448733 (DOI: 10.4012/dmj.22.160, PubMed: 12873119, CiNii: 1390001204717659136, Elsevier: Scopus)
50.	Kenzo Asaoka and Susumu Hirano : Diffusion coefficient of water through dental composite resin, Biomaterials, Vol.24, No.6, 975-979, 2003. (Summary) Water sorption of polymer filling materials affects dimensional stability, mechanical properties and bonding strength with tooth structures. To clarify the effect of the degradation on service life and micro-leakage, the diffusion coefficient of water through the resin should be identified. Distributions of time-dependent water concentrations in the resin were computed. Water sorption of composite resin discs with different thicknesses was measured and compared with the solution of Fick's second law. The diffusion coefficient of water through the resin discs was computed to be D=3.9-5.0 x 10(-13)m(2)/s from the measurements of specimens with different thicknesses. Results of water sorption measurements for the discs with different thicknesses were in good agreement with the theoretical results. The relationship among the thickness of the disc, the diffusion coefficient and the water sorption ratio was shown clearly. The testing method for water sorption by International Standard ISO 4049 for resin-based filling materials was discussed. (Keyword) Composite Resins / diffusion / Kinetics / Time Factors / Water (Link to Publication Site) ● Publication site (DOI): 10.1016/S0142-9612(02)00435-0 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 12504519 ● Search Scopus @ Elsevier (PMID): 12504519 ● Search Scopus @ Elsevier (DOI): 10.1016/S0142-9612(02)00435-0 (DOI: 10.1016/S0142-9612(02)00435-0, PubMed: 12504519)
51.	Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka, Jun'ichi Sakai and Michihiko Nagumo : Degradation of tensile strength of Ni-Ti superelastic alloy due to hydrogen absorption in methanol solution containing hydrochloric acid, Materials Science and Engineering A, Vol.360, No.1-2, 153-159, 2003. (Keyword) Ni-Ti / hydrogen embrittlement / thermal desorption analysis / corrosion / methanol solution / STRESS-CORROSION CRACKING / shape memory alloys / titanium / EMBRITTLEMENT / environment / FRACTURE / BEHAVIOR / NITINOL / WIRE / HCL (Link to Publication Site) ● Publication site (DOI): 10.1016/S0921-5093(03)00403-9 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1572543026619345664 ● Summary page in Scopus @ Elsevier: 2-s2.0-0141907230 (DOI: 10.1016/S0921-5093(03)00403-9, CiNii: 1572543026619345664, Elsevier: Scopus)
52.	Ken'ichi Yokoyama, Shyozo Watabe, Kenichi Hamada, Jun'ichi Sakai, Kenzo Asaoka and Michihiko Nagumo : Susceptability to delayed fracture of Ni-Ti superelastic alloy, Materials Science and Engineering A, Vol.341, No.1-2, 91-97, 2003. (Link to Publication Site) ● Publication site (DOI): 10.1016/S0921-5093(02)00201-0 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1572543026611475328 ● Search Scopus @ Elsevier (DOI): 10.1016/S0921-5093(02)00201-0 (DOI: 10.1016/S0921-5093(02)00201-0, CiNii: 1572543026611475328)
53.	Mayumi Luciana Hirakata, Masayuki Kon and Kenzo Asaoka : Evaluation of apatite ceramics containing α-tricalcium phosphate by immersion in simulated body fluid, Bio-Medical Materials and Engineering, Vol.13, No.3, 247-259, 2003. (Summary) The purpose of this study was to estimate the availability of alpha-tricalcium phosphate (alpha-TCP) on/in hydroxyapatite (HAP) ceramics for bioactivity as bone-substitute materials by immersion in a simulated body fluid (SBF; Hanks' solution) containing ion concentrations similar to those in human blood plasma. Two alpha-TCP-surface-modified HAP and alpha-TCP-HAP composite materials were prepared by orthophosphoric acid treatment of sintered HAP and controlling the crystal phases of calcium phosphate cement, respectively. After immersion in SBF, the sintered HAP modified on the surface in an approximately 0.2 microm alpha-TCP layer was more effective for the precipitation of carbonated apatites than an approximately 2 microm alpha-TCP layer and HAP-only layer. In the calcium phosphate cements consisting of HAP and alpha-TCP phases, after immersion for 1 week, the specimens precipitated large amounts of apatites having alpha-TCP contents of approximately 25% and 50% in the cement. The results of immersion tests imply the possibility that the alpha-TCP on/in HAP ceramics may be a bioactive agent for bone-substituting HAP materials. (Keyword) Biomimetic Materials / Body Fluids / Bone Cements / Bone Substitutes / Calcium Phosphates / ceramics / Coated Materials, Biocompatible / Durapatite / Hot Temperature / Hydrogen-Ion Concentration / Immersion / Materials Testing / Molecular Conformation / surface properties (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 12883174 ● Search Scopus @ Elsevier (PMID): 12883174 (PubMed: 12883174)
54.	Ken'ichi Yokoyama, Kazuyuki Kaneko, Keiji Moriyama, Kenzo Asaoka, Jun'ichi Sakai and Michihiko Nagumo : Hydrogen embrittlement of Ni-Ti superelastic alloy in fluoride solution, Journal of Biomedical Materials Research, Vol.65A, No.2, 182-187, 2003. (Keyword) Ni-Ti / hydrogen embrittlement / fluoride / corrosion / NICKEL-TITANIUM ALLOY / shape memory alloys / SURFACE CHARACTERIZATION / CORROSION BEHAVIOR / FRACTURE / NITINOL / environment / WIRE / RESISTANCE / GROWTH (Link to Publication Site) ● Publication site (DOI): 10.1002/jbm.a.10457 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0141799744 (DOI: 10.1002/jbm.a.10457, Elsevier: Scopus)
55.	Takao Hanawa, S Hiromoto, K Asami, Osamu Okuno and Kenzo Asaoka : Surface oxide films on titanium alloys regenerated in Hanks' solution, Materials Transactions, Vol.43, No.12, 3000-3003, 2002. (Link to Publication Site) ● Publication site (DOI): 10.2320/matertrans.43.3000 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0036998699 (DOI: 10.2320/matertrans.43.3000, Elsevier: Scopus)
56.	Ken'ichi Yokoyama, Tetsuo Ichikawa, Hiroki Murakami, Youji Miyamoto and Kenzo Asaoka : Fracture mechanisms of retrieved titanium screw thread in dental implant, Biomaterials, Vol.23, No.12, 2456-2465, 2002. (Summary) Titanium and its alloy are increasingly attracting attention for use as biomaterials. However, delayed fracture of titanium dental implants has been reported, and factors affecting the acceleration of corrosion and fatigue have to be determined. The fractured surface of a retrieved titanium screw and metallurgical structures of a dental implant system were analyzed. The outer surface of the retrieved screw had a structure different from that of the as-received screw. It was confirmed that a shear crack initiated at the root of the thread and propagated into the inner section of the screw. Gas chromatography revealed that the retrieved screw had absorbed a higher amount of hydrogen than the as-received sample. The grain structure of a titanium screw, immersed in a solution known to induce hydrogen absorption, showed features similar to those of the retrieved screw. It was concluded that titanium in a biological environment absorbs hydrogen and this may be the reason for delayed fracture of a titanium implant. (Keyword) titanium / dental implant / delayed fracture / metallurgical structure / environmental corrosion / shear crack / hydrogen / RECONSTRUCTION / CORROSION / FAILURE / PLATES / alloy / light (Link to Publication Site) ● Publication site (DOI): 10.1016/S0142-9612(01)00380-5 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 12033593 ● CiNii @ National Institute of Informatics (CRID): 1571417126701142016 ● Search Scopus @ Elsevier (PMID): 12033593 ● Search Scopus @ Elsevier (DOI): 10.1016/S0142-9612(01)00380-5 (DOI: 10.1016/S0142-9612(01)00380-5, PubMed: 12033593, CiNii: 1571417126701142016)
57.	Masayuki Kon, Hirakata Mayumi Luciana, Youji Miyamoto, Fumiaki Kawano and Kenzo Asaoka : Surface-layer modification of hydroxyapatite ceramic with acid and heat treatments, Dental Materials Journal, Vol.21, No.2, 170-180, 2002. (Summary) The purpose of this study was to examine or characterize the surface layer of a calcium phosphate ceramic with a gradual compositional change from alpha-tricalcium phosphate (alpha-TCP) on the surface to hydroxyapatite (HAP) on the inside. The surface of a dense HAP ceramic was acid-treated for 1 hour with orthophosphoric acid (H3PO4) solutions of several concentrations (0.5, 1.0 and 5.0 mol/L) or a buffered solution (pH 4.0) consisting of phosphate solutions. After acid treatment, specimens were heat-treated at 1,250 degrees C for 1 hour. X-ray photoelectron spectroscopy revealed that the compositional gradient layer could be modified on the surface of the HAP ceramic with all acid and heat treatments, and that 5.0 mol/L H3PO4 solution and heat treatments had a maximal thickness of approximately 2 microm for the surface-modified layer. It was confirmed that the outermost layer of HAP ceramics modified with the treatments, except 5.0 mol/L H3PO4 solution, showed a compound such alpha-TCP. (Keyword) Apatite ceramic / Surface treatment / α-Tricalcium phosphate (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.21.170 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 12238785 ● CiNii @ National Institute of Informatics (CRID): 1390282679692695424 ● Search Scopus @ Elsevier (PMID): 12238785 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.21.170 (DOI: 10.4012/dmj.21.170, PubMed: 12238785, CiNii: 1390282679692695424)
58.	Kenichi Hamada, Masayuki Kon, Takao Hanawa, Ken'ichi Yokoyama, Youji Miyamoto and Kenzo Asaoka : Hydrothermal modification of titanium surface in calcium solutions, Biomaterials, Vol.23, No.10, 2265-2272, 2002. (Summary) Hydrothermal modification of a titanium surface in calcium solutions was performed. The apatite precipitation on the modified surface in Hanks' solution, as a simulated body fluid, was evaluated and the surface microstructure changes after the modification were characterized by thin-film X-ray diffractometry (TF-XRD) and X-ray photoelectron spectroscopy (XPS). Hydrothermal modification in CaO solution enhanced the precipitation of apatite on the titanium surface. High pH, high pressure and high temperature of the CaO solution increased the thickness of the surface-modified layer and enhanced the synthesis of calcium titanate which possibly promoted the precipitation of apatite in Hanks' solution. Hydrothermal modification in CaCl2 solution, on the other hand, showed reverse effects. The modification of titanium in CaO solution with hydrothermal treatment is expected to result in excellent osteointegration and can be easily performed by using an autoclave, a clinical apparatus widely used. (Keyword) Apatites / Body Fluids / Bone and Bones / calcium / Calcium Chloride / Chemical Precipitation / Electron Probe Microanalysis / Hydrogen-Ion Concentration / Microscopy, Electron, Scanning / Models, Chemical / Oxygen / pressure / temperature / titanium / Water / X-ray diffraction (Link to Publication Site) ● Publication site (DOI): 10.1016/S0142-9612(01)00361-1 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 11962668 ● Search Scopus @ Elsevier (PMID): 11962668 ● Search Scopus @ Elsevier (DOI): 10.1016/S0142-9612(01)00361-1 (DOI: 10.1016/S0142-9612(01)00361-1, PubMed: 11962668)
59.	Kenzo Asaoka, Ken'ichi Yokoyama and M Nagumo : Hydrogen embrittlements of nickel-titanium alloy in biological environment, Metallurgical and Materials Transactions A, Vol.33A, No.March, 495-501, 2002. (Link to Publication Site) ● Publication site (DOI): 10.1007/s11661-002-0111-8 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s11661-002-0111-8 (DOI: 10.1007/s11661-002-0111-8)
60.	Masayuki Kon, J W O'Brien, T S Rasmussen and Kenzo Asaoka : Mechanical properties of glass-only porcelains prepared using two feldspathic-frits with different thermal properties, Journal of Dental Research, Vol.80, No.8, 1758-1763, 2001. (Summary) Low- and non-leucite-containing commercial porcelains with low firing temperatures have become popular. However, improving the strength of glass porcelains is difficult. The purpose of this study was to determine if dispersed glass particles could be used as a reinforcing agent for an all-glass porcelain. We produced 3 feldspathic glasses (high-fusing, medium-fusing, low-fusing) by melting powders consisting of potassium-feldspar and 0, 5, or 20 mass% Na2O, respectively. For high-fusing, medium-fusing, and low-fusing feldspathic glasses, the deformation temperatures were 945 degrees C, 647 degrees C, and 518 degrees C, and the thermal expansion coefficient values were 8.6 x 10(-6)/degrees C, 10.3 x 10(-6)/degrees C, and 13.4 x 10(-6)/degrees C between 25 degrees C and the glass-transition temperature, respectively. The high-fusing-glass (or medium-fusing-glass) powders were mixed with low-fusing-glass powders before being fired into test specimens. The mean flexural strength and fracture toughness (K1C) of 3 single-glass porcelains ranged from 57 to 63 MPa and from 0.68 to 0.73 MPa m(1/2), respectively, presenting no significant differences in one-way ANOVA. However, the flexural strength of 50% high-fusing-glass + 50% low-fusing-glass porcelain was 114 MPa (p < 0.05) and K1C was 1.2 MPa m(1/2) (p < 0.05). Microcracks were observed with a back-scattered scanning electron microscope and were associated with the high- (or medium-) fusing glass particles, suggesting residual stress in the low-fusing-glass matrix due to a coefficient of thermal expansion mismatch between the dispersed glass particles and the matrix glass. The dispersing glass particles appeared to act as a reinforcing agent for strengthening a glassy porcelain. (Keyword) Aluminum Silicates / analysis of variance / Dental Porcelain / Glass / Hot Temperature / Humans / Materials Testing / Microscopy, Electron, Scanning / Oxides / Pliability / potassium / Potassium Compounds / Powders / Sodium Compounds / Stress, Mechanical / surface properties / thermodynamics (Link to Publication Site) ● Publication site (DOI): 10.1177/00220345010800081501 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 11669489 ● Search Scopus @ Elsevier (PMID): 11669489 ● Search Scopus @ Elsevier (DOI): 10.1177/00220345010800081501 (DOI: 10.1177/00220345010800081501, PubMed: 11669489)
61.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : Material Design of Denture Base Resin Reinforced by Shape Memory Alloy Fiber, The Journal of the Japanese Society for Dental Materials and Devices, Vol.20, No.2, 131-135, 2001. (Summary) We evaluated the tensile strength of denture base resin reinforced by shape memory alloy fiber. Fiber surface treatment with primer decreased the fiber-pull-out in a shape-memory-fiber reinforced denture base resin matrix composite and increased the tensile strength. We speculated that the increase in tensile strength was caused by an increase in interfacial strength between the fiber and the matrix. Since heat treatment at above 60℃ increased the composite tensile strength, this composite worked as a smartcomposite. Although there was no effect of heat treatment temperature on tensile strength, flexion of composite was observed after heat treatment at a higher temperature, suggesting that the heat treatment temperature should be lower. We speculated that the slight increase in tensile strength after heat treatment was caused by the higher martensite transformation starting temperature of the fiber. (Keyword) Composite materials / Shape memory ally / Fiber reinforced material / Denture base resin / Tensile strength / Primer / Smart composite (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282763026533888 (CiNii: 1390282763026533888)
62.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化床用レジンの損傷修復, The Journal of the Japanese Society for Dental Materials and Devices, Vol.20, No.2, 145-151, 2001.
63.	Ken'ichi Yokoyama, Kenichi Hamada, Keiji Moriyama and Kenzo Asaoka : Degradation and fracture of Ni-Ti superelastic wire in an oral cavity, Biomaterials, Vol.22, No.16, 2257-2262, 2001. (Link to Publication Site) ● Publication site (DOI): 10.1016/S0142-9612(00)00414-2 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0035882635 (DOI: 10.1016/S0142-9612(00)00414-2, Elsevier: Scopus)
64.	M Kobayashi, Masayuki Kon, K Miyai and Kenzo Asaoka : Strengthening of glass-ionomer cement by compounding short fibres with CaO-P2O5-SiO2-Al2O3 glass., Biomaterials, Vol.21, No.20, 2051-2058, 2000. (Summary) The purpose of this study was to determine if short fibres of CaO-P2O5-SiO2-Al2O3 (CPSA) glass possessing a particular aspect ratio (length/diameter) could be used as a reinforcing agent for glass-ionomer cement. The powder of a commercial glass-ionomer cement (not resin modified) was mixed with variously sized CPSA glass short fibres before mixing with the liquid of the glass-ionomer cement. The mixed powders containing 60 mass% CPSA glass short fibres (diameter, 9.7 +/- 2.1 microm, aspect ratio, 5.0 +/- 0.9) obtained maximum values of 18 and 35 MPa for the diametral tensile strength (DTS) and flexural strength (FS) of set cements, respectively, after 24 h. These DTS and FS values were 1.8 and 4.5 times larger, respectively, than those of the set glass-ionomer cement not containing short fibres. Moreover, it was found that the addition of CPSA glass short fibres was remarkably more effective in the strengthening than electric glass (a typical glass fibre) short fibres. The results suggested that the CPSA glass short fibres acted as a reinforcing agent for strengthening the glass-ionomer cement, because of the shape of short fibres and reactivity between the mixing liquid and short fibres. (Keyword) Dental Cements / Glass / Microscopy, Electron, Scanning (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 10966014 ● Search Scopus @ Elsevier (PMID): 10966014 (PubMed: 10966014)
65.	Ken'ichi Yokoyama, Kenichi Hamada and Kenzo Asaoka : Fracture analysis of hydrogen-charged nickel-titanium super alloy, Materials Transactions, Vol.42, No.1, 141-144, 2000.
66.	Kenzo Asaoka, Kenichi Yoshida, Kenichi Hamada and Masayuki Kon : Acoustic emission and thermal expansion measurements for gypsum-bonded investment in casting flask during thermal processing, Dentistry in Japan, Vol.35, No.3, 89-93, 1999. (Summary) 本論文は，石膏結合された埋没材および鋳型リングで拘束された同じ埋没材を用いて，加熱/冷却中のAEが計測され，AE活動度は250°Cと300°Cで高くなり，鋳型リングで拘束されれば更に活発になることが明らかになり，計算された熱応力の発生と鋳型リング拘束されたときの熱膨張率の変化とを比較した結果，AEの発生源は石膏の局部割れによるものであり，検出されたこれらの破壊は鋳型の精度を損ない歪みの原因になることを明らかにした．
67.	Hae-Hyoung Lee, Masayuki Kon and Kenzo Asaoka : Fracture toughness and durability of chemically or thermally tempered metal-ceramic porcelain, Bio-Medical Materials and Engineering, Vol.9, No.3, 135-143, 1999. (Summary) Thermocycling and water storage effects on fracture toughness (KIC) of chemically or thermally tempered metal-ceramic disks were investigated to evaluate the durability of tempering effects with regard to oral aqueous environment. Metal-ceramic disks (phi 10 mm x 2.0 mm) consisting of opaque porcelain (0.2 mm thick), body porcelain (1.3 mm) and Ni-Cr-Be alloy (0.5 mm) were prepared and the porcelain surfaces were polished with 1-micron diamond paste. The disks were subjected to ion exchange (potassium or rubidium) or thermal tempering treatments, then with the as-polished or further annealed disks, thermocycled for 8000, 15,000, and 22,000 cycles between 5 degrees C and 60 degrees C or stored in water at 37 degrees C for 33 days. After aging, KIC values of disks were determined by a Vickers indentation technique. Statistical analyses indicated that the KIC values of ion-exchanged and annealed disks were not significantly affected by the limited number of cycles and water storage, while the thermally tempered and untreated disks revealed a significant decrease in mean KIC from even 8000 cycles and after storage. However, there was no significant difference between thermocycling and water-storage effects on mean KIC of all surface treatment groups. Results indicate that chemical tempering (ion exchange) produced more durable residual stresses than does thermal tempering for metal-ceramic restorations. A low-thermal load only was unlikely to affect the apparent fracture toughness of porcelain. (Keyword) Chromium Alloys / Dental Porcelain / Equipment Failure / Equipment Failure Analysis / Hot Temperature / ion exchange / Materials Testing / Metal Ceramic Alloys / Metals / Microscopy, Electron, Scanning / Models, Theoretical / Stress, Mechanical / surface properties / Water (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 10572617 ● Search Scopus @ Elsevier (PMID): 10572617 (PubMed: 10572617)
68.	Mikiko Watarai, Takao Hanawa, Keiji Moriyama and Kenzo Asaoka : Amount of metallic ions released from Ti-Ni alloy by abrasion in simulated bioliquids, Bio-Medical Materials and Engineering, Vol.9, No.2, 73-79, 1999. (Summary) The current density of Ti-56mass%Ni (Ti-50at.%) alloy after abrasion in simulated bioliquids was measured using a potentiostat to estimate the amount of metallic ions released from the alloy during repassivation and maturation. The current density in saline, saline with and without N2 bubbling, and Hanks' solutions with and without proteins after abrasion was measured and the amount of released ion was calculated from the integrated current density with time, assuming that Ti4+ and Ni2+ are equivalently released. No difference in the amount of released ion was observed between saline with and without N2 bubbling. Also, no difference was observed between saline and pH 7.4 Hanks' solution. More Ti4+ and Ni2+ were released in bioliquids with proteins than in saline with and without N2 bubbling (p < 0.05). That is, dissolved oxygen and inorganic ions in Hanks' solution did not influence the amount of released ion, but proteins influenced it. The release of metallic ions from metals and alloys in biological systems can be estimated by the methodology employed in this study. (Keyword) Alloys / Biocompatible Materials / heavy ions / Hydrogen-Ion Concentration / Materials Testing / Models, Chemical / Nickel / nitrogen / Oxygen / Sodium Chloride / Solutions / surface properties / titanium (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 10524290 ● Search Scopus @ Elsevier (PMID): 10524290 (PubMed: 10524290)
69.	Masaaki Takechi, Youji Miyamoto, Kunio Ishikawa, Masaru Nagayama, Masayuki Kon, Kenzo Asaoka and Kazuomi Suzuki : Effects of added antibiotics on the basic properties of anti-washout-type fast-setting calcium phosphate cements, Journal of Biomedical Materials Research, Vol.39, No.2, 308-316, 1998.
70.	Takao Hanawa, Katsuhiko Asami and Kenzo Asaoka : Repassivation of titanium and surface oxide film regenerated in simulated bioliquid, Journal of Biomedical Materials Research, Vol.40, No.4, 530-538, 1998. (Summary) The change in potential during repassivation of titanium in artificial bioliquids was examined, and the regenerated surface oxide film on titanium was characterized using X-ray photoelectron spectroscopy and Auger electron spectroscopy to elucidate the repassivation reaction of titanium in a biological system. The repassivation rate in Hanks' solution was slower than that in saline and was not influenced by the pH of the solution. This indicates that more titanium ions dissolve in a biological system than hitherto was predicted when the surface film is destroyed. Phosphate ions are taken up preferentially in the surface film during regeneration, and the film consists of titanium oxide and titanium oxyhydroxide containing titanium phosphate. Calcium ions and phosphate ions are adsorbed by the film after regeneration, and calcium phosphate or calcium titanium phosphate is formed at the outermost surface. Ions constituting Hanks' solution other than calcium and phosphate were absent from the surface oxide. (Keyword) Biocompatible Materials / Body Fluids / electrochemistry / Electron Probe Microanalysis / Isotonic Solutions / Kinetics / Oxides / Sodium Chloride / surface properties / titanium (Link to Publication Site) ● Publication site (DOI): 10.1002/(SICI)1097-4636(19980615)40:4<530::AID-JBM3>3.0.CO;2-G (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 9599028 ● Search Scopus @ Elsevier (PMID): 9599028 ● Search Scopus @ Elsevier (DOI): 10.1002/(SICI)1097-4636(19980615)40:4<530::AID-JBM3>3.0.CO;2-G (DOI: 10.1002/(SICI)1097-4636(19980615)40:4<530::AID-JBM3>3.0.CO;2-G, PubMed: 9599028)
71.	Hae-Hyoung Lee, Masayuki Kon and Kenzo Asaoka : Mechanical properties of porcelain containing leucite ion exchanged with rubidium, Dental Materials Journal, Vol.17, No.2, 93-103, 1998. (Summary) The purpose of this study was to investigate the effectiveness of leucite crystals ion-exchanged with rubidium on the mechanical properties of glassy properties of glassy porcelain. For ion-exchange, a mixture of high-pure natural leucite (KAlSi_2O_6) powder and RbNO_3 were heat-treated at 450℃ (RLa) or 650℃ (RLb) for 1 four. The density of leucite increased as a result of the rubidium ion-exchange treatment. Polymorphic transformation temperatures of the ion-exchanged leucites were low compared with the unmodified leucite. Composite porcelains were prepared by blending each leucite (30 vol%) with "Component No.3" frit of Weinstein et al. patent. The flexural strength and fracture toughness of the glass-only and composite porcelains were measured by a three-point bending test and indentation technique. ANOVA and post hoc multiple comparisons test revealed that the flexural strength and fracture toughness of the composite porcelain containing RLa were signigicantly higher (p<.05 and p<.01, respectively) than those of the other groups. The results suggested that the rubidium-ion-exchanged leucite (RLa) could be a better reinforcing agent for dental porcelain. (Keyword) Dental porcelain / Rubidium leucite / Mechanical property (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.17.93 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001204715101312 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.17.93 (DOI: 10.4012/dmj.17.93, CiNii: 1390001204715101312)
72.	Hae-Hyoung Lee, Masayuki Kon, Takao Hanawa, Kenzo Asaoka, Fumiaki Kawano and Naoyuki Matsumoto : Influence of the thermocycling in water on ion-exchanged porcelain, Journal of Esthetic Dentistry, Vol.10, No.2, 201-206, 1998. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1573668924433713152 (CiNii: 1573668924433713152)
73.	Kyo-Han Kim, Kenzo Asaoka and Kenichi Yoshida : Acoustic emission signals from gypsum-bonded dental casting molds during thermal processing, Dental Materials Journal, Vol.17, No.1, 11-20, 1998. (Summary) To develop a suitable heating program for the investments which affect the casting accuracy/defects of prostheses, a probable microstructural change of the gypsum-bonded investments related to the transition of refractory particles during thermal processing was inspected by the measurement of acoustic emission (AE) signals. Gypsum-bonded cristobalite and quartz investment molds were used. AE measurements were carried out for the specimens in an electric furnace that was heated/cooled at a constant rate. For the heating process of the cristobalite investment, high AE activities were detected in the temperature range where the cristobalite was transformed. However, the AE signals detected were low for the second run of the heating and cooling processes. Even in the heating process, significant AE signals were not detected for the quartz investment. For cristobalite investment molds, micro-cracks are initiated and developed in relation to the transition of cristobalite particles in the mold. This leads to deterioration of the mechanical properties of the cristobalite investment at high temperatures (melt-pouring), and may affect the fitness of cast prostheses. (Keyword) Acoustics / Calcium Sulfate / Dental Casting Investment / Hot Temperature / Microscopy, Electron, Scanning / Quartz / Silicon Dioxide (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.17.11 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 9663058 ● Search Scopus @ Elsevier (PMID): 9663058 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.17.11 (DOI: 10.4012/dmj.17.11, PubMed: 9663058)
74.	Fumiaki Kawano, Takao Hanawa, Kenji Oka, Yoritoki Tomotake, Kenzo Asaoka, Tetsuo Ichikawa and Naoyuki Matsumoto : Estimation of residual stress in dental porcelain by Laser-Raman spectroscopy, Dental Materials Journal, Vol.17, No.1, 41-50, 1998. (Keyword) Dental porcelain / Residual stress / Laser-Raman spectroscopy
75.	Takao Hanawa, Masayuki Kon, Hisashi Doi, Hidemi Ukai, Kouichi Murakami, Hitoshi Hamanaka and Kenzo Asaoka : Amount of hydroxyl radical on calcium-ion-implanted titanium and point of zero charge of constituent oxide of the surface-modified layer, Journal of Materials Science. Materials in Medicine, Vol.9, No.2, 89-92, 1998. (Summary) To compare the surface properties of calcium-ion (Ca2+)-implanted titanium with those of titanium and to investigate the mechanism of bone conductivity of Ca2+-implanted titanium, amounts of hydroxyl radical of Ca2+-implanted titanium and titanium were estimated. Also, the point of zero charge (p.z.c.) of oxide constituting surface oxides of Ca2+-implanted titanium and titanium was determined. Results showed that the amount of active hydroxyl radical on Ca2+-implanted titanium was found to be significantly larger than that on titanium, indicating that the number of electric-charging sites of Ca2+-implanted titanium in electrolyte is more than that of titanium. The p.z.c. values of rutile (TiO2), anatase (TiO2), and perovskite (CaTiO3), were estimated to be 4.6, 5.9, and 8.1, respectively. Thus, Ca2+-implanted titanium surface is charged more positively in bioliquid than titanium, accelerating the adsorption of phosphate ions. (Link to Publication Site) ● Publication site (DOI): 10.1023/A:1008847014938 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 15348913 ● Search Scopus @ Elsevier (PMID): 15348913 ● Search Scopus @ Elsevier (DOI): 10.1023/A:1008847014938 (DOI: 10.1023/A:1008847014938, PubMed: 15348913)
76.	Masayuki Kon, Youji Miyamoto, Kenzo Asaoka, Kunio Ishikiawa and Hae-Hyoung Lee : Development of calcium phosphate cement for rapid crystallization to apatite, Dental Materials Journal, Vol.17, No.4, 223-232, 1998.
77.	Takao Hanawa, Masayuki Kon, Hidemi Ukai, Kouichi Murakami, Youji Miyamoto and Kenzo Asaoka : Surface modification of titanium in calcium-ion-containing solutions, Journal of Biomedical Materials Research, Vol.34, No.3, 273-278, 1997.
78.	Kunio Ishikiawa, Youji Miyamoto, Masaaki Takechi, Taketomo Toh, Masayuki Kon, Masaru Nagayama and Kenzo Asaoka : Non-decay type fast-setting calcium phosphate cement: Hydroxyapatite putty containing an increased amount of sodium alginate, Journal of Biomedical Materials Research, Vol.36, No.3, 393-399, 1997.
79.	Hae-Hyoung Lee, Masayuki Kon and Kenzo Asaoka : Influence of modification of Na2O in a glass matrix on the strength of leucite-containing porcelains, Dental Materials Journal, Vol.16, No.2, 134-143, 1997. (Summary) The desirable thermal properties of matrix glass to the strength of feldspar porcelain with leucite crystal were investigated. Five kinds of feldspar glasses, each with different a content of Na2O, were prepared for the matrix glasses of the leucite-containing porcelains. The specimens were arranged by mixing each glass powder with high-purity natural leucite crystals (0, 20 and 40%) followed by firing. The thermal properties of the glass and the transformation temperature of the leucite were measured. A three-point bending test was performed to measure the flexural strength of the porcelains. The glass transition temperature and deformation temperature of the glass-only porcelains were decreased as the Na2O content increased. The Na2O-modified glasses were substantially strengthened by the leucite dispersion. However, the strength of the porcelains was affected by the relation between the transformation temperature of the leucite and the thermal properties of the glass matrix. It was concluded that control of the residual stress in the composite porcelain is an important factor in developing high strength porcelain containing leucite. (Keyword) Aluminum Silicates / Dental Porcelain / Differential Thermal Analysis / Glass / Microscopy, Electron, Scanning / Oxides / Potassium Compounds / Sodium Compounds / surface properties / temperature / Tensile Strength / X-ray diffraction (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.16.134 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 9555252 ● Search Scopus @ Elsevier (PMID): 9555252 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.16.134 (DOI: 10.4012/dmj.16.134, PubMed: 9555252)
80.	Takao Hanawa, Yohji Kamiura, Satoru Yamamoto, Takao Kohgo, Akira Amemiya, Hidemi Ukai, Kouichi Murakami and Kenzo Asaoka : Early bone formation around calcium-ion-implanted titanium inserted into rat tibia, Journal of Biomedical Materials Research, Vol.36, No.1, 131-136, 1997. (Summary) Rat tibia tissue into which calcium ion (Ca2+)-implanted titanium was surgically placed was histologically analyzed to investigate the performance of the Ca(2+)-implanted titanium as a biomaterial. Calcium ions were implanted into only one side of titanium plates at 10(17) ions/cm2 and the Ca(2+)-treated titanium was surgically implanted into rat tibia for 2, 8, and 18 days. Tetracycline and calcein were used as hard-tissue labels. After excision of the tibia, the tissues were fixed, stained, embedded in polymethyl methacrylate, and sliced. The specimens were observed using a fluorescence microscope. A larger amount of new bone was formed on the Ca(2+)-treated side than on the untreated side, even at 2 days after surgery. In addition, part of the bone made contact with the Ca2(+)-treated surface. On the other hand, bone formation on the untreated side was delayed and the bone did not make contact with the surface. Mature bone with bone marrow formed in 8 days. Neither macrophage nor inflammatory cell infiltration was observed. The results indicated that Ca(2+)-implanted titanium is superior to titanium alone for bone conduction. (Keyword) Animals / Biocompatible Materials / calcium / Male / Materials Testing / Microscopy, Fluorescence / Osseointegration / Osteogenesis / Prostheses and Implants / Rats / Rats, Wistar / surface properties / Tibia / Time Factors / titanium (Link to Publication Site) ● Publication site (DOI): 10.1002/(SICI)1097-4636(199707)36:1<131::AID-JBM16>3.0.CO;2-L (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 9212398 ● Search Scopus @ Elsevier (PMID): 9212398 ● Search Scopus @ Elsevier (DOI): 10.1002/(SICI)1097-4636(199707)36:1<131::AID-JBM16>3.0.CO;2-L (DOI: 10.1002/(SICI)1097-4636(199707)36:1<131::AID-JBM16>3.0.CO;2-L, PubMed: 9212398)
81.	Kenzo Asaoka : Thermal diffusivity and specific heat of dental casting alloys at room and elevated temperatures, Dental Materials Journal, Vol.16, No.1, 78-86, 1997. (Summary) Thermal diffusivity and specific heat of four groups of dental casting alloys (Ag-based, Au-Pd, high karat and Ni-based alloys) were determined. Measurements were carried out from room temperature to 750 degrees C in an evacuated electric furnace with a laser flash thermal constant analyzer. There was no significant difference between the values of thermal diffusivity in the Ag-based and high karat alloys; 18-24 and 40-53 mm2/s, at room temperature and at 600 degrees C, respectively. For Au-Pd and Ni-based alloys, diffusivity was 8-12 and 3-4 mm2/s at room temperature, and 19-22 and 5-6 mm2/s at 600 degrees C, respectively. The thermal diffusivity of the alloys was significantly low compared to that of the pure-metals of which they were composed. Specific heat was determined as 0.14-0.16, 0.24-0.34, 0.17-0.19 and 0.45-0.51 kJ/(kg.K) for high karat, Ag-based, Au-Pd and Ni-based alloys, respectively, at room temperature. Oxidation of the Ni-based alloy at elevated temperature affected the value of specific heat measured. (Keyword) Dental Alloys / Gold Alloys / Hot Temperature / Lasers / Materials Testing / Nickel / Silver / Thermal Conductivity / thermodynamics (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.16.78 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 9550004 ● Search Scopus @ Elsevier (PMID): 9550004 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.16.78 (DOI: 10.4012/dmj.16.78, PubMed: 9550004)
82.	Kunio Ishikawa, Youji Miyamoto, Masaru Nagayama and Kenzo Asaoka : Blast coating method: New method of coating titanium surface with hydroxyapatite at room temperature, Journal of Biomedical Materials Research, Vol.38, No.2, 129-134, 1997.
83.	浦山明久, Takao Hanawa, Hideaki Nakae, Takashi Matsuo and Kenzo Asaoka : Microbial Properties of Titanium and Its Alloys for Oral Bacterium S. mutans, Journal of the Japan Institute Metals, Vol.61, No.6, 471-474, 1997. (Keyword) titanium / titanium alloy / oral bacteria / bacterial adhesion / antibacterial property
84.	Youji Miyamoto, Kunio Ishikawa, Masaaki Takechi, Taketomo Toh, Yuki Yoshida, Masaru Nagayama, Masayuki Kon and Kenzo Asaoka : Tissue response to fast-setting calcium phosphate cement in bone, Journal of Biomedical Materials Research, Vol.37, No.4, 457-464, 1997.
85.	T Murata, Kunio Ishikawa, S Tensin, Shinya Horiuchi, M Nakanishi, Kenzo Asaoka, Terushige Kawata and TT Yamamoto : Fluoridation of hydroxyapatite powder by ammonium hexafluosilicate, Caries Research, Vol.30, No.6, 501-507, 1996.
86.	Takao Hanawa, Katsuhiko Asami and Kenzo Asaoka : AES studies on dissolution of surface oxide from calcium-ion-implanted titanium in nitric acid and buffer solutions, Corrosion Science, Vol.38, No.11, 2061-2067, 1996.
87.	Kenji Oka, Takao Hanawa, Masayuki Kon, Hae-Hyoung Lee, Fumiaki Kawano, Yoritoki Tomotake, Matsumoto Naoyuki and Kenzo Asaoka : Effect of barium in porcelain on bonding strength of titanium-porcelain system, Dental Materials Journal, Vol.15, No.2, 111-120, 1996.
88.	Kenzo Asaoka and John Tesk : Simulation of transient thermal stress in gypsum-bonded investment, Dental Materials Journal, Vol.15, No.2, 121-131, 1996. (Summary) The aim of this study was to clarify the effect of heating rate on the development of both transient and residual stresses in investment molds. Solid, cylindrical, gypsum-based molds were modeled and theoretical calculations made of temperature distributions with a constant heating rate. These calculations used experimental thermal diffusivity data obtained with a laser flash method. The simulations calculated transient thermal stresses during heating and at the end of heating for two surface conditions: an unrestricted surface, and a surface restricted by a casting ring. The simulation model developed nonuniform strains and stresses at casting temperature; tangential stress was compressive at the surface and tensile at the mid-point for the unrestricted surface model. The surface restricted model developed compressive tangential stresses throughout the mold at the casting temperature. This resulted in significant thermal strain differences compared to the magnitudes of expansion of the mold due to heating. (Keyword) Calcium Sulfate / Compressive Strength / Computer Simulation / Dental Casting Investment / Dental Stress Analysis / diffusion / elasticity / Stress, Mechanical / thermodynamics (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.15.121 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 9550010 ● Search Scopus @ Elsevier (PMID): 9550010 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.15.121 (DOI: 10.4012/dmj.15.121, PubMed: 9550010)
89.	Takao Hanawa, Katsuhiko Asami and Kenzo Asaoka : Micro-dissolution of calcium ions from calcium-ion-implanted titanium, Corrosion Science, Vol.38, No.9, 1579-1594, 1996. (Link to Publication Site) ● Publication site (DOI): 10.1016/0010-938X(96)00053-4 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/0010-938X(96)00053-4 (DOI: 10.1016/0010-938X(96)00053-4)
90.	Kenji Oka, Fumiaki Kawano, Yoritoki Tomotake, Masayuki Kon, Takao Hanawa, Kenzo Asaoka and Naoyuki Matsumoto : Effect of ion-exchange on fracture toughness and physical strength of dental porcelains, The Journal of the Japan Prosthodontic Society, Vol.40, No.3, 598-603, 1996. (Keyword) dental porcelain / ion-exchange / fracture toughness / reliability / Weibull distribution
91.	Fumiaki Kawano, Kan Nagao, Masazumi Noda, Kenji Oka, Yoritoki Tomotake, Shuichi Kawabata, Naoyuki Matsumoto, Masayuki Kon and Kenzo Asaoka : Shock-absorbing Behavior of Soft Denture Liner, --- Part 2 Influence of Lining Design on Shock Absorbability ---, The Journal of the Japan Prosthodontic Society, Vol.40, No.3, 501-507, 1996. (Keyword) soft denture liner / lining method / acceleration / rising time / free drop test
92.	Akiko Kawasaki, Kunio Ishikawa, Toshiyuki Suge, Masahiro Yoshiyama, Kenzo Asaoka and Shigeyuki Ebisu : Effects of hexafluorosilicate on the precipitate composition and dentine tubule occlusion by calcium phosphate, Journal of Dentistry, Vol.24, No.6, 429-434, 1996. (Summary) To improve the calcium phosphate precipitation (CPP) method for the occlusion of dentine tubules with calcium phosphate, the addition of calcium hexafluorosilicate (CaSiF6) to CPP solution was evaluated in vitro with respect to its occluding capacity and the composition of the precipitate. The occlusion of dentine tubules was evaluated by SEM observations and by measurements of dentine permeability. The composition of the precipitate was determined by measuring the calcium to phosphorus (Ca/P) ratio of the precipitate in dentine tubules by energy dispersive X-ray spectroscopy (EDS). The addition of CaSiF6 to the CPP solution resulted in an increase of the Ca/P ratio in the precipitate not only on the dentine surface but also inside the dentine tubules; indicating that the precipitate became more apatitic in nature. The addition of CaSiF6 had no effect on occluding capacity in terms of measurements of dentine permeability or SEM observations. Dentine permeability decreased to approximately 4% of pretreatment values and the dentine tubules were occluded for approximately 10-15 microns from the dentine surface. It is concluded that the addition of CaSiF6 to CPP solution was desirable, since it provided a more apatitic precipitate in the dentine tubules, not only on the dentine surface but also inside the tubules, and there were no drawbacks with respect to its occluding capacity. (Keyword) Apatites / calcium / Calcium Phosphates / Chemical Precipitation / Dentin / Dentin Permeability / Durapatite / Electron Probe Microanalysis / Fluorides / Humans / Microscopy, Electron, Scanning / phosphorus / Silicates / Silicic Acid (Link to Publication Site) ● Publication site (DOI): 10.1016/0300-5712(95)00101-8 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 8990689 ● Summary page in Scopus @ Elsevier: 2-s2.0-0030276650 (DOI: 10.1016/0300-5712(95)00101-8, PubMed: 8990689, Elsevier: Scopus)
93.	Youji Miyamoto, Kunio Ishikawa, Masaaki Takechi, Masayuki Kon, Masaru Nagayama and Kenzo Asaoka : Non-decay type fast-setting calcium phosphate cement: setting behaviour in calf serum and its tissue response, Biomaterials, Vol.17, 1429-1435, 1996.
94.	Youji Miyamoto, Kunio Ishikawa, Masaaki Takechi, Masayuki Kon, Masaru Nagayama and Kenzo Asaoka : Soft tissue response of calcium phosphate cements, Bioceramics, Vol.9, 263-266, 1996.
95.	Masaaki Takechi, Youji Miyamoto, Kunio Ishikiawa, Masayuki Kon, Masaru Nagayama and Kenzo Asaoka : Basic properties of hydroxyapatite putty made with fast-setting calcium phosphate cement and sodium alginate, Bioceramic, Vol.9, 235-238, 1996.
96.	Masaaki Takechi, Youji Miyamoto, Kunio Ishikawa, Masaru Nagayama, Masayuki Kon and Kenzo Asaoka : Non-decay type fast-setting calcium phosphate cement using chitosan, Journal of Materials Science Materials in Medicine, Vol.7, No.6, 317-322, 1996.
97.	Takao Hanawa, Hidemi Ukai, Kouichi Murakami and Kenzo Asaoka : Structure of surface-modified layers of calcium-ion-implanted Ti-6Al-4V and Ti-56Ni, Materials Transactions, Vol.36, No.3, 438-444, 1995.
98.	Kunio Ishikawa, Youji Miyamoto, Masayuki Kon, Masaru Nagayama and Kenzo Asaoka : Non-decay type fast-setting calcium phosphate cement, --- : Composite with sodium alginate ---, Biomaterials, Vol.16, No.7, 527-432, 1995.
99.	Masayuki Kon, Kunio Ishikawa, Youji Miyamoto and Kenzo Asaoka : Development of calcium phosphate based functional gradient bioceramics, Biomaterials, Vol.16, No.9, 709-714, 1995.
100.	Kunio Ishikawa and Kenzo Asaoka : Estimation of ideal mechanical strength and critical porosity of calcium phosphate cement, Journal of Biomedical Materials Research, Vol.29, No.12, 1537-1543, 1995. (Summary) The ideal mechanical strength and critical porosity of calcium phosphate cement (CPC) were estimated to help determine ways to improve its properties. CPC at various porosities was made by packing CPC paste, at various powder-to-liquid (P/L) ratios (2.0-6.0), into a mold under various pressures (0-173 MPa). The mechanical strength of CPC, in terms of diametral tensile strength (DTS), increased with decreases in porosity. Intercrystalline fracture was observed in specimens made without the application of pressure, while fracture within the crystals increased with the packing pressure. These observations support the application of the relationship between DTS and porosity in fractographic equations. The ideal wet DTS and critical porosity of CPC were estimated to be 102 MPa and 63%, respectively. The minimum porosity of the currently used CPC was approximately 26-28%, even when it was packed under 173 MPa, and the maximum DTS value was thus approximately 13-14 MPa. Because reducing the porosity of currently used CPC would be difficult, we conclude that in CPC-related research, we should focus on ways in which to accelerate bone-replacing behavior, in addition to improving the mechanical strength of CPC. (Keyword) Bone Cements / Calcium Phosphates / crystallization / Hardness Tests / Microscopy, Electron, Scanning / Porosity / pressure / surface properties / Tensile Strength (Link to Publication Site) ● Publication site (DOI): 10.1002/jbm.820291210 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 8600144 ● Search Scopus @ Elsevier (PMID): 8600144 ● Search Scopus @ Elsevier (DOI): 10.1002/jbm.820291210 (DOI: 10.1002/jbm.820291210, PubMed: 8600144)
101.	Fumiaki Kawano, Kan Nagao, Kenji Oka, Yoritoki Tomotake, Masayuki Kon, Kenzo Asaoka and Naoyuki Matsumoto : Studies on Soft Denture Liner by using Viscoelastic Analysis, --- Part 3. Effect of Viscosity of Soft Lining Materials on Stress Distribution in Denture Supporting Structures ---, The Journal of the Japan Prosthodontic Society, Vol.39, No.6, 1004-1009, 1995. (Keyword) viscoelastic finite element method / supporting structure / soft denture liner / viscosity / stress distribution
102.	Youji Miyamoto, Kunio Ishikawa, Hirokazu Fukao, Masahiro Sawada, Masaru Nagayama, Masayuki Kon and Kenzo Asaoka : In vivo setting behavior of fast-setting calcium phosphate cement, Biomaterials, Vol.16, No.11, 855-860, 1995. (Summary) The in vivo setting behaviour of fast-setting calcium phosphate cement (FSCPC) between femoral muscles of the rat was investigated to evaluate the possible value of FSCPC for medical and dental application. Conventional CPC (c-CPC) and FSCPC were implanted between femoral muscles, and various aspects of the setting behaviour such as setting time, mechanical strength and conversion ratio of cement into hydroxyapatite (HAP: Ca10(PO4)6(OH)2) were measured by the Vicat needle method, diametral tensile strength (DTS) measurement, and quantitative powder X-ray diffraction (XRD) analysis, respectively. The setting time of FSCPC in vivo was 5-7 min, in contrast to 48 min for c-CPC. As a result of its fast setting, set specimens of FSCPC showed higher mechanical strength from the initial stage than c-CPC. Higher DTS values were observed in FSCPC than c-CPC implanted after 24 h. Powder XRD analysis revealed faster conversion of FSCPC than c-CPC into HAP, which was responsible both for the faster setting and higher mechanical strength from the initial stage. We concluded, therefore, that FSCPC may be used for a wide range of clinical applications, i.e. fields where fast setting is required such as orthopaedic, plastic and reconstructive, and oral and maxillofacial surgery. (Keyword) Animals / Biocompatible Materials / Bone Cements / Calcium Phosphates / Durapatite / Femur / Male / Muscle, Skeletal / Prostheses and Implants / Rats / Rats, Wistar / Tensile Strength / X-ray diffraction (Link to Publication Site) ● Publication site (DOI): 10.1016/0142-9612(95)94147-D (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 8527601 ● Search Scopus @ Elsevier (PMID): 8527601 ● Search Scopus @ Elsevier (DOI): 10.1016/0142-9612(95)94147-D (DOI: 10.1016/0142-9612(95)94147-D, PubMed: 8527601)
103.	Kenzo Asaoka, Masayuki Kon and Fumiaki Kawano : Thermal Diffusivity of Dental Ceramics at Room and Elevated Temperatures, The Journal of the Japanese Society for Dental Materials and Devices, Vol.14, No.1, 87-92, 1995. (Keyword) Porcelain / Porcelain for metal-ceramics / Aluminous porcelain / Castable ceramics / Thermal diffusivity / Residual stress
104.	Toshiyuki Suge, Kunio Ishikawa, Akiko Kawasaki, Masahiro Yoshiyama, Kenzo Asaoka and Shigeyuki Ebisu : Effects of fluoride on the calcium phosphate pricipitation method for dentinal tubules occlusion, Journal of Dental Research, Vol.74, No.4, 1079-1085, 1995.
105.	Toshiyuki Suge, Kunio Ishikawa, Akiko Kawasaki, Masahiro Yoshiyama, Kenzo Asaoka and Shigeyuki Ebisu : Duration of dentinal tubule occlusion formed by calcium phosphate precipitation method: in vitro evaluation using synthetic saliva, Journal of Dental Research, Vol.74, No.10, 1079-1714, 1995.
106.	Yoshio Tada, Fumiaki Kawano, Masayuki Kon, Naoyuki Matsumoto and Kenzo Asaoka : Influence of crystallization on strength and color of castable glass-ceramics containing two crystals, Bio-Medical Materials and Engineering, Vol.5, No.4, 233-243, 1995. (Keyword) castable ceramics / color / transparency / strength / ceramming temperature
107.	Kunio Ishikawa, Shozo Takagi, LC Chow, Y Ishikawa, ED Eanes and Kenzo Asaoka : Behavior of a calcium phosphate cement in simulated blood plasma in vitro, Dental Materials, Vol.10, No.1, 26-32, 1994.
108.	Takao Hanawa, Masayuki Kon, Shoji Ookawa and Kenzo Asaoka : Diffusion of elements in porcelain into titanium oxide, Dental Materials Journal, Vol.13, No.2, 164-173, 1994.
109.	Fumiaki Kawano, Kan Nagao, Sanshiro Inoue, Masayuki Kon, Kenzo Asaoka and Naoyuki Matsumoto : Studies on Soft Denture Liner by using Viscoelastic Analysis, --- Part 2. Effect of Lining Method of Denture Liner on Stress Distribution in Supporting Structures ---, The Journal of the Japan Prosthodontic Society, Vol.38, No.6, 1328-1335, 1994. (Keyword) viscoelastic finite element analysis / supporting structure / soft denture liner / lining method / stress distribution
110.	Masayuki Kon, Fumiaki Kawano, Kenzo Asaoka and Naoyuki Matsumoto : Effect of leucite crystals on the strength of glassy porcelain, Dental Materials Journal, Vol.13, No.2, 138-147, 1994. (Keyword) Dental porcelain / Leucite crystal / Fracture strength
111.	Takao Hanawa, Yoshinobu Nodasaka, Hidemi Ukai, Kouichi Murakami and Kenzo Asaoka : Compatibility of MC3T3-E1 cells with calcium-ion-implanted titanium, 生体材料, Vol.12, No.5, 209-216, 1994.
112.	Kenzo Asaoka : Effects of creep value and occlusal force on marginal adaptation of amalgam filling, Journal of Dental Research, Vol.73, No.9, 1539-1545, 1994.
113.	Kenichi Yoshida, Kenzo Asaoka and Masashi Yamanaka : Acoustic emission measurements during order-disorder transformation and isothermal ordering process of Pd-Cu alloys, Journal of the Japan Institute Metals, Vol.58, No.9, 989-993, 1994.
114.	Masayuki Kon, Fumiaki Kawano, Yoshio Tada, Sanshiro Inoue, Kenzo Asaoka and Naoyuki Matsumoto : Effect of crystallization on fracture strength of castable glass-ceramics containing two crystals, Dental Materials Journal, Vol.13, No.1, 47-54, 1994.
115.	Kunio Ishikawa, ED Eanes and Kenzo Asaoka : Effect of calcium ions on hydroxyapatite formation from the hydrolysis of anhydrous dicalcium phosphate, Dental Materials Journal, Vol.13, No.2, 182-189, 1994. (Summary) Effects of solution calcium ions on hydroxyapatite (HAP) formation from the hydrolysis of dicalcium phosphate anhydrous (DCPA) were investigated under controlled solution conditions. The hydrolysis experiments (2.5 mmol DCPA/250 mL) were carried out at fixed pH in the absence or presence of CaCl2 (0-200 mmol/L) by standard pH stat techniques at 37 degrees C. The rate of hydrolysis was much faster, and the yield of HAP approximately doubled in the presence of CaCl2 when compared to no CaCl2, but no significant difference was observed over the range of Ca2+ concentrations examined (25-200 mmol/L). At equivalent conversion times, the crystallinity of the HAP formed was also greater in the presence of CaCl2. Calculations showed that much less DCPA dissolved to reach solution equilibrium with respect to HAP in the presence than in the absence of CaCl2. We conclude, therefore, that solution Ca2+ is an important factor in controlling HAP formation from the hydrolysis of acidic calcium phosphates such as DCPA. (Keyword) calcium / Calcium Chloride / Calcium Phosphates / crystallization / Durapatite / Hydrolysis / Ions / Time Factors (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.13.182 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 7758278 ● Search Scopus @ Elsevier (PMID): 7758278 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.13.182 (DOI: 10.4012/dmj.13.182, PubMed: 7758278)
116.	Yoshio Tada, Fumiaki Kawano, Masayuki Kon, Sanshiro Inoue, Hidefumi Ohta, Naoyuki Matsumoto and Kenzo Asaoka : Properties of Castable Glass-ceramics Containing Cystalline Apatite and Magnesium Titanate, The Journal of the Japan Prosthodontic Society, Vol.38, No.2, 435-441, 1994.
117.	Kunio Ishikawa, Toshiyuki Suge, Masahiro Yshiyama, Akiko Kawasaki, Kenzo Asaoka and Shigeyuki Ebisu : Occlusion of dentinal tubules with calcium phosphate using acidic calcium phosphate solution followed by neutralization., Journal of Dental Research, Vol.73, No.6, 1197-1204, 1994.
118.	Fumiaki Kawano, Kan Nagao, Masazumi Noda, Naoyuki Matsumoto, Masayuki Kon and Kenzo Asaoka : Shock-absorbing Behavior of Soft Denture Liner, --- Part 1 Plate Specimens ---, The Journal of the Japan Prosthodontic Society, Vol.37, No.6, 1172-1179, 1993. (Keyword) soft denture liner / shock absorbability / drop-ball test
119.	Fumiaki Kawano, Andrew Koran, Kenzo Asaoka and Naoyuki Matsumoto : Effect of soft denture liner on stress distribution in supporting structures under a denture, The International Journal of Prosthodontics, Vol.6, No.1, 43-49, 1993. (Summary) This study examined the effect of a soft denture liner on the distribution of stresses in the denture-supporting structures. Dentures without a linear and with three configurations of a soft liner were simulated by using a two-dimensional viscoelastic finite-element stress analysis. The stress intensity at functional force-bearing areas decreased when a soft denture liner was used. However, the stresses in the bone increased remarkably up to 3.0 seconds after loading. Because of the time-dependent effect of stresses applied to soft denture liners, denture patients who clench or brux may not benefit as greatly from soft denture liners. The study indicates that viscoelastic finite-element analysis is helpful for evaluating soft denture liners. Soft denture liners appear to be useful for improving the stress distribution in the supporting structures under dentures. (Keyword) Alveolar Process / Dental Stress Analysis / Denture Liners / Denture, Complete / elasticity / Gingiva / Humans (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 8507329 ● Search Scopus @ Elsevier (PMID): 8507329 (PubMed: 8507329)
120.	Fumiaki Kawano, Kenzo Asaoka, Kan Nagao, Nozomu Tada and Naoyuki Matsumoto : Studies on Soft Denture Liner by using Viscoelastic Analysis, --- Part 1 Effect of Soft Denture Liner on Stress Distribution in Supporting Structures ---, The Journal of the Japan Prosthodontic Society, Vol.36, No.6, 1305-1311, 1992. (Keyword) viscoelastic finite element / supporting structure / soft denture liner / stress distribution
121.	Fumiaki Kawano, Kenzo Asaoka, Kan Nagao, Nozomu Tada and Naoyuki Matsumoto : Viscoelastic Analysis of the Supporting Structures under Denture, --- Part 1 Effect of the Artificial Teeth Arrangment on the Stress Distributions in the Supporting Structures ---, The Journal of the Japan Prosthodontic Society, Vol.36, No.6, 1186-1192, 1992. (Keyword) viscoelastic finite element analysis / tooth arrangement / stress distribution / supporting structure
122.	Kenzo Asaoka, Kenichi Yoshida and Kiyoshi Sakamaki : Effect of transient stress on acoustic emission behaviour during firing of dental porcelain, Journal of Materials Science, Vol.27, No.11, 3118-3122, 1992. (Summary) 本論文は，歯科材料であるポーセレンの熱処理中のAE計測を行い，400∼600℃で発生するAEの発生源は，ガラス転移点以上におけるポーセレンに発生するトランジェント応力の緩和によることが，シミュレーション結果と良い対応を示していることから明らかにされたことを述べている． (Link to Publication Site) ● Publication site (DOI): 10.1007/BF01154127 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/BF01154127 (DOI: 10.1007/BF01154127)
123.	Kenzo Asaoka, Norihiko Kuwayama and John Tesk : Influence of tempering method on residual stress in dental porcelain, Journal of Dental Research, Vol.71, No.9, 1623-1627, 1992. (Summary) The porcelain component of a porcelain-fused-to-metal restoration is strengthened by residual (tempering) stresses which are induced by cooling procedures followed in dental laboratories. The thermophysical properties of materials and cooling rate are the main factors which determine the residual stress. In this paper, the temperatures in the midplane of body-porcelain disks were measured from a heat-soak temperature (1000 degrees C) to room temperature during two different cooling procedures: slow cooling in air and forced-air cooling. Experimental results approximated exponential cooling wherein the cooling rates could be represented by a linear equation of temperature. Residual stresses, as affected by the tempering method and thickness of a porcelain disk, were calculated by computer simulation for regions away from the edges. The following temperature-dependent factors were incorporated into the simulation: elastic modulus, viscosity, and coefficient of thermal expansion. The cooling rate dependencies of the glass transition temperature and the temperature distribution during cooling were also included. The cooling rates used in this simulation were derived from the tempering data. The agreement between development of transient and residual stresses--calculated by computer simulation for various cooling methods, and the tendency toward failures of porcelain disks subjected to the tempering processes--was examined. Simulated residual stresses were also in good agreement with those measured by the indentation fracture method of Marshall and Lawn (1977) and Anusavice et al. (1989). (Keyword) Computer Simulation / Dental Porcelain / Dental Stress Analysis / elasticity / Hardness / Hot Temperature / Materials Testing / Viscosity (Link to Publication Site) ● Publication site (DOI): 10.1177/00220345920710091501 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 1522297 ● Search Scopus @ Elsevier (PMID): 1522297 ● Search Scopus @ Elsevier (DOI): 10.1177/00220345920710091501 (DOI: 10.1177/00220345920710091501, PubMed: 1522297)
124.	Kenzo Asaoka and Kenichi Yoshida : 金属焼付陶材の加熱/冷却過程でのAE挙動, The Journal of the Japanese Society for Dental Materials and Devices, Vol.11, No.5, 800-807, 1992. (Summary) 本論文は，陶材/合金積層板の加熱，冷却過程でのAE波の発生を測定し，加熱および冷却中に高温で発生するAEは，陶材の粘弾性変形量に依存しており，冷却中，低温で発生するAEは，合金板による陶材のせん断流れの拘束に依存していることが，シミュレーションにより明らかにされ，異種材料の接合過程で生ずる不適合応力の発生と緩和をAE法により動的に調べることができる可能性を述べている．
125.	Kenzo Asaoka, Akkas SM Ali and Norihiko Kuwayama : Evaluation of fracture toughness and residual stress in dental porcelain by indentation-microfracture method, The Journal of the Japanese Society for Dental Materials and Devices, Vol.11, No.4, 656-661, 1992. (Summary) The indentation microfracture(IM)method was applied to estimate the fracture toughness and residual stress in the surface of dental porcelains which were slowly cooled and tempered by two different treatments.The shape parameter, m, in Weibull plots of the K_c's which were measured by IM method, was calculated to be 7.7 to 9.1 for the slow cooled specimen.Tempering had no significant effect on Weibull parameter.Factor of safety for the porcelain used for prosthesis was estimated to be 3.4 to 4.9 for the failure probability of 10^<-5>.Surface residual stress was estimated to be 26-28 and 64-88MPa(in compression)for the porcelain tempered in ambient air and forced air, respectively, from the median crack size after indentation.Estimated residual stress was in good agreement with the results of computer simulation by Asaoka et al.However, the residual stress could not be calculated for the porcelain with crystallization in its glass transition range during cooling because the reference sample was difficult to prepare.In concludsion, the fracture toughness and residual stress in micro-area(100∼400μm)of the dental baked-on porcelain prosthesis can be measured by the IM method. (Keyword) Dental porcelain / Fracture toughness / residual stress / Tempering (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390845713001894784 (CiNii: 1390845713001894784)
126.	Kenzo Asaoka, Akkas SM Ali and Norihiko Kuwayama : Temperature dependence of the coefficient of thermal expansion and viscosity of dental porcelains, The Journal of the Japanese Society for Dental Materials and Devices, Vol.11, No.2, 250-255, 1992. (Summary) Temperature dependence of thermal coefficient of expansion was measured for six commercial body and opaque dental porcelains.The dependence of coefficient of thermal expansion on temperature in the glass transition range was over ten times higher than that of the glassy solid state of the porcelain during the heating process.The onset of the glass transition range and the temperature where the apparent coefficient of expansion reached the maximum value(determined from thermal deformation)were almost equal to the strain and the annealing points(defined by viscosity).The surface compressive residual stress for the 2mm thick porcelain slabs was simulated to be 16∼25 and 63∼92MPa, respectively, for the porcelain-cooled in air at ambient temperature and for that cooled with forced convection of compressed air from a temperature higher than the porcelain sag point.These findings suggested that the coefficient of thermal expansion in the glass transition range and viscoelastic behaviour of the porcelain are the major factors determining the residual stress in the porcelain-fused-to-metal(PEM)restorations, because the difference of the coefficient of thermal expansion between porcelain and alloy at the temperature where incompatible stress builds up was calculated to be much higher than 10×10^<-6>/℃. (Keyword) Dental porcelain / Coefficient of thermal expansion / Viscosity / Glass transition range / residual stress (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679185533952 (CiNii: 1390282679185533952)
127.	Kenzo Asaoka, Fumiaki Kawano and Norihiko Kuwayama : Computer Simulation on Creep of Amalgam in Class I Cavity, --- Occlusal Force was Loaded on Amalgam Filling ---, The Journal of the Japanese Society for Dental Materials and Devices, Vol.11, No.6, 928-933, 1992. (Keyword) Amalgam / Creep / Finite element method / Marginal fracture
128.	Kenzo Asaoka and Fumiaki Kawano : Computer simulation on creep of amalgam in class I cavity, Bio-Medical Materials and Engineering, Vol.2, No.1, 41-50, 1992. (Keyword) denal amalgam / creep / finite element method / marginal fracture / cavity preparation
129.	Kenzo Asaoka, Fumiaki Kawano and Norihiko Kuwayama : Computer Simulation on Creep of Amalgam in Class I Cavity, --- Occlusal Force was Loaded on Enamel ---, The Journal of the Japanese Society for Dental Materials and Devices, Vol.11, No.4, 584-591, 1992. (Keyword) Amalgam / Creep / Finite element method / Marginal fracture
130.	Kenzo Asaoka : Transient and residual stress in porcelain/alloy strip for dental use as affected by tempering, JSME International Journal. Series. 1, Solid Mechanics, Strength of Materials, Vol.34, No.2, 156-162, 1991. (Summary) Porcelain-fused-to-metal (PFM) restorations may develop cracks during processing or in-mouth service if the relative physico-mechanical properties of the porcelain and alloy are highly mismatched. The precise conditions when it might occur are not known. Many processing and property variations can affect the stresses developed throughout a porcelain-alloy system. To understand this, a computer simulation of stress in a PFM strip was conducted. The simulation considers cooling from temperatures higher than the porcelain sag point. The following temperature-dependent factors were incorporated : the elastic modulus, shear viscosity (porcelain), and coefficient of thermal expansion. Cooling rates during tempering of porcelain were measured. The cooling rate dependencies of the glass transition temperature and temperature distribution during cooling were also included in the simulation. The results suggest that tempering with a high cooling rate make up for compressive residual stress in body porcelain and the high curvature of the composite beam. (Keyword) Biomaterials / Laminated Construction / residual stress / Thermal Stress / viscoelasticity / Transient Stress (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001205431907968 (CiNii: 1390001205431907968)
131.	Kenzo Asaoka and John Tesk : Visco-elastic deformation of dental porcelain and porcelain -metal compatibility, Dental Materials, Vol.7, No.1, 30-35, 1991.
132.	Kenzo Asaoka, Masayuki Kon and Norihiko Kuwayama : Viscosity of dental porcelains in glass transition range, Dental Materials Journal, Vol.9, No.2, 193-202, 1990. (Summary) Changes in the viscosity of dental porcelain as a function of temperature are the controlling factor determining incompatible stresses in porcelain-fused-to-metal restorations. A new method was used to estimate viscosity using a viscoelastic analytical model that considers the relation between the heating rate and deformation temperature (Td) of dental porcelain with stress applied during heating. The activation energy of viscous flow and the viscous constant in the Arrhenius equation were calculated for six kinds of commercial body and opaque porcelains. The effect of the heating rate on the instantaneous coefficient of thermal expansion was also measured. Tg onset was graphically determined using data on thermal deformation and agreed well with the strain point as defined by viscosity. The data gathered in this study was also compared to the experimental results of previous works by others. (Keyword) Dental Porcelain / Dental Stress Analysis / Glass / Hot Temperature / Viscosity (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.9.193 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 2099888 ● Search Scopus @ Elsevier (PMID): 2099888 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.9.193 (DOI: 10.4012/dmj.9.193, PubMed: 2099888)
133.	Kenzo Asaoka and Norihiko Kuwayama : Temperature dependence of thermal expansion coefficient for palladium based binary alloy, Dental Materials Journal, Vol.19, No.1, 47-57, 1990. (Summary) Temperature dependencies of thermal expansion coefficients for the alloys of Pd-Ag, Pd-Cu and Pd-Co binary systems were measured at temperatures up to 900 degrees C, with heating and cooling rates of 5 degrees C/min. The coefficient of thermal expansion of alloys with no transformation in the temperature range of interest in porcelain firing was well approximated by a linear equation of temperature. The constants in the equation were shown as a function of the weight for the added element. Thermal expansion of the palladium-based alloy with no transformation was well estimated at any temperature range and at any composition by using the constants represented here. The coefficients of thermal expansion before and after order-disorder transformation and magnetic transformation were measured in Pd-Cu and Pd-Co alloys, respectively. The results suggest that transient and residual stresses in porcelain-fused-to-metal restorations can be effectively controlled by making use of transformation of the alloy. (Keyword) Cobalt / Copper / Dental Alloys / Dental Porcelain / Hot Temperature / Magnetics / Palladium / Silver / temperature (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.9.47 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 2098210 ● Search Scopus @ Elsevier (PMID): 2098210 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.9.47 (DOI: 10.4012/dmj.9.47, PubMed: 2098210)
134.	Fumiaki Kawano, Kenzo Asaoka, Kan Nagao and Naoyuki Matsumoto : Effect of viscoelastic deformation of soft tissue on stresses in the structures under complete denture, Dental Materials Journal, Vol.9, No.1, 70-79, 1990. (Keyword) Soft tissue / Finite element stress analysis / Viscoelastic deformation
135.	Toshihiko Miki, Kenzo Asaoka, Norihiko Kuwayama and Terushige Kawata : Finite Element Analysis on Physiological Mobility of Individual Teeth, The Journal of the Japanese Society for Dental Materials and Devices, Vol.9, No.2, 189-196, 1990. (Summary) The initial movement of the tooth was investigated by the finite element method.The mechanical properties of the periodontal membrane were estimated from the results of the simulation.The analysis was made by using an 8-point isoparametric finite element method.The upper central incisor with an axial directional load was simulated.The concept of the apparent elastic modulus was introduced to the stress-strain relation of the soft tissue, that is, soft tissue such as the periodontal membrane and the gingiva was considered to have stress dependent elastic moduli.At the first stage of the simulation, the stress and strain distributions in the paradentium were calculated by the conventional method.From the next stage, the apparent elastic moduli for the soft tissue were introduced to the calculation, that is, the elastic moduli for the soft tissue were computed from the calculated equivalent stresses of the previous stage.The calculations were repeated until the displacement values converged.The initial displacement of the tooth was not proportional to the applied load but showed a non-linear relationship.The relationship between load and displacement was approxiated by the n-th power equation.These results were in agreement with the clinical experimental results.The periodontal membrane is built up of different elastic moduli.The elastic moduli were low at the alveolar edge and the root apex.The equivalent stresses of the periodontal membrane were marked low in the alveolar edge and the root apex.In conclusion, the concept of the apparent elastic modulus is useful to investigate the initial movement of the tooth and estimate the mechanical properties of the periodontal membrane. (Keyword) Tooth mobility / finite element method / Stress-strain relation of the soft tissue / Mechanical properties of periodontal membrane (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679185255040 (CiNii: 1390282679185255040)
136.	Kenzo Asaoka and John Tesk : Transient and residual stress in a porcelain-metal strip, Journal of Dental Research, Vol.69, No.2, 463-469, 1990. (Summary) Porcelain-fused-to-metal (PFM) restorations may develop cracks during processing or in-mouth service if the relative physico-mechanical properties of the porcelain and metal are highly mismatched. Precise conditions when this might occur are not known. Many processing and property variations can affect the stresses developed throughout a porcelain-metal system. To understand this, we conducted a computer simulation of stress developed in a PFM beam. The simulation considers cooling from temperatures higher than the porcelain sagpoint. The following temperature-dependent factors were incorporated: the elastic modulus, shear viscosity (porcelain), and coefficients of thermal expansion. The cooling rate dependencies of the glass transition temperature, (Tg), and the temperature distribution during cooling were also included. The results suggest that transient tensile stress at the porcelain alloy interface may result in cracks in the porcelain during cooling. Occlusal forces may set up stresses to cause cracking at the surface of the porcelain if the compressive residual stress is not high enough. PFM restorations with an alloy of high thermal expansion coefficient require rapid cooling; on the contrary, PFM restorations with the alloys of lower coefficients require slow cooling. A high cooling rate can make up for thermal expansion mismatches between the alloy and the porcelain up to 2 x 10(-6)/degrees C. Finally, the results indicated that curvature was not a sensitive indication of stress for a multimaterial beam when visco-elastic relaxation and high cooling rates are involved. For the case modeled here, curvature varied inversely with a 1/2 to 1/7th power of the stress. (Keyword) Computer Simulation / Dental Alloys / Dental Porcelain / Dental Stress Analysis / elasticity / surface properties / temperature / Tensile Strength / Time Factors / Viscosity (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 2307748 ● Search Scopus @ Elsevier (PMID): 2307748 (PubMed: 2307748)
137.	Kenzo Asaoka and John Tesk : Transient and residual stresses in dental porcelain as affected by cooling rates, Dental Materials Journal, Vol.8, No.1, 9-25, 1989. (Summary) The development of either transient or residual stress in a slab of dental porcelain during cooling was simulated by use of a super-computer. The temperature dependences of the elastic modulus, the thermal expansion coefficient, and the shear viscosity, and the cooling rate dependence of the glass transition temperature, Tg, were considered in this calculation. Internal stress and viscoelastic creep were computed for several cooling rates. Calculated results display stress profiles which agree reasonably well with reported measured profiles in quenched, tempered glasses. The calculated residual surface stress, sigma, could be fit by the following empirical formula, sigma = kl2(q/q0)n, q is the cooling rate, q0 is a reference cooling rate and l is the half-thickness of the porcelain. The method by which residual stress develops is also discussed. This discussion suggests a method for strengthening of the porcelain by the development of high-compressive residual stress on the surface. (Keyword) Computer Simulation / Dental Porcelain / Dental Stress Analysis / elasticity / temperature (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.8.9 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 2638963 ● Search Scopus @ Elsevier (PMID): 2638963 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.8.9 (DOI: 10.4012/dmj.8.9, PubMed: 2638963)
138.	Kenzo Asaoka and Norihiko Kuwayama : Estimation of residual stress in porcelain alloy system by thermal shock test, Dental Materials Journal, Vol.5, No.2, 145-157, 1986. (Keyword) Dental Alloys / Dental Porcelain / Dental Stress Analysis / Denture, Partial, Fixed / Hot Temperature / Stress, Mechanical (Link to Publication Site) ● Publication site (DOI): 10.4012/dmj.5.145 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 3505465 ● Search Scopus @ Elsevier (PMID): 3505465 ● Search Scopus @ Elsevier (DOI): 10.4012/dmj.5.145 (DOI: 10.4012/dmj.5.145, PubMed: 3505465)
139.	Kenzo Asaoka, Norihiko Kuwayama, Osamu Okuno and Ishi Miura : Mechanical properties and biomechanical compatibility of porous titanium for dental implants, Journal of Biomedical Materials Research, Vol.19, No.6, 699-713, 1985. (Summary) Titanium powder with a granule diameter of 420-500 micron was prepared and porous titanium specimens were made from this powder. The mechanical properties of these specimens were examined. The compressive strength and low cyclic compressive fatigue strength were 182 and 40 MPa, respectively. Fractography was also observed by scanning electron microscopy. Typical fatigue characteristics of the bonding areas of the powder were observed. In addition, porous-titanium-coated dental implants with pure titanium cores were prepared. The compressive strength of the material used was 230 MPa, fatigue strength not being improved. Biomechanical stress calculations using the finite element method were made using a model that employed the use of the material implanted in alveolar bone. Shear stress at the implant-bone interface as well as compressive stress concentrations in the bone was calculated. The most suitable elastic modulus for the dental implant was then estimated from these calculations. Finally, based on these results, the use of porous titanium for dental implants was assessed. (Keyword) Chemical Phenomena / Chemistry / Dental Implantation / Evaluation Studies as Topic / Humans / Microscopy, Electron, Scanning / Stress, Mechanical / Tensile Strength / titanium (Link to Publication Site) ● Publication site (DOI): 10.1002/jbm.820190609 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 4077891 ● Search Scopus @ Elsevier (PMID): 4077891 ● Search Scopus @ Elsevier (DOI): 10.1002/jbm.820190609 (DOI: 10.1002/jbm.820190609, PubMed: 4077891)
140.	Kenzo Asaoka and Norihiko Kuwayama : Evaluation of thermal residual stress after firing of porcelain/alloy veneer, Dental Materials Journal, Vol.3, No.2, 139-147, 1984. (Keyword) Chemistry, Physical / Dental Alloys / Dental Casting Technique / Dental Porcelain / Dental Veneers / Hot Temperature / Physicochemical Phenomena / Stress, Mechanical (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 6397294 ● Search Scopus @ Elsevier (PMID): 6397294 (PubMed: 6397294)
141.	Kenzo Asaoka, Kouichirou Tsuji and Norihiko Kuwayama : Correlation between microstructure of Ag-Pd-Au-Cu alloy and changes in shape on aging, Journal of Biomedical Materials Research, Vol.18, No.6, 707-716, 1984. (Summary) An investigation has been carried out to study changes in shape on aging in plastic deformed Ag-Pd-Au-Cu alloys. The changes in shape were measured in order to establish a relationship to the aging heat treatments. Their microstructure was observed in order to clarify this phenomenon at the same time. They were also investigated quantitatively using a feature analysis system. The changes in shape were interpreted as the shrinkage in volume resulting from the formation of the ordered phase. They were smaller at aging temperatures below 673 K. The change in microstructure was different at aging temperature between 573 and 773 K. These phenomena were due to the following: First, nodules which nucleated at the grain boundaries would have grown into the grains well before the formation of the ordered phase, and second, the shrinkage in volume would have been of a different kind that the ordered phase. Therefore aging treatments should be carried out at low temperature in order to minimize the changes in shape. Also, nodular growth should be inhibited in order to maximize the hardening in Ag-rich alloys. (Keyword) Alloys / Copper / Gold / Hardness / Lead / Particle Size / Silver / Time Factors (Link to Publication Site) ● Publication site (DOI): 10.1002/jbm.820180611 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 6544772 ● Search Scopus @ Elsevier (PMID): 6544772 ● Search Scopus @ Elsevier (DOI): 10.1002/jbm.820180611 (DOI: 10.1002/jbm.820180611, PubMed: 6544772)
142.	Masayuki Kon, Kenzo Asaoka and Norihiko Kuwayama : Studies on Sintering of Dental Porcelain : (Part 4)Strength and Transluency of Sintered Composite, The Journal of the Japanese Society for Dental Materials and Devices, Vol.1, No.2, 118-123, 1982. (Summary) The sintered composite were made from mixed powder compacts prepared from low fusing glass powders and each one of alumina powder, quartz powder, silica glass powder using sintering method at the temperature to 1000℃, and the affections of physical properties of sintered composite were investigated by measurements of transverse strength and transparency.Transverse strength value of sintered composite of alumina and pyrex glass(expansion coefficient 3.6×10^<-6>)or soda-lime-silica glass(10.7×10^<-6>)increased with increase alumina content, particularly sintered composite with 50wt% alumina addition showed the transverse strength value of 170-180MPa.The addition of alumina was more effective on the strength of sintered composite comparing with quartz and silica glass, inversely, transparency of sintered composite decreased with increase of alumina content.In the case of the sintered composite of silica glass and low fusing glass, transverse strength velue decreased with increase of silica glass content.The sintered composite with silica glass addition showed smaller transparency value by difference of the refractive index due to the generation of cristobalite followed with the crystallization of cristobalite than that without crystallizing property. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390845713032430848 (CiNii: 1390845713032430848)
143.	Kenzo Asaoka and Norihiko Kuwayama : Studies on the Mechanical Properties of a Metal-Ceramic Restoration : (Part 2)Residual Stress and Deformation during Cooling Down, The Journal of the Japanese Society for Dental Materials and Devices, Vol.1, No.1, 10-16, 1982. (Summary) Residual stress and deformation of the porcelain fused to metal restoration were calculated by the theory of statically indeterminate beam and the finite element method.Physical and mechanical properties of the materials were supposed not to change from the softening temperature of ceramic to the room temperature.The effect of the thermal expansion coefficient, the elastic modulus of metal, the softening temperature of ceramic, and the thickness ratio of metal to ceramic were calculated.The following results were obtained.(1)Theory of statically indeterminate beam was good agreement with the finite element analysis.(2)From the calculation on the effect of the thermal expansion coefficient, the residual stress and the deformation were directly in proportion to the difference in thermal expansion coefficients of metal and ceramic.(3)If the metal had low elastic modulus, so the residual stress in ceramic was low, and the deformation of the sintered porcelain veneer was small.But the elastic modulus had smaller effect on the internal stress and the deformation than the thermal expansion coefficient.(4)If the softening temperature of ceramic droped, so internal stress decreased.But the softening temperature had only smaller effect.(5)If the thickness of the metal took under 20% of the sintered porcelain veneer, residual stress in ceramic was low.But over 80%, the stress rapidly increased.If the metal thickness took from 20% to 80% the stress at the interface had nearly constant value.So, the change of metal thickness for this range is not effecrtive for the arrest of the interface fracture. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001288103105152 (CiNii: 1390001288103105152)
144.	Kenzo Asaoka, Kouichirou Tsuji and Norihiko Kuwayama : 金銀パラジウム合金の機械的性質に関する研究, 歯科理工学雑誌, Vol.22, No.60, 271-276, 1981.
145.	Kenzo Asaoka and Norihiko Kuwayama : 金属焼付陶材の機械的性質に関する検討, Journal of the Japan Society for Dental Apparatus and Materials, Vol.21, No.54, 103-108, 1980. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1524232505408660992 (CiNii: 1524232505408660992)
146.	Kenzo Asaoka and Ishi Miura : 複合2相合金の機械的性質に関する有限要素シミュレーション, Journal of the Japan Institute Metals, Vol.43, No.6, 557-562, 1979.
147.	Kenzo Asaoka and Ishi Miura : 2相合金における引張変形挙動と破壊の起源について, Journal of the Japan Institute Metals, Vol.42, No.4, 341-346, 1978.
148.	Kenzo Asaoka and Ishi Miura : 有限要素法によるOFF AXIS短繊維強化合金の引張強度に関する研究, Journal of the Japan Institute Metals, Vol.40, No.6, 644-649, 1976.
149.	Ishi Miura and Kenzo Asaoka : 延性破壊におけるvoidの起源と成長に関するシミュレーション, Journal of the Japan Institute Metals, Vol.39, No.10, 1025-1032, 1975.
150.	Ishi Miura and Kenzo Asaoka : 粒子を含む複相合金の引張挙動に関するシミュレーション, Journal of the Japan Institute Metals, Vol.37, No.11, 1207-1212, 1973.
151.	Ishi Miura and Kenzo Asaoka : 繊維型第2相を含む複相合金の引張挙動に関するシミュレーション, Journal of the Japan Institute Metals, Vol.37, No.11, 1212-1216, 1973. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1520009410316168832 (CiNii: 1520009410316168832)

Academic Paper (Unrefereed Paper):

1.	Kenzo Asaoka and Kunimitsu Maejima : Effect of surface oxide films on degradation of titanium, Materials Science Forum, Vol.539-543, 3649-3654, 2007. (Link to Publication Site) ● Publication site (DOI): 10.4028/www.scientific.net/MSF.539-543.3649 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-38349042544 (DOI: 10.4028/www.scientific.net/MSF.539-543.3649, Elsevier: Scopus)
2.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : Effects of fiber-resin interface property on shape recovery and mechanical properties of denture-base-resin matrix smart composite, Materials Science Forum, Vol.539-543, 3279-3284, 2007. (Link to Publication Site) ● Publication site (DOI): 10.4028/www.scientific.net/MSF.539-543.3279 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-38349119195 (DOI: 10.4028/www.scientific.net/MSF.539-543.3279, Elsevier: Scopus)
3.	Yuki Sakamoto, Kenzo Asaoka, Masayuki Kon, Toshio Matsubara and Kenichi Yoshida : Porous titanium compacts as biomaterials for hard tissue replacement, Porous Metals and Metal Foaming Technology (JIMIC=4), 55-58, 2006.
4.	Kenzo Asaoka : Porous titanium compacts as advanced medical device, Cellular Metals for Structural and Functional Applications, 69-77, 2005.
5.	Kenzo Asaoka : Modeling simulation of graded function in biomaterials, Proceedings of the 15th Symposium on Functionally Graded Materials, 75-80, 2004.
6.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : Shape recovery of Ni-Ti alloy fiber-reinforced denture base resin by smart repair process, Materials Science Forum, Vol.426-432, 2327-2332, 2003. (Keyword) smart composite / medical application / shape memory alloy / Ni-Ti / fiber reinforcement (Link to Publication Site) ● Publication site (DOI): 10.4028/www.scientific.net/MSF.426-432.2327 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0038338989 (DOI: 10.4028/www.scientific.net/MSF.426-432.2327, Elsevier: Scopus)
7.	Masayuki Kon, Mayumi Luciana Hirakata, Youji Miyamoto and Kenzo Asaoka : Evaluation of bioceramics containing a-tricalcium phosphate, Archives of BioCeramics Research, Vol.3, 118-123, 2003.
8.	Kenzo Asaoka and Masayuki Kon : Sintered porous titanium and titanium alloys as advanced biomaterials, Materials Science Forum, Vol.426-432, 3079-3084, 2003. (Link to Publication Site) ● Publication site (DOI): 10.4028/www.scientific.net/MSF.426-432.3079 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0038676298 (DOI: 10.4028/www.scientific.net/MSF.426-432.3079, Elsevier: Scopus)
9.	Takao Hanawa, S Hiromoto, Katsuhiko Asami and Kenzo Asaoka : Compositions of surface oxide films on titanium alloys regenerated in Hanks' solution, The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), 187-188, 2001.
10.	Kenzo Asaoka, Masayuki Kon, DU Park, A Toyama and T Araki : Sintered titanium compacts with biological function as biomaterials for hard tissue replacement, The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), 245-246, 2001.
11.	Mayumi Luciana Hirakata, Masayuki Kon, Tetsuya Yuasa, Youji Miyamoto and Kenzo Asaoka : Influences of crystal phases on bioactivity of calcium phosphate cements, Key Engineering Materials, Vol.218-220, 343-346, 2001.
12.	Kouichi Murakami, Hidemi Ukai, Takao Hanawa and Kenzo Asaoka : Development of Ca ion implanted titanium and its alloys for medical and dental applications, Titanium 95: Science and Technology, 1808-1815, 1996.
13.	Takao Hanawa, Kenzo Asaoka, Hidemi Ukai and Kouichi Murakami : Calcium phosphate precipitation on titanium and surface-modified titanium, Bioceramics, Vol.9, 297-300, 1996.
14.	Youji Miyamoto, Kunio Ishikawa, Masaaki Takechi, Masayuki Kon, Masaru Nagayama and Kenzo Asaoka : Soft tissue responses of calcium phosphate cements, Bioceramics, Vol.9, 263-266, 1996.
15.	Masaaki Takechi, Youji Miyamoto, Kunio Ishikawa, Masayuki Kon, Masaru Nagayama and Kenzo Asaoka : Basic properties of hydroxyapatite putty made with fast-setting calcium phosphate cement and sodium alginate, Bioceramics, Vol.9, 235-238, 1996.
16.	Kunio Ishikawa, Youji Miyamoto, Masaaki Takechi, Taketomo Toh, Masayuki Kon, Masaru Nagayama and Kenzo Asaoka : Approaches for bone-replacing calcium phosphate cement, --- Effect of NaHCO3 addition on the properties of calcium phosphate cement ---, Bioceramics, Vol.9, 255-258, 1996.
17.	Hidemi Ukai, Takao Hanawa, Kouichi Murakami and Kenzo Asaoka : Surface characterization of Ca²⁺ implanted titanium for biomaterials, Surface Modification Technologies VIII, 862-872, 1995.
18.	Takao Hanawa, Kenzo Asaoka, Hidemi Ukai and Kouichi Murakami : Calcium phosphate precipitation or titanium in electrolyte and its acceleration by calcium-ion implantation, Compatibility of Biomedical Implants, 126-137, 1994.
19.	Kenzo Asaoka, John Tesk and JR Kelly : Evaluation of fracture toughness and residual stress in dental porcelain by indentation-microfracture method, Proceedings of the 4th International Conference on Residual Stress (ICRS IV), 854-859, 1994.
20.	Kenzo Asaoka and Takao Hanawa : Thermal conduction of dental metal-ceramic composite at room and elevated temperatures and its compatibility, Proceedings of 1st International Conference on Composite Engineering (ICCE/1), 613-614, 1994.
21.	M Yamanaka, Kenzo Asaoka, Kenichi Yoshida and Kiyoshi Sakamaki : Acoustic emission behavior during heating/cooling of Pd-Cu alloys, Proceedings of the 11th International Acoustic Emission Symposium, 537-543, 1992.
22.	J Test, J Antonucci, J Stansbury, S Keeny, M Chiang, Y Matsuya, Kenzo Asaoka and J Tang : Propeties and interactions of oral structures and restorative materials, --- Part 3 Dental alloys, ceramics and metrology and analyses ---, NISTIR, Vol.92, No.4841, 86-107, 1992.
23.	Kenzo Asaoka and John Tesk : Effect of transformation of alloy on transient and residual stresses in a porcelain-metal strip, Residual Stress-III: Science and Technology, 626-631, 1992.
24.	John Tesk and Kenzo Asaoka : Residual stress in a porcelain-metal strip related to thermo-physical properties of materials, Residual Stress-III: Science and Technology, Vol.1, 146-150, 1992.
25.	Kenzo Asaoka : Marginal fracture mechanism of amalgam filling in the class I cavity, Proceedings of 7th International Conference on Biomedical Engineering, 315-317, 1992.
26.	Kenzo Asaoka : 陶材/合金補綴物の焼成条件と残留応力の関係, 日本機械学会講演論文集 E, Vol.900, No.59, 108-110, 1990.
27.	J Tesk, J Antonucci, G Brauer, W de Rijk, J Mckinney, J Stansbury, S Venz, S Lee, Akiyoshi Sugawara and Kenzo Asaoka : Properties and intercations of oral structures and restorative materials, --- Part 3 Dental alloys, ceramics and metrology ---, NISTIR, Vol.89, No.4048, 83-94, 1989.
28.	Kenzo Asaoka : 異種材料接合, バウンダリー, Vol.4, No.10, 25-27, 1988.
29.	J Tesk, J Antonucci, G Brauer, J Stansbury, S Venz, S Lee, W de Rijk, Akiyoshi Sugawara, Kenzo Asaoka and O Okuno : Properties and interactions of oral structures and restorative materials, --- Part 3 Dental alloys, ceramics and metrology ---, NBSIR, Vol.88, No.3782, 81-94, 1988.
30.	Kenzo Asaoka : コンピュータで風冷強化の原理を見る, バウンダリー, Vol.3, No.7, 64-66, 1987.
31.	Kenzo Asaoka : 金属, 金属, Vol.55, No.4, 47-49, 1985.
32.	Kenzo Asaoka : 結晶面の解析, 金属, Vol.55, No.4, 36-39, 1985.
33.	Kenzo Asaoka and 桑山則彦 : 硬組織代替用材料の生体力学的な適合性に関する研究, 日本機械学会講演論文集, Vol.835, No.1, 114-116, 1983.
34.	Kenzo Asaoka, 桑山則彦, 三浦維四, 奥野攻, 川原春幸, 中村正明 and 今井弘一 : チタン合金およびジルコニウム合金の医歯学的応用, バイオマテリアル学会大会論文集, Vol.5, 37-38, 1983.
35.	Kenzo Asaoka, 桑山則彦, 三浦維四, 奥野攻, 川原春幸 and 今井弘一 : チタン合金およびジルコニウム合金の医歯学的応用, バイオマテリアル学会大会論文集, Vol.4, 127-131, 1982.
36.	Kenzo Asaoka and 辻晃一郎 : 歯科用Ag-Pd-Cu系合金の時効硬化に及ぼす冷間加工の影響, バイオマテリアル学会大会論文集, Vol.3, 133-136, 1981.
37.	Kenzo Asaoka : 複合2相合金の組織と引張変形挙動に関する研究, 学位論文, 1981.
38.	Kenzo Asaoka and 三浦維四 : 2相合金の変形，破壊挙動, 金属, Vol.50, No.6, 10-14, 1980.
39.	Kenzo Asaoka : 計算機シミュレーション法の歯科への応用, 口腔病学会誌, Vol.41, No.4, 81, 1974.

Review, Commentary:

1.	Kenzo Asaoka : Analysis of material functions by thermal desorption spectroscopy, The Journal of Dental Engineering, No.163, 29-31, Oct. 2007.
2.	Kenzo Asaoka : 器官，組織，細胞，蛋白をターゲットとしたバイオマテリアル, バイオマテリアル, Vol.24, No.5, 295-296, Oct. 2006.
3.	Kenzo Asaoka : 歯科産業の活性化と材料研究の新たな展開, Journal of Japanese Society for Dental Products, Vol.19, No.2, 1, Dec. 2005.
4.	Kenzo Asaoka : Current status of medical and dental devices in clinics, Journal of Japanese Society for Biomaterials, Vol.22, No.4, 252-257, Jul. 2004. (Keyword) 歯科材料 / 移植器具 / 眼内レンズ / ペースメーカー / 人工関節 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1520853834638861696 (CiNii: 1520853834638861696)
5.	Kenzo Asaoka : 現代医療を支えるバイオマテリアル, 工業教育資料, No.292, 9-12, Nov. 2003. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1520291855476041856 (CiNii: 1520291855476041856)
6.	Kenzo Asaoka : 金属系バイオマテリアルの現状と将来展望, 科学と工業, Vol.74, No.5, 203-209, May 2000. (Keyword) titanium / 生体親和性 / 機能材料 / 表面修飾 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1520573330500259968 (CiNii: 1520573330500259968)
7.	Kenzo Asaoka : 生体融和材料開発のコンセプト (特集生体融和材料から組織再生工学), Boundary, Vol.16, No.3, 2-6, Mar. 2000. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1523106604709810048 (CiNii: 1523106604709810048)
8.	Kenzo Asaoka : 歯科材料，生体材料そして組織再生工学, Boundary, Vol.16, No.1, 3-6, Jan. 2000. (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1520854805710069632 (CiNii: 1520854805710069632)
9.	Fumiaki Kawano and Kenzo Asaoka : Selective rule of dental materials in dental clinic, Quintessence of Dental Technology YEAR BOOK, 146-150, 1999. (Keyword) 金属材料 / ceramics / ハイブリッド系材料
10.	Kenzo Asaoka : 力学的側面からみた歯科材料の疲労と寿命, The Journal of Dental Engineering, No.121, 9-12, 1997.
11.	Takao Hanawa and Kenzo Asaoka : イオン工学技術による生体用金属材料の表面改質, 生体材料, Vol.15, No.5, 249-258, 1997.
12.	Kenzo Asaoka : 鋳型の歯ぎしり, バウンダリー, Vol.11, No.7, 14-17, Jul. 1995.
13.	Takao Hanawa and Kenzo Asaoka : 歯科材料における表面処理, 表面技術, Vol.46, No.10, 898-902, 1995.
14.	Takao Hanawa and Kenzo Asaoka : 表面改質によるチタンの生体活性化, 生体材料, Vol.13, No.4, 178-183, 1995.
15.	Kenzo Asaoka : 充填材料の寿命推定へのアプローチアマルガムについて, Shikoku Dental Research, Vol.6, No.2, 127-136, 1993.
16.	Kenzo Asaoka and Norihiko Kuwayama : 材料プロセスのシミュレーション, Shikoku Dental Research, Vol.4, No.2, 101-111, 1991.
17.	Kenzo Asaoka : 歯科鋳造用合金と陶材との接合, Bulletin of the Japan Institute of Metals, Vol.28, No.2, 124-128, 1989.
18.	Ishi Miura, Osamu Okuno and Kenzo Asaoka : コンピュータ・シミュレーションと金属材料研究, Bulletin of the Japan Institute of Metals, Vol.17, No.10, 785-789, Oct. 1978.
19.	Ishi Miura, Hitoshi Hamanaka, Osamu Okuno and Kenzo Asaoka : 軽金属繊維強化材料に関する若干のコメントII, Journal of Japan Institute of Light Metals, Vol.25, No.5, 186-192, May 1975.
20.	Ishi Miura, Hitoshi Hamanaka, Osamu Okuno and Kenzo Asaoka : 軽金属繊維強化材料に関する若干のコメント1, Journal of Japan Institute of Light Metals, Vol.25, No.4, 147-158, Apr. 1975.

Proceeding of International Conference:

1.	Kenzo Asaoka : Dental materials to dental biomaterials, --- 'Nano bio' interfacing cells and tissues ---, ITREN 16th International Symposium, Vol.16, No., , Cheonan,
2.	Emi Takegawa, INUI Shihoko, Kenichi Hamada, Eiichi Honda, Kenzo Asaoka and Fumiaki Kawano : Microstructure of Magnetic-resonance-imaging Compatible Au-xPt-8Nb Alloy, 91st General Session and Exhibition of the International Association for Dental Research, Seattle, Mar. 2013.
3.	Kenichi Hamada, INUI Shihoko, Emi Takegawa, Eiichi Honda and Kenzo Asaoka : Magnetic-resonance-imaging Artifact-free Au 8Nb 5Pt Alloy: Mechanical Properties of Wire, 91st General Session and Exhibition of the International Association for Dental Research, Seattle, Mar. 2013.
4.	INUI Shihoko, IDA Yumika, Emi Takegawa, Kenichi Hamada, Eiichi Honda and Kenzo Asaoka : Properties of Au Pd Alloy for Magnetic-resonance-imaging Compatible Biomedical Devices, 91st General Session and Exhibition of the International Association for Dental Research, Seattle, Mar. 2013.
5.	Kenzo Asaoka : Dental materials to dental bio-materials, 慶北大学校歯科大学, Daegu, Dec. 2012.
6.	Kazumitsu Sekine, Kenichi Hamada, Jiyon Be, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : Evaluation of Strontium Introduced Apatite Cement for Injectable Bone Substitute Developments, ASEAN plus and Tokushima Joint International Conference, Yogyakarta, Dec. 2012.
7.	Kenzo Asaoka : Process simulation on dental porcelain veneering systems, Asian BioCeramics Symposium, Tainan, Nov. 2012.
8.	Kenzo Asaoka : Computer simulation on development of high performance phosphate-bonded investment, PER/IADR Congress & Exhibition, 32, Sep. 2012.
9.	Masahiro Hiasa, Masahiro Abe, Rieko Arakaki, Akiko Yamada, Kenzo Asaoka, Toshio Matsumoto, Yoshio Hayashi and Naozumi Ishimaru : RelB attenuates the activation of the classical NF-κB pathway to facilitate osteoblastogenesis, ANZBMS Annual Scientific Meeting, Perth, Sep. 2012.
10.	Kenzo Asaoka : Aging of dental biomaterials used in an oral cavity., Oral Materials Symposium, Tainan, Dec. 2011.
11.	Kazumitsu Sekine, Yambe Tomoyuki, Shiraishi Yasuyuki, Matsuki Hidetoshi, Sato Fumihiro, Maeda Tsuyoshi, Honma Dai and Kenzo Asaoka : Drinking Mechanism for the Development of the Artificial Esophagus, 38th Congress of the European Society for Artificial Organs and 4th Biennial Congress of the International Federation on Artificial Organs, Porto, Oct. 2011.
12.	Masahiro Hiasa, nakano ayako, Keiichiro Watanabe, C Qu, T Harada, Shiroh Fujii, Hirokazu Miki, Shingen Nakamura, Kumiko Kagawa, Kyoko Takeuchi, Eiji Tanaka, Kenzo Asaoka, Shuji Ozaki, Toshio Matsumoto and Masahiro Abe : Prevention of tumor growth and bone destruction in myeloma by Pim kinase inhibition., ASBMR 2011 Annual Meeting, San Diego, Sep. 2011.
13.	Masahiro Hiasa, nakano ayako, Keiichiro Watanabe, C Qu, T Harada, Shiroh Fujii, Hirokazu Miki, Shingen Nakamura, Kumiko Kagawa, Kyoko Takeuchi, Eiji Tanaka, Kenzo Asaoka, Shuji Ozaki, Toshio Matsumoto and Masahiro Abe : Dual effects of Pim inhibition on myeloma: induction of bone formation and tumor suppression., IOF-ANZBMS 2011 Annual Meeting, Gold Coast, Sep. 2011.
14.	Emi Takegawa, Shihoko Inui, Kenichi Hamada, Eiichi Honda and Kenzo Asaoka : MRI Compatible Au-Pt-Nb Alloy for Biomedical Applications, Thermec (International Conference on Processing & Manufacturing of Advanced Materials) 2011, Québec City, Aug. 2011.
15.	Kazumitsu Sekine, Kenichi Hamada, Emi Takegawa, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : In vitro and consistency evaluation of strontium apatite bone cement., 3rd International Symposium on Surface and Interface of Biomaterials, Sapporo, Jul. 2011.
16.	Kenzo Asaoka : Porosity of dental gypsum investments in setting and heating process, International Dental Materials Congress, Soule, May 2011.
17.	NS Kim, BJ Choi, SB Park, Kenzo Asaoka and HH Lee : Fracture toughness of 3Y-TZP ceramics sintered by microwave furnace, International Dental Materials Congress 2011, Seoul, May 2011.
18.	Jiyon Be, Kenichi Hamada, Hae-Hyoung Lee and Kenzo Asaoka : Porosity of dental gypsum products during setting and heating process, International Dental Materials Congress 2011, Seoul, May 2011.
19.	Kazumitsu Sekine, Kenichi Hamada, Emi Takegawa, Fumiaki Kawano and Kenzo Asaoka : In vitro and in vivo evaluation of strontium-substituted apatite bone cement, International Dental Materials Congress 2011, Seoul, May 2011.
20.	INUI Shihoko, Emi Takegawa, Kenichi Hamada, Eiichi Honda and Kenzo Asaoka : Castability of MRI Compatible Au Alloy for Biomedical Application, International Dental Materials Congress 2011, Seoul, May 2011.
21.	Emi Takegawa, Shihoko Inui, Kenichi Hamada, Eiichi Honda and Kenzo Asaoka : Microstructure of MRI Compatible Au-Pt-8Nb Alloy for Biomedical Application, International Dental Materials Congress 2011, Seoul, May 2011.
22.	Shinya Horiuchi, Kenzo Asaoka, Shinji Fujihara, Akihiro Yasue and Eiji Tanaka : Development of zinc-releasing apatite cement modified by zinc calcium phosphoate, 89th IADR, San Diego, Mar. 2011.
23.	Kenichi Hamada, Yoshihito Naitou, Daisuke Nagao, Yoritoki Tomotake, Tetsuo Ichikawa and Kenzo Asaoka : Properties of Porous Titanium using Moldless Process, International Joint Symposium on Oral Science, Denpasar, Dec. 2010.
24.	Kenzo Asaoka : Hydrogen related delayed fracture of medical and dental titanium devices, The 6th Asian Science Seminar in Taiwan, Tainan, Oct. 2010.
25.	Masahiro Hiasa, Masahiro Abe, nakano ayako, oda aska, amo hiroe, Keiichiro Watanabe, Shingen Nakamura, miki hirokazu, Kyoko Takeuchi, Kumiko Kagawa, Shuji Ozaki, Eiji Tanaka, Kenzo Asaoka and Toshio Matsumoto : Bone Marrow Stromal Cells Suppress TACE-mediated M-CSFR and RANK Shedding to Facilitate Osteoclastogenesis and Suppress DC Differentiation from Monocytes., ASBMR 2010 Annual Meeting, Toronto, Oct. 2010.
26.	Masahiro Hiasa, Masahiro Abe, Eiji Tanaka, Kenzo Asaoka and Toshio Matsumoto : Stroma inhibit DC differentiation through the suppression of M-CSFR shedding, 88th IADR, Barcelona, Jul. 2010.
27.	Kazumitsu Sekine, Kenichi Hamada, Emi Takegawa, Fumiaki Kawano, Kikuji Yamashita and Kenzo Asaoka : Biocompatibility Evaluation of Strontium-substituted Apatite Bone Cement, 88th General Session and Exhibition of the International Association for Dental Research, Barcelona, Jul. 2010.
28.	Emi Takegawa, Kenichi Hamada, Eiichi Honda and Kenzo Asaoka : Magnetic-susceptibility of Au-Pt-Nb Alloy for Magnetic-resonance-imaging Compatible Biomedical-devices, 88th General Session and Exhibition of the International Association for Dental Research, Barcelona, Jul. 2010.
29.	Masahiro Hiasa, Masahiro Abe, I Endo, A Nakano, Shuji Ozaki, Eiji Tanaka, Kenzo Asaoka and Toshio Matsumoto : Myeloma-bone marrow stromal cell interaction enhances osteoclastogenesis and suppresses dendritic cell differentiation from monocytes, 14th International Congress of Endocrinology, Kyoto, Mar. 2010.
30.	Kazumitsu Sekine, Kenichi Hamada, Emi Takegawa, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : Biocompatibility evaluation of Strontium-substituted apatite cement, 3rd Hiroshima Conference on Education and Science in Dentistry, Vol.3, No.1, 83, Hiroshima, Nov. 2009.
31.	Masahiro Hiasa, Masahiro Abe, A Nakano, Kyoko Takeuchi, K Watanabe, Kumiko Kagawa, Ken-ichiro Yata, Kenzo Asaoka, Eiji Tanaka and Toshio Matsumoto : Bone marrow stromal cells inhibit dendritic cell differentiation and facilitate osteoclastogenesis in myeloma through the suppression of M-CSF receptor shedding in monocytes, 第26回内藤コンファレンス, Nov. 2009.
32.	Kenichi Hamada, Yoshihito Naitou, Daisuke Nagao, Yoritoki Tomotake, Tetsuo Ichikawa and Kenzo Asaoka : Smart process of porous titanium for tailor-made medical and dental devices, Thermec (International Conference on Processing & Manufacturing of Advanced Materials) 2009, Berlin, Aug. 2009.
33.	Shinya Horiuchi, Kenzo Asaoka, Takashi Izawa, Shinji Fujihara, Nao Kinouchi, Shingo Kuroda and Eiji Tanaka : Development of novel bioceramic by modification of zinc phosphate cement, 87th IADR, Miami, Apr. 2009.
34.	Kenzo Asaoka : Porous titanium as bio-functional Biomaterials, international Symposium on Emerging Biomaterials in Tissue Engineering, Cheonan, Nov. 2008.
35.	Emi Fujihara, Kenichi Hamada, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : Preparation of biodegradable calcium phosphate cement using a-TCP with low crystallinity, The International Symopsium on Oral Science to Improve the Quality of Life, Tokushima, Sep. 2008.
36.	Maki Hosoki, Eiichi Bando, Kenzo Asaoka, M Kitamura, Hisahiro Takeuchi and Keisuke Nishigawa : Assessment of allergic hypersensitivity to dental materials, Nanotoxicology Assessment and Biomedical, Environmental Application of Fine Particles and Nanotubes (ISNT2008), Sapporo, Jun. 2008.
37.	Kenzo Asaoka and Motohiro Uo : Formation of fine particles related with mechanical degradation of Ni-Ti superelastic alloys in biological fluids, Nanotoxicology Assessment and Biomedical, Environmental Application of Fine Particles and Nanotubes (ISNT2008), Sapporo, Jun. 2008.
38.	Kenzo Asaoka and Kunimitsu Maejima : Analysis of water on titanium surface by thermal desorption spectroscopy, 8th World Biomaterials Congress, Amsterdam, Jun. 2008.
39.	Emi Fujihara, Fumiaki Kawano, Kenichi Hamada and Kenzo Asaoka : Resorbable calcium phosphate bone cement precipitated strontium and carbonate apatite, 8th World Biomaterials Congress, Amsterdam, May 2008.
40.	Kenichi Hamada, Eiichi Honda and Kenzo Asaoka : Properties of MRI-Artifact-Free Gold Alloy for Biomedical Application, 8th World Biomaterials Congress, Amsterdam, May 2008.
41.	Kenzo Asaoka : Hydrogen related degradation of mechanical properties of titanium and titanium alloys, 2nd Symposium on fracture and fracture of mrdical metallic materials and devices, Denver, May 2008.
42.	Yoshihito Naitou, Daisuke Nagao, Yoritoki Tomotake, Kenichi Hamada, Kenzo Asaoka and Tetsuo Ichikawa : Bioactivity of porous titanium prodeced by a newly developing moldless process, 2nd International Symposium and Workshop "The future Direction of Oral Sciences in the 21st Century", Tokushima, Dec. 2007.
43.	Emi Fujiwara, Fumiaki Kawano, Kenichi Hamada and Kenzo Asaoka : Incorporation of carbonate apatite into the strontium-substituted resorbable calcium phosphate bone cement, 2nd International Symposium and Workshop "The future Direction of Oral Sciences in the 21st Century", Tokushima, Dec. 2007.
44.	SH An, WJ Kim, Kenzo Asaoka, TY Kwon and Kyo-Han Kim : Heat-treated TiO2 nanotubes: Hydroxyapatite growth, International Dental Materials Congress 2007, 315, Bangkok, Nov. 2007.
45.	Kenzo Asaoka : Mechanism of delayed fracture of titanium implant in vivo, International Dental Materials Congress 2007, 158, Bangkok, Nov. 2007.
46.	Kenichi Hamada, Eiichi Honda and Kenzo Asaoka : MRI-Artifact-Free Gold Alloy for Biomedical Application, International Dental Materials Congress 2007, Bangkok, Nov. 2007.
47.	Emi Fujiwara, Fumiaki Kawano, Kenichi Hamada and Kenzo Asaoka : Solubility of Strontium and Carbonate-substituted Calcium Phosphate Bone Cement Mixed with SrCl2 Solution, International Dental Materials Congress 2007, Bangkok, Nov. 2007.
48.	Yoshihito Naitou, Kenichi Hamada, Daisuke Nagao, Yoritoki Tomotake, Tetsuo Ichikawa and Kenzo Asaoka : Bioactivity of porous titanium produced using moldless process, 6th International Symposium on Titanium in Dentistry, Kyoto, Jul. 2007.
49.	Emi Fujihara, Kenichi Hamada and Kenzo Asaoka : Effects of calcium concentration on hydrothermal surface modification of titanium, 6th International Symposium on Titanium in Dentistry, Kyoto, Jun. 2007.
50.	Kenichi Hamada, Yoshihito Naitou, Daisuke Nagao, Yoritoki Tomotake, Tetsuo Ichikawa and Kenzo Asaoka : Moldless Process of Producing Porous Titanium for Dental Applications, 6th International Symposium on Titanium in Dentistry, Kyoto, Jun. 2007.
51.	Kenzo Asaoka : Stress-corrosion cracking of titanium (Ti) implants by hydrogen absorption, Workshop on metallic corrosion of small implants, Norfolk, May 2007.
52.	Yoshihito Naitou, Daisuke Nagao, Tetsuo Ichikawa, Kenzo Asaoka and Kenichi Hamada : High formable porous titanium for biomedical applications, International Association for Dental Research, New Orleans, Mar. 2007.
53.	Yoshihito Naitou, Daisuke Nagao, Kenichi Hamada, Kenzo Asaoka and Tetsuo Ichikawa : High formability of newly developing biomedical porous titanium, 1st International Symposium and Workshop "The future Direction of Oral Sciences in the 21st Century", Awaji, Mar. 2007.
54.	Emi Fujiwara, Fumiaki Kawano, Kenichi Hamada and Kenzo Asaoka : Preparation of strontium-containing hydroxyapatite bone cements mixed with strontium, 1st International Symposium and Workshop "The future Direction of Oral Sciences in the 21st Century", Awaji, Mar. 2007.
55.	Kenzo Asaoka and Kunimitsu Maejima : Effect of surface oxide films on degradation of titanium, International Conference on Processing & Manufacturing of Advanced Materials (THERMEC 2006), Vancouver, Jul. 2006.
56.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : Effects of fiber-resin interface property on shape recovery and mechanical properties of denture-base-resin matrix smart composite, Thermec (International Conference on Processing & Manufacturing of Advanced Materials) 2006, Vancouver, Jul. 2006.
57.	Masayuki Kon, Kenichi Hamada, Fumiaki Kawano, Ken'ichi Yokoyama, Emi Fujiwara and Kenzo Asaoka : Improvement of thermal conductivity for glass-ionomer cement, International Association for Dental Research, Brisbane, Jun. 2006.
58.	Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka and J Sakai : Susceptability to hydrogen embrittlement of Ti-0.2Pd alloy in fluoride solutions, International Association for Dental Research, Brisbane, Jun. 2006.
59.	Emi Fujiwara, Masayuki Kon and Kenzo Asaoka : Development of calcium phosphate cement crystallized with strontium-containg apatite, International Association for Dental Research, Brisbane, Jun. 2006.
60.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : Fiber-matrix interface property effects on mechanical properties and shape recovery of NiTi shape memory alloy fiber / denture-base-resin matrix composites, 1st International Conference on Mechanics of Biomaterials & Tissues, Waikoloa, Hawaii, USA, Dec. 2005.
61.	Yuki Sakamoto, Kenzo Asaoka, Masayuki Kon, Toshio Matsubara and Kenichi Yoshida : Porous titanium compacts as biomaterials for hard tissue replacement, 4th International Conference on Porous Metals and Metal Foaming Technology, Kyoto, Sep. 2005.
62.	Kenzo Asaoka : Porous titanium compacts as advanced medical device, International Conference on Cellular Metals for Structural and Functional Applications, 18, Dresden, May 2005.
63.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : Fiber property effects on shape recovery of Ni-Ti alloy fiber embedded denture-base resin after smart repair, 7th World Biomaterials Congress, Sydney, May 2004.
64.	Kenzo Asaoka and Masayuki Kon : Sintered porous titanium and titanium alloys as advanced biomaterials, International Conference on Processing & Advanced Materials (THERMEC'2003), Madrid, Jul. 2003.
65.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : Shape recovery of Ni-Ti alloy fiber-reinforced denture base resin by smart repair process, Thermec (International Conference on Processing & Manufacturing of Advanced Materials) 2003, Madrid, Jul. 2003.
66.	Hirakata Mayumi Luciana, Masayuki Kon, Tetsuya Yuasa, Youji Miyamoto and Kenzo Asaoka : Evaluation of apatite ceramics containing a-tricalcium phosphate in the surface layer, Journal of Dental Research, Vol.82, No.Spec B, 336, Goteborg, Jun. 2003.
67.	Kazuyuki Kaneko, Ken'ichi Yokoyama, Keiji Moriyama and Kenzo Asaoka : Delayed fracture of beta titanium alloys in fluoride solutions, Journal of Dental Research, Vol.82, No.Spec B, 341, Goteborg, Jun. 2003.
68.	Ken'ichi Yokoyama, Kazuyuki Kaneko, Keiji Moriyama and Kenzo Asaoka : Degradation of tensile strength due to hydrogen absorption of nickel-titanium superelastic alloys in fluoride solution, Journal of Dental Research, Vol.82, No.Spec B, 341, Goteborg, Jun. 2003.
69.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : Deformation of Ni-Ti Alloy Fiber Embedded Denture Base Resin after Smart Repair, Journal of Dental Research, Vol.82, No.Spec B, 128, Goteborg, Jun. 2003.
70.	Kenzo Asaoka, Masayuki Kon, Kazuhito Satomura and Youji Miyamoto : Sintered porous titanium and Ti-6Al-4V alloys with calcium phosphate modification, Transactions of the Society for Biomaterials, Vol.28th Annual Meeting, 630, Tampa, Apr. 2002.
71.	Masayuki Kon, Kenzo Asaoka and Masahiro Kobayashi : High strength porcelains prepared with two types of zirconium-containing glass, Journal of Dental Research, Vol.81, No.Spec A, 469, San Diego, Mar. 2002.
72.	Ken'ichi Yokoyama, Kenichi Hamada and Kenzo Asaoka : Hydrogen embrittlement of Ni-Ti super-elastic alloys, Journal of Dental Research, Vol.81, No.Spec A, 262, San Diego, Mar. 2002.
73.	Mayumi Luciana Hirakata, Masayuki Kon and Kenzo Asaoka : Calcium phosphate cements prepared utilizing calcium carbonate whiskers, Journal of Dental Research, Vol.81, No.Spec A, 1424, San Diego, Mar. 2002.
74.	Kenzo Asaoka, Masayuki Kon, DU Park, A Toyama and T Araki : Sintered titanium compacts with biological function as biomaterials for hard tissue, The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), Honolulu, Dec. 2001.
75.	Takao Hanawa, S Hiromoto, Katsuhiko Asami and Kenzo Asaoka : Compositions of surface oxide films on titanium alloys regenerated in Hanks' solution, The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), Honolulu, Dec. 2001.
76.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : Smart Denture, Journal of Dental Research, Vol.80, No.Spec, 759, Chiba, Jun. 2001.
77.	Masayuki Kon, Kenzo Asaoka and Masahiro Kobayashi : Development of aluminum-free frits containing zirconium for glassy porcelain, Journal of Dental Research, Vol.80, No.Spec, 558, Chiba, Jun. 2001.
78.	Mayumi Luciana Hirakata, Masayuki Kon, Kenzo Asaoka, Youji Miyamoto and Masaaki Takechi : In vitro and in vivo reactions of compositional gradient bioceramics, Journal of Dental Research, Vol.80, No.Spec, 590, Chiba, Jun. 2001.
79.	Kenzo Asaoka, Masayuki Kon and DU Park : Novel titanium sintered compacts with biological function, Journal of Dental Research, Vol.80, No.Spec, 594, Chiba, Jun. 2001.
80.	Kenzo Asaoka, Masayuki Kon, DU Park, A Toyama and T Araki : Porous titanium compacts with calcium phosphate modification by spark plasma sintering, Transactions of the Society for Biomaterials, Vol.27th Annual Meeting & Exposition, 544, Saint Paul, Apr. 2001.
81.	Kenzo Asaoka and Ken'ichi Yokoyama : Hydrogen embitterment of Ni-Ti alloy in biological environment, TMS2001, Vol.130th Annual Meeting & Exhibition, 96, New Orleans, Feb. 2001.
82.	Ken'ichi Yokoyama, Kenichi Hamada and Kenzo Asaoka : Mechanical and electro-chemical properties of Co-based glassy alloy as biomaterials, Transactions of the 6th World Biomaterial Congress, 1271, Kamuera, May 2000.
83.	Masayuki Kon, Masahiro Kobayashi, Fumiaki Kawano and Kenzo Asaoka : Mechanical properties of glass-ionomer cements reinforced with various short glass-fibers, Transactions of the 6th World Biomaterial Congress, 749, Kamuera, May 2000.
84.	Masahiro Kobayashi, Masayuki Kon, Kenzo Asaoka and K Miyai : Strengthening of glass-ionomer cement by compounding short glass-fibers, Journal of Dental Research, Vol.79, No.Spec, 539, Washington, D.C., Apr. 2000.
85.	Fumiaki Kawano, Masayuki Kon, Masahiro Kobayashi and Kenzo Asaoka : Influence of thermo cycling on glass-ionomer cement reinforced with short glass-fiber, Journal of Dental Research, Vol.79, No.Spec, 539, Washington, D.C., Apr. 2000.
86.	Masayuki Kon, Kenzo Asaoka, J W O'Brien and ST Rasmussen : Concept for low-fusing glassy porcelains possessing high strength., Journal of Dental Research, Vol.79, No.Spec, 270, Washington, D.C., Apr. 2000.
87.	Mayumi Luciana Hirakata, Kenzo Asaoka and Kenichi Yoshida : Internal fracture of phosphate-bonded investment during mechanical tests, Journal of Dental Research, Vol.79, No.Spec, 547, Washington, D.C., Apr. 2000.
88.	Masayuki Kon and Kenzo Asaoka : Developmental concept for low-fusing porcelains possessing high fracture toughness, The 22th Asia Pacific Dental Congress, 129, Tokyo, Mar. 2000.
89.	Kenzo Asaoka, Kenichi Hamada and Ken'ichi Yokoyama : Novel functional alloys as biomaterials, International Workshop on Bio-integrated Materials & Tissue Engineering, Vol.Abstr, 21-22, Tsukuba, Jan. 2000.
90.	Masayuki Kon, Takao Hanawa, Kenichi Hamada and Kenzo Asaoka : Surface modified metal-based biomaterial systems and its tailoring, International Workshop on Bio-integrated Materials & Tissue Engineering, Vol.Abstr, 99-100, Tsukuba, Jan. 2000.
91.	Takao Hanawa, Katsuhiko Asami and Kenzo Asaoka : One mechanism of ion release from titanium into bioliquid, Transactions of the 3rd International Congress on Dental Materials, 358, Honolulu, Nov. 1997.
92.	Kyo-Han Kim, Y Sakamoto, Kenichi Yoshida and Kenzo Asaoka : Effect of composition on AE signals from gypsum-bonded investment, Transactions of the 3rd International Congress on Dental Materials, 139, Honolulu, Nov. 1997.
93.	Kunio Ishikawa, Kenzo Asaoka and Fumiaki Kawano : Effect of heating rate on thermal stress of gypsum-bonded investment, Transactions of the 3rd International Congress on Dental Materials, 141, Honolulu, Nov. 1997.
94.	Hae-Hyoung Lee, Masayuki Kon, Takao Hanawa, Fumiaki Kawano and Kenzo Asaoka : Thermo cycling of tempered feldspathic porcelain in water, Transactions of the 3rd International Congress on Dental Materials, 176, Honolulu, Nov. 1997.
95.	DG Kim, Kyo-Han Kim, Takao Hanawa and Kenzo Asaoka : Surface treatments of titanium in aqueous solutions, Transactions of the 3rd International Congress on Dental Materials, 184, Honolulu, Nov. 1997.
96.	Akihisa Urayama, Takao Hanawa, Kenzo Asaoka and Takashi Matsuo : Bacterial adhesion to saliva-coated titanium surface, Transactions of the 3rd International Congress on Dental Materials, 244, Honolulu, Nov. 1997.
97.	Shigeyuki Ebisu, T Yasunaga, Toshiyuki Suge, Akiko Kawasaki, Kunio Ishikawa, Kenzo Asaoka and Takashi Matsuo : Acid resistance of bovine enamel after calcium phosphate precipitation method using dogs, Journal of Dental Research, Vol.76, No.Special Issue, 180, Orlando, Mar. 1997.
98.	Akiko Kawasaki, Kunio Ishikawa, Toshiyuki Suge, Kenzo Asaoka, Takashi Matsuo and Shigeyuki Ebisu : Effects of plaque control on the occlusion of dentin tubules, Journal of Dental Research, Vol.76, No.Special Issue, 180, Orlando, Mar. 1997.
99.	Shinya Horiuchi, Kunio Ishikawa, S Tensin, Kenzo Asaoka and TT Yamamoto : Effects of Na2Si03 on the fluoridization of apatite powder, Journal of Dental Research, Vol.76, No.Spec, 214, Orlando, Mar. 1997.
100.	Kenji Oka, Takao Hanawa, Fumiaki Kawano, Masayuki Kon, Naoyuki Matsumoto and Kenzo Asaoka : Effect of barium in porcelain on bonding of titanium-porcelain system, Journal of Dental Research, Vol.76, No.Spec, 72, Orlando, Mar. 1997.
101.	Masaaki Takechi, Youji Miyamoto, Kunio Ishikawa, Kenzo Asaoka and Masaru Nagayama : Effects of antibiotics addition on the basic properties of nd-FSCPC, Journal of Dental Research, Vol.76, No.Spec, 242, Orlando, Mar. 1997.
102.	Youji Miyamoto, Kunio Ishikawa, Masaaki Takechi, Masayuki Kon, Kenzo Asaoka and Masaru Nagayama : Basic properties of calcium phosphate cement containing collagen, Journal of Dental Research, Vol.76, No.Spec, 243, Orlando, Mar. 1997.
103.	Hae-Hyoung Lee, Masayuki Kon, Takao Hanawa, Fumiaki Kawano and Kenzo Asaoka : Mechanical properties of porcelain containing leucite ion-exchanged by rubidium, Journal of Dental Research, Vol.76, No.Spec, 419, Orlando, Mar. 1997.
104.	Masayuki Kon, Hae-Hyoung Lee, Kunio Ishikawa, Youji Miyamoto and Kenzo Asaoka : Development of calcium phosphate cement for fast-transformation to apatite, Journal of Dental Research, Vol.76, No.Spec, 421, Orlando, Mar. 1997.
105.	Kunio Ishikawa, Youji Miyamoto, Masaaki Takechi, Masayuki Kon, Kenzo Asaoka and Masaru Nagayama : Basic properties and tissue response of hydroxyapatite putty, Journal of Dental Research, Vol.76, No.Spec, 150, Orlando, Mar. 1997.
106.	Toshiyuki Suge, Kunio Ishikawa, Akiko Kawasaki, Kenzo Asaoka, Takashi Matsuo and Shigeyuki Ebisu : Acid resistance of bovine enamel after calcium phosphate precipitation method, Journal of Dental Research, Vol.76, No.Special Issue, 97, Orlando, Mar. 1997.
107.	Kunio Ishikawa, Youji Miyamoto, Masaaki Takechi, Taketomo Toh, Masayuki Kon, Masaru Nagayama and Kenzo Asaoka : Approaches for bone-replacing calcium phosphate cement, --- Effect of NaHCO3 addition on the properties of calcium phosphate cement ---, Proceedings of the 9th International Symposium on Ceramics in Medicine, 255-258, Otsu, Nov. 1996.
108.	Kunio Ishikawa, Youji Miyamoto, Masayuki Kon and Kenzo Asaoka : Non-decay type fast setting calcium phosphate cement, The 2nd International Meeting of Pacific Rim Ceramic Societies, Cairns, Jul. 1996.
109.	Hidemi Ukai, Kouichi Murakami, Takao Hanawa and Kenzo Asaoka : Surface characterization of calcium-Ion mixing treated titanium in electrolyte, Transactions of the 5th World Biomaterial Congress, Vol.1, 964, Toronto, Jul. 1996.
110.	Takao Hanawa, Katsuhiko Asami, Hidemi Ukai, Kouichi Murakami and Kenzo Asaoka : Mechanism of improvement of bone conductivity in titanium by calcium-ion-implantation, Transactions of the 5th World Biomaterial Congress, Vol.2, 964, Toronto, May 1996.
111.	E Hayashi, Takao Hanawa, Kikuji Yamashita, Masaru Nagayama, Kenzo Asaoka, Seiichiro Kitamura, Hidemi Ukai and Kouichi Murakami : Observation of osteogenic cells on calcium-ion-mixing titanium using TEM, Journal of Dental Research, Vol.75, No.Spec, 396, San Francisco, Mar. 1996.
112.	Kikuji Yamashita, Takao Hanawa, E Hayashi, Seiichiro Kitamura, Kenzo Asaoka, Masaru Nagayama, Hidemi Ukai and Kouichi Murakami : Calcification formed by osteogenic cells cultured on calcium-ion-mixing titanium, Journal of Dental Research, Vol.75, No.Spec, 309, San Francisco, Mar. 1996.
113.	Toshiyuki Suge, Kunio Ishikawa, Akiko Kawasaki, Masahiro Yoshiyama, Kenzo Asaoka and Shigeyuki Ebisu : Calcium phosphate precipitation method using buffer for post-treatment solution, Journal of Dental Research, Vol.75, No.Special Issue, 279, San Francisco, Mar. 1996.
114.	Akiko Kawasaki, Kunio Ishikawa, Toshiyuki Suge, Masahiro Yoshiyama, Kenzo Asaoka and Shigeyuki Ebisu : Effects of calcium phosophate precipitation method on crystalinity of apatite, Journal of Dental Research, Vol.75, No.Special Issue, 279, San Francisco, Mar. 1996.
115.	Kunio Ishikawa, Youji Miyamoto, Masayuki Kon and Kenzo Asaoka : Behavior of non-decay-type fast- setting calcium phosphate cement, Journal of Dental Research, Vol.75, No.Spec, 21, San Francisco, Mar. 1996.
116.	Fumiaki Kawano, Kan Nagao, Takao Hanawa, Masayuki Kon, Kenzo Asaoka, A Koran and Naoyuki Matsumoto : Shock-absorbing behavior of soft liners as influenced by accelerated aging, Journal of Dental Research, Vol.75, No.Spec, 308, San Francisco, Mar. 1996.
117.	Kenzo Asaoka, Tomoyasu Matsuno and Takao Hanawa : Thermal diffusivity of gypsum-bonded investment in dental use, Journal of Dental Research, Vol.75, No.Spec, 63, San Francisco, Mar. 1996.
118.	Takao Hanawa, Fumiaki Kawano, Masayuki Kon, Kenji Oka, Yoritoki Tomotake, Kenzo Asaoka and Matsumoto Naoyuki : Estimation of residual stress of porcelain by laser Raman spectroscopy, Journal of Dental Research, Vol.75, No.Spec, 125, San Francisco, Mar. 1996.
119.	Kyo-Han Kim, Kouichi Esaki, Kenichi Yoshida and Kenzo Asaoka : Acoustic emission signals during thermal processing of gypsum-bonded investment, Journal of Dental Research, Vol.75, No.Spec, 63, San Francisco, Mar. 1996.
120.	Akihisa Urayama, Takao Hanawa, Hideaki Nakae, Kenzo Asaoka and Shigeyuki Ebisu : Bacterial adhesion to titanium and antibacterial effect of titanium ions, Proceedings of the Conference on Biomaterials in a Simulated Oral Environment, 105, San Diego, Nov. 1995.
121.	Takao Hanawa, Masayuki Kon, Hisashi Doi, Hitoshi Hamanaka and Kenzo Asaoka : Surface behavior of calcium-ion-implanted titanium in simulated bioliquid, Proceedings of the Conference on Biomaterials in a Simulated Oral Environment, 106, San Diego, Nov. 1995.
122.	Kouichi Murakami, Hidemi Ukai, Takao Hanawa and Kenzo Asaoka : Development of Ca ion implanted titanium and its alloys for medical and dental applications, 8th World Conference on Titanium, 66, Birmingham, Oct. 1995.
123.	Fumiaki Kawano, Kan Nagao, Masayuki Kon, Kenzo Asaoka, Naoyuki Matsumoto and A Koran : Cushioning effect of soft liners as influenced by lining method, Journal of Dental Research, Vol.74, No.Spec, 487, Singapore, Jun. 1995.
124.	Masayuki Kon, Fumiaki Kawano, Takao Hanawa and Kenzo Asaoka : Effect of glass compositions on strength of porcelain containing leucite, Journal of Dental Research, Vol.74, No.Spec, 489, Singapore, Jun. 1995.
125.	Kenji Oka, Yoritoki Tomotake, Fumiaki Kawano, Masayuki Kon and Kenzo Asaoka : Effect of ion exchange on Weibull parameter of dental porcelains, Journal of Dental Research, Vol.74, No.Spec, 489, Singapore, Jun. 1995.
126.	Toshiyuki Suge, Kunio Ishikawa, Akiko Kawasaki, Masahiro Yoshiyama, Kenzo Asaoka and Shigeyuki Ebisu : Duration of calcium phosphate precipitation method for dentinal tubules occlusion, Journal of Dental Research, Vol.74, No.Special Issue, 423, Singapore, Jun. 1995.
127.	Akiko Kawasaki, Kunio Ishikawa, Toshiyuki Suge, Masahiro Yoshiyama, Kenzo Asaoka and Shigeyuki Ebisu : Effecs of fluoride on CPP method for dentin hypersensitivity treatment, Journal of Dental Research, Vol.74, No.Special Issue, 423, Singapore, Jun. 1995.
128.	Shozo Takagi, Kunio Ishikawa, LC Chow, ND Sanin and Kenzo Asaoka : Formation of nonstoichiometric hydroxyapatite in cements, Journal of Dental Research, Vol.74, No.Spec, 242, San Antonio, May 1995.
129.	Hidemi Ukai, Takao Hanawa, Kouichi Murakami and Kenzo Asaoka : Surface characterization of Ca²⁺ implanted titanium for biomaterials, 8th International Conference on surface modification technology, Niece, Nov. 1994.
130.	Fumiaki Kawano, Masayuki Kon, Kenzo Asaoka and Naoyuki Matsumoto : Effect of crystallization on color and translucency of castable glass-ceramics, 3rd Biennial Meeting of the Asian Academy of Esthetic Dentistry, Kagoshima, Nov. 1994.
131.	Kenzo Asaoka and Takao Hanawa : Thermal conduction of dental metal-ceramic composite at room and elevated temperatures and its compatibility, Proceedings of lst International Conference on Composite Engineering, 613-614, New Orleans, Aug. 1994.
132.	Kenzo Asaoka, John Tesk and JR Kelly : Evaluation of fracture toughness and residual stress in dental porcelain by indentation-microfracture method, Proceedings of the 4th International Conference on Residual Stress, 854-859, Baltimore, Jun. 1994.
133.	Tkao Hanawa, Kenzo Asaoka, Hidemi Ukai and Kouichi Murakami : Calcium phosphate precipitation or titanium in electrolyte and its acceleration by calcium-ion implantation, Proceedings of the 185th Meeting of the Electrochemical Society, 126-137, San Francisco, May 1994.
134.	H Fukao, Youji Miyamoto, M Sawada, Masaru Nagayama, Masayuki Kon, Kunio Ishikawa and Kenzo Asaoka : In vivo reactions of functionally gradient ceramic calcium phosphate, 3rd World Congress for Oral Implantology, Yokohama, Apr. 1994.
135.	Fumiaki Kawano, Masayuki Kon, Kenzo Asaoka and A Koran : Shock-absorbing behavior of soft denture liners, Journal of Dental Research, Vol.73, No.Spec, 123, Seattle, Mar. 1994.
136.	Takao Hanawa, Kenzo Asaoka, Yohji Kamiura, Takao Kohgo, Akira Amemiya, Hidemi Ukai and Kouichi Murakami : Compatibility of osteogenic cells and rat tibia with calcium-ion-implanted titanium, Bionic Design Workshop '94, Tsukuba, Feb. 1994.
137.	Kenzo Asaoka and Fumiaki Kawano : Computer simulation on the marginal fracture of amalgam filling related to creep, Transactions of the 2nd International Congress on Dental Materials, 323, Honolulu, Nov. 1993.
138.	Masayuki Kon, Fumiaki Kawano, Kenzo Asaoka and Naoyuki Matsumoto : Effect of crystallization on strength of castable glass-ceramics, Transactions of the 2nd International Congress on Dental Materials, 149, Honolulu, Nov. 1993.
139.	T Tojo, Fumiaki Kawano, Kenichi Yoshida and Kenzo Asaoka : Temperature dependence of thermal properties of dental glass-ceramics, Transactions of the 2nd International Congress on Dental Materials, 227, Honolulu, Nov. 1993.
140.	John Tesk, JR Kelly, Kenzo Asaoka and DW Liu : Apparent fracture toughness as a method for the evaluation of dental ceramic/ceramic-metal systems, 19th Annual Meeting of the Society for Biomaterials, Birmingham, Apr. 1993.
141.	Kenichi Yoshida and Kenzo Asaoka : Acoustic emission behavior during firing of dental porcelain-fused-to-metal strip, 3rd SAMPE International Congress on Advanced Materials, Chiba, 1993.
142.	Kenzo Asaoka : Marginal fracture mechanism of amalgam filling in the class I cavity, Proceedings of the 7th International Conference on Biomedical Engineering, 315-317, Singapore, Dec. 1992.
143.	John Tesk and Kenzo Asaoka : Residual stress in porcelain-metal system: Effect of thermal expansion in the glass transition region, International Association for Dental Research, Vol.71, No.Spec, 238, Boston, Mar. 1992.
144.	John Tesk and Kenzo Asaoka : Residual stress in a porcelain-metal strip related to thermo-physical properties of materials, 3rd International Conference on Residual Stress, Tokushima, Jul. 1991.
145.	Kenzo Asaoka and John Tesk : Effect of transformation of alloy on transient and residual stresses in a porcelain-metal strip, 3rd International Conference on Residual Stress, Tokushima, Jul. 1991.
146.	Toshihiko Miki, Kenzo Asaoka, Norihiko Kuwayama and Terushige Kawata : Finite element analysis for the mobility of individual teeth in an axial direction, Transactions of the International Congress on Dental Materials, 424-425, Honolulu, Nov. 1989.
147.	Kenzo Asaoka : Thermal expansion of palladium based alloy as a function of composition, International Association for Dental Research, Vol.68, No.Spec, 302, San Francisco, Mar. 1989.
148.	Kenzo Asaoka and John Tesk : Transient and residual stress in dental porcelain fused -to-metal restorations as affected by the thermal expansion coefficients of the alloy, Transactions of the 3rd World Biomaterials Congress, 518, Kyoto, Apr. 1988.
149.	Kenzo Asaoka and John Tesk : Transient and residual stress in porcelain-metal strip, International Association for Dental Research, Vol.67, No.Spec, 264, Montreal, Mar. 1988.
150.	Kenzo Asaoka and John Tesk : Residual stress in dental porcelain related to cooling rate, International Association for Dental Research, Vol.66, No.Spec, 279, Chicago, Mar. 1987.
151.	Kenzo Asaoka : Correlation of thermal transient stress with compatibility data for porcelain/alloy system, International Association for Dental Research, Vol.65, No.Spec, 217, Washington, D.C., Mar. 1986.

Proceeding of Domestic Conference:

1.	Kazumitsu Sekine, Kikuji Yamashita and Kenzo Asaoka : Srイオン徐放体を含有したリン酸カルシウム系セメントの基礎的性質, 第50回日本人工臓器学会大会, Nov. 2012.
2.	Masahiro Hiasa, Masahiro Abe, Kumiko Kagawa, Hirokazu Miki, Shingen Nakamura, Harada Takeshi, Fujii Shirou, Keiichiro Watanabe, Ryota Amachi, Kenzo Asaoka and Toshio Matsumoto : Pim-2 acts as a common downstream mediator to suppress bone formation in myeloma., 第74回に本血液学会, Oct. 2012.
3.	Ji-Young Bae and Kenzo Asaoka : Effect of colloidal silica concentration on porosity of the set and burnout phosphate bonded investment compacts, The Journal of the Japanese Society for Dental Materials and Devices, Vol.31, No.5, 483, Oct. 2012. (Keyword) phosphate-bonded investment / Porosity / colloidal silica
4.	Shihoko Inui, Emi Takegawa, Kenichi Hamada and Kenzo Asaoka : 医療用非磁性Au-Pd基合金の開発:Au-Pd合金の磁化率と機械的特性, 第60回日本歯科理工学会学術講演会, Oct. 2012.
5.	Emi Takegawa, Shihoko Inui, Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : Au-Pt合金の磁化率への組成，加工および熱処理の影響, 第60回日本歯科理工学会学術講演会, Oct. 2012.
6.	Masahiro Hiasa, Masahiro Abe, Rieko Arakaki, Akiko Yamada, Kenzo Asaoka, Toshio Matsumoto, Yoshio Hayashi and Naozumi Ishimaru : RelB antagonizes the classical NF-κB pathway and its suppression of osteoblastogenesis, 第30回日本骨代謝学会, Jul. 2012.
7.	Kazumitsu Sekine, Bae Young Ji, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : Newly developed bone cement introducing Strontium consistencies for bone regenerative substitute, 第51回日本生体医工学会大会, May 2012.
8.	Masahiro Hiasa, Rieko Arakaki, Akiko Yamada, Ritsuko 徳永律子 Oura, Masahiro Abe, Toshio Matsumoto, Yoshio Hayashi, Naozumi Ishimaru and Kenzo Asaoka : A novel role of NF-B relB in bone remodeling., 第40回日本免疫学会学術集会, Nov. 2011.
9.	Emi Takegawa, Kenichi Hamada, Eiichi Honda and Kenzo Asaoka : 生体用非磁性 AuPtNb 合金への第4元素の添加, 第33回日本バイオマテリアル学会大会, Nov. 2011.
10.	Kenichi Hamada, Emi Takegawa, Eiichi Honda and Kenzo Asaoka : 生体用非磁性 AuPtNb 合金を構成する 2 相の特性, 日本金属学会2011年秋季大会, Nov. 2011.
11.	Emi Takegawa, Shihoko Inui, Kenichi Hamada and Kenzo Asaoka : 非磁性Au-Pt-8Nb合金の鋳造性評価, 第58回日本歯科理工学会学術講演会, Oct. 2011.
12.	Masahiro Hiasa, Masahiro Abe, 中野綾子, Kyoko Takeuchi, Kumiko Kagawa, Shingen Nakamura, Hirokazu Miki, Eiji Tanaka, Kenzo Asaoka, Ken-ichiro Yata and Toshio Matsumoto : Pimキナーゼ阻害による腫瘍進展と骨破壊の抑制, 第73回日本血液学会, Oct. 2011.
13.	Masahiro Hiasa, A Nakano, Keiichiro Watanabe, C Qu, T Harada, S Fujii, H Miki, S Nakamura, K Kagawa, K Takeuchi, Eiji Tanaka, Kenzo Asaoka, Shuji Ozaki, Toshio Matsumoto and Masahiro Abe : Prevention of tumor growth and bone destruction in myeloma by Pim kinase inhibition, Bone Biology Forum, 19-21st Aug, 2011, Shizuoka., Aug. 2011.
14.	Masahiro Hiasa, Masahiro Abe, 中野綾子, Keiichiro Watanabe, Shingen Nakamura, Eiji Tanaka, Kenzo Asaoka and Toshio Matsumoto : Pimキナーゼの阻害は骨芽細胞分化を促進し，骨髄腫骨病変の形成と腫瘍進展を抑制する, The Annual Meeting of the Japanese Society for Bone and Mineral Research Program & Abstracts, 178, Jul. 2011.
15.	Maki Hosoki, Toyoko Satsuma, Keisuke Nishigawa, Hisahiro Takeuchi and Kenzo Asaoka : A Useful and Non-invasive Microanalysis Method for Dental Restoration Materials, SIB2011, Jul. 2011.
16.	Kazumitsu Sekine, Yambe Tomoyuki, Shiraishi Yasuyuki, Sato Fumihiro, Matsuki Hidetoshi, Maeda Tsuyoshi and Kenzo Asaoka : Structural improvement and evaluation of peristaltic actuation artificial esophagus using shape memory alloy fiber., 第50回日本生体医工学会大会, Apr. 2011.
17.	Kazumitsu Sekine, Kenichi Hamada, Emi Takegawa, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : Bone conductivity and regeneration evaluation of Strontium-substituted apatite bone cement., 第50回日本生体医工学会大会, Apr. 2011.
18.	Kenzo Asaoka : State of the art on micro-nano metal particles, The Journal of the Japanese Society for Dental Materials and Devices, Vol.30, No.2, 6, Apr. 2011. (Keyword) nanoparticles
19.	Kouji Kodama, Kenzo Asaoka, Hideo Nishino and Kenichi Yoshida : リン酸塩系埋没材の密度と気孔率に関する研究, 第16回四国地区材料関連学協会支部・研究会連合講演会講演概要集, Vol.16, 1-2, Mar. 2011.
20.	Masahiro Hiasa, Masahiro Abe, 中野綾子, Keiichiro Watanabe, Shingen Nakamura, Eiji Tanaka, Kenzo Asaoka and Toshio Matsumoto : Pimキナーゼの阻害は骨芽細胞分化を促進し，骨髄腫骨病変の形成と腫瘍進展を抑制する, The Annual Meeting of the Japanese Society for Bone and Mineral Research Program & Abstracts, 178, 2011. (Keyword) 癌原遺伝子蛋白質(拮抗物質・阻害物質); 骨芽細胞; 骨疾患(病因,実験的); 骨髄腫(合併症,実験的); 細胞分化; Protein-Serine-Threonine Kinases(拮抗物質・阻害物質) / Mouse Pim2 Protein(拮抗物質・阻害物質) / マウス; 動物
21.	Emi Takegawa, Kenichi Hamada, Eiichi Honda and Kenzo Asaoka : 生体用非磁性AuPtNb合金の磁化率, 第32回日本バイオマテリアル学会大会, Nov. 2010.
22.	Kazumitsu Sekine, Kenichi Hamada, Emi Takegawa, Fumiaki Kawano, Kikuji Yamashita and Kenzo Asaoka : ストロンチウム添加型アパタイトセメントの骨置換能評価, 第48回日本人工臓器学会大会, Vol.39, No.2, 131, Nov. 2010.
23.	Kazumitsu Sekine, 白石泰之, 山家智之, 松木英敏, 佐藤文博, 前田剛 and Kenzo Asaoka : 形状記憶合金ファイバーを人工筋肉とした消化管蠕動運動補助アクチュエータの開発, 第48回日本人工臓器学会大会, Vol.39, No.2, 56, Nov. 2010.
24.	Kazumitsu Sekine, Kenichi Hamada, Emi Takegawa, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : ストロンチウム(Sr)含有型アパタイトセメントのin vitro及びin vivo評価, 第56回日本歯科理工学会学術講演会, Vol.29, No.5, 385, Oct. 2010.
25.	Emi Takegawa, Kenichi Hamada and Kenzo Asaoka : 生体用非磁性AuPtNb合金の体積磁化率と機械的特性, 第56回日本歯科理工学会学術講演会, Oct. 2010.
26.	Kenichi Hamada, Emi Takegawa, Eiichi Honda and Kenzo Asaoka : 生体用非磁性AuPtNb合金の体積磁化率, 日本金属学会2010年秋季大会, Sep. 2010.
27.	Masahiro Hiasa, Masahiro Abe, 中野綾子, 小田明日香, 天羽宏枝, Kyoko Takeuchi, Kumiko Kagawa, Shingen Nakamura, 三木浩和, Ken-ichiro Yata, Keiichiro Watanabe, Shuji Ozaki, Kenzo Asaoka, Eiji Tanaka and Toshio Matsumoto : Bone marrow stromal cells supress TACE activity in monocytes to induce osteoclastogenesis, 第72回日本血液学会, Sep. 2010.
28.	Masahiro Hiasa, Masahiro Abe, Toshio Matsumoto and Kenzo Asaoka : 骨髄間質細胞は単球のTACE活性を抑制し樹状細胞分化を抑制し破骨細胞分化を誘導する, 第3回ナノ・バイオメディカル学会大会, Sep. 2010.
29.	Shinya Horiuchi, Masahiro Hiasa, Nao Kinouchi, Akihiro Yasue, Kenichi Hamada, Kenzo Asaoka and Eiji Tanaka : リン酸亜鉛カルシウムを添加した亜鉛徐放性アパタイトセメントの開発, 日本矯正歯科学会大会プログラム・抄録集, 208, Sep. 2010.
30.	Masahiro Hiasa, Masahiro Abe, 中野綾子, 小田明日香, 天羽宏枝, Kyoko Takeuchi, Kumiko Kagawa, Shingen Nakamura, 三木浩和, Ken-ichiro Yata, Keiichiro Watanabe, Shuji Ozaki, Kenzo Asaoka, Eiji Tanaka and Toshio Matsumoto : 骨髄間質細胞は，単球のTACE活性を抑制し樹状細胞分化を抑制し破骨細胞文化を誘導する, 第28回日本骨代謝学会, Jul. 2010.
31.	Kazumitsu Sekine, Uyama Emi, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : In vitro and in vivo evaluation of Strontium-substituted apatite bone cement., The 49th Annual Conference of Japanese Society for Medical and Biological Engineering, Vol.48, No.S1, 319, Jun. 2010.
32.	Kazumitsu Sekine, Shiraishi Yasuyuki, Yambe Tomoyuki and Kenzo Asaoka : Structure studies for improving the efficiency of an artificial peristaltic esophagus using a shape memory alloy fiber., The 49th Annual Conference of Japanese Society for Medical and Biological Engineering, Vol.48, No.S1, 322, Jun. 2010.
33.	Kouhei Tsukada, Hirokazu Kanda, Hideo Nishino, Kenzo Asaoka and Kenichi Yoshida : 歯科用埋没材の硬化反応，加熱膨張と気孔生成に関する研究, 第15回四国地区材料関連学協会支部・研究会連合講演会講演概要集, Vol.15, 15-16, Mar. 2010.
34.	Masahiro Hiasa and Kenzo Asaoka : ニッケルチタン合金の腐食とその生体為害性, 第2回 Nano Biomedicine, Feb. 2010.
35.	Shinya Horiuchi, Masahiro Hiasa, Hiroko Mori, Kenichi Hamada, Kenzo Asaoka and Eiji Tanaka : ボンディング前処理剤がセルフエッチングプライマーを用いるダイレクトボンディングに与える影響について, 第68回日本矯正歯科学会学術大会, Nov. 2009.
36.	Kenichi Hamada, Emi Takegawa, Eiichi Honda and Kenzo Asaoka : MRIアーチファクトフリー生体用AuPtX合金の特性, 第31回日本バイオマテリアル学会大会, Nov. 2009.
37.	Kazumitsu Sekine, Kenichi Hamada, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : 早期骨置換能を目指したストロンチウム含有アパタイトセメントの生体内反応評価と骨置換能評価, 第47回日本人工臓器学会大会, Vol.38, No.2, 123, Nov. 2009.
38.	Emi Takegawa, Kenichi Hamada and Kenzo Asaoka : MRIアーチファクトフリー生体用合金の研究(第2報)-AuPt基合金の機械的特性-, 第54回日本歯科理工学会学術講演会, Oct. 2009.
39.	Kenichi Hamada, Emi Takegawa, Eiichi Honda and Kenzo Asaoka : 生体用非磁性AuPtX合金の機械的特性, 日本金属学会2009年秋季大会, Sep. 2009.
40.	Motohiro Uo, Kenzo Asaoka, Kiyotaka Asakura and Fumio Watari : XAFS analysis of the corrosion products of Ni-Ti alloy, The Nano Biomedical Society, Jul. 2009.
41.	Kazumitsu Sekine, 藤原江美, Kenichi Hamada, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : 生体吸収性ストロンチウム含有アパタイトセメントの試作, 第48回日本生体医工学会大会, Vol.47, No.S1, 254, Apr. 2009.
42.	Kazumitsu Sekine, 山家智之, 白石泰之, 西條芳文, 佐藤文博, 松木英敏, 前田剛, 中澤文雄 and Kenzo Asaoka : コイル状形状記憶合金を応用した消化管蠕動運動アクチュエータの耐久性に関する検討, 第48回日本生体医工学会大会, Vol.47, No.S1, 188, Apr. 2009.
43.	Kazumitsu Sekine, Kenichi Hamada, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : ストロンチウム含有アパタイトセメントの生体反応性評価, 第53回日本歯科理工学会学術講演会, Vol.28, No.2, 108, Apr. 2009.
44.	Kazumitsu Sekine, 山家智之, 白石泰之, 西條芳文, 前田剛, 中澤文雄 and Kenzo Asaoka : 形状記憶合金を駆動力とした人工食道の開発研究 ∼"咀嚼"の先にある嚥下機能の補助デバイスとして∼, 第22回歯科チタン学会, Feb. 2009.
45.	Kazumitsu Sekine, 山家智之, 白石泰之, 西條芳文 and Kenzo Asaoka : 形状記憶合金ファイバーを用いた消化管蠕動運動補助アクチュエータの耐久性評価, 第46回日本人工臓器学会大会, Nov. 2008.
46.	Yoshihito Naitou, Kenichi Hamada, Kenzo Asaoka and Tetsuo Ichikawa : モールドレス成形および焼成可能なポーラスチタンの開発, 日本バイオマテリアル学会シンポジウム2008, Nov. 2008.
47.	FUJIHARA Emi, Kazumitsu Sekine, Kenichi Hamada, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : ストロンチウム含有アパタイトセメント存在下での骨芽細胞様細胞の培養, 日本バイオマテリアル学会シンポジウム2008, Nov. 2008.
48.	Kenichi Hamada, Eiichi Honda and Kenzo Asaoka : 生体用非磁性金-白金基合金の開発, 日本バイオマテリアル学会シンポジウム2008, Nov. 2008.
49.	Masahiro Hiasa, Masahiro Abe, 竹内恭子, Ken-ichiro Yata, Kumiko Kagawa, 三木浩和, Shuji Ozaki, Kenzo Asaoka and Toshio Matsumoto : 骨髄間質細胞は単球のM-CSFR発現を増強し単球由来樹状細胞分化を抑制し骨髄腫細胞による破骨細胞分化を促進する, 日本骨代謝学会・学術総会, Oct. 2008.
50.	Kenichi Hamada, Eiichi Honda and Kenzo Asaoka : 生体用非磁性金-白金合金の特性, 日本金属学会2008年秋季大会, Sep. 2008.
51.	Kenichi Hamada, 藤原江美 and Kenzo Asaoka : 水酸化カルシウム溶液中で高温水熱処理したチタンのアパタイト析出能, 第52回日本歯科理工学会学術講演会, Sep. 2008.
52.	藤原江美, Kazumitsu Sekine, Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 高溶解型ストロンチウム含有アパタイトセメントの細胞毒性評価, 第52回日本歯科理工学会学術講演会, Sep. 2008.
53.	Shinya Horiuchi, Masahiro Hiasa, Emi Kawakami, Shinji Fujihara, Kenzo Asaoka and Eiji Tanaka : Development of a new biomaterial applying the apatite transformed from water setting zinc phosphate cement, 第67回日本矯正歯科学会学術大会, Sep. 2008.
54.	Masahiro Hiasa, Masahiro Abe, Kenzo Asaoka and Toshio Matsumoto : inhibition of osteoclastgenesis by ectodomain shedding of M-CSF receptor, 17, Aug. 2008.
55.	Emi Fujihara, Kazumitsu Sekine, Kenichi Hamada, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : Properties of strontium-substituted apatite cement, 第17回硬組織再生生物学会学術大会, 52, Aug. 2008.
56.	Kenichi Hamada, FUJIHARA Emi and Kenzo Asaoka : Hydrothermal surface modification of titanium in Ca(OH)2 solution., 第17回硬組織再生生物学会学術大会, 40, Aug. 2008.
57.	Kenzo Asaoka : 医用ステント合金の腐食と寿命, 日本金属学会中国四国支部講演大会, Aug. 2008.
58.	Kenzo Asaoka : Ni-Ti超弾性合金の劣化と腐食生成物, 第22回日本歯科産業学会・学術講演会, Jul. 2008.
59.	Masahiro Hiasa and Kenzo Asaoka : TI合金の腐食と免疫応答, 歯科チタン学会, Feb. 2008.
60.	Emi Fujiwara, Fumiaki Kawano, Kenichi Hamada and Kenzo Asaoka : Preparation of strontium-substituted carbonate cement with high solubility, 第29回日本バイオマテリアル学会, 349, Nov. 2007.
61.	Kenzo Asaoka and Kunimitsu Maejima : Surface characterization of titanium, 第29回日本バイオマテリアル学会, 223, Nov. 2007.
62.	金村篤謙, Ken'ichi Yokoyama, Kenzo Asaoka and Junichi Sakai : 過酸化水素含有生理食塩水中におけるNi-Ti超弾性合金の耐食性の向上, 日本金属学会2007年秋季大会, Sep. 2007.
63.	長岡彬, Ken'ichi Yokoyama, Kenzo Asaoka and Junichi Sakai : Ti及びNi-Ti合金の表面改質に伴う水素吸収の評価, 日本金属学会2007年秋季大会, Sep. 2007.
64.	Miho Tomita, Ken'ichi Yokoyama, Kenzo Asaoka and Junichi Sakai : Ni-Ti超弾性合金の水素吸収と昇温放出挙動に及ぼす繰返し変形の影響, 日本金属学会2007年秋季大会, Sep. 2007.
65.	Yoshihito Naitou, Kenichi Hamada, Tetsuo Ichikawa and Kenzo Asaoka : モールドレス成形および焼成したチタン多孔体の基礎的評価, 第49回日本歯科理工学会学術講演会, May 2007.
66.	FUJIHARA Emi, Fumiaki Kawano, Kenichi Hamada and Kenzo Asaoka : ストロンチウム含有炭酸アパタイトセメントの溶解性, 第49回日本歯科理工学会学術講演会, May 2007.
67.	Kenichi Hamada and Kenzo Asaoka : MRIアーチファクトフリー生体用合金の研究(第1報)-候補合金と基礎的評価-, 第49回日本歯科理工学会学術講演会, May 2007.
68.	Emi Fujiwara, Masayuki Kon and Kenzo Asaoka : リン酸カルシウムセメント中へのストロンチュウムアパタイトの導入, 日本バイオマテリアル学会大会予稿集, Vol.28, Nov. 2006.
69.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第13報)-界面特性の解析-, 第48回日本歯科理工学会学術講演会, Oct. 2006.
70.	Kenzo Asaoka : 10年後の歯科医療への提言, 日本歯科理工学会近畿・中四国支部夏期セミナー, Aug. 2006.
71.	Yuji Hayashi, Kenichi Yoshida and Kenzo Asaoka : チタン粉末の比表面積とアパタイト修飾特性に関する研究, Journal of Japanese Society for Dental Products, Vol.20, No.1, 57, Jul. 2006.
72.	Yuki Sakamoto, Hidetaka Sezaki, Kenichi Yoshida and Kenzo Asaoka : チタンの熱処理，腐食と機械的性質に関する研究, Journal of Japanese Society for Dental Products, Vol.20, No.1, 56, Jul. 2006.
73.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維を埋め込んだ床用レジンの諸特性, 第21回日本歯科産業学会・学術講演会, Jul. 2006.
74.	Ken'ichi Yokoyama and Kenzo Asaoka : Hydrogen absorption of titanium alloys during long-term immersion in neutral fluoride solution, The Journal of the Japanese Society for Dental Materials and Devices, Vol.25, No.2, 174, Apr. 2006.
75.	Masayuki Kon, Kenichi Hamada, Fumiaki Kawano, Ken'ichi Yokoyama, Emi Fujiwara and Kenzo Asaoka : Properties of ZnO-containing glass ionomer cements, The Journal of the Japanese Society for Dental Materials and Devices, Vol.25, No.2, 156, Apr. 2006.
76.	Masayuki Kon, Kenichi Hamada, Fumiaki Kawano, Ken'ichi Yokoyama, 藤原江美 and Kenzo Asaoka : 酸化亜鉛含有型グラスアイオノマーセメントの諸性質, 第47回日本歯科理工学会学術講演会, Apr. 2006.
77.	Emi Fujiwara, Masayuki Kon and Kenzo Asaoka : Development of strontium-containing apatite cement, The Journal of the Japanese Society for Dental Materials and Devices, Vol.25, No.2, 99, Apr. 2006.
78.	高島克利, Ken'ichi Yokoyama, Kenzo Asaoka and 酒井潤一 : 中性NaF水溶液中におけるcp-Tiの水素吸収に及ぼす電位碑化の影響, 日本金属学会第138回大会, Mar. 2006.
79.	Ken'ichi Yokoyama, 高島克利 and Kenzo Asaoka : Ni-Ti超弾性合金の水素脆化ー大気中放置による水素濃度分布の変化, 日本金属学会第138回大会, Mar. 2006.
80.	Kenzo Asaoka : チタンと水素, Journal of Society for Titanium Alloys in Dentistry, Vol.4, No.1, 39, Jan. 2006.
81.	Kenzo Asaoka and Kunimitsu Maejima : Thermal desorption spectroscopy of hydrogen related with titanium surface oxide films, Annual Meeting of the Japanese Society for Biomaterials, Vol.27, 123, Nov. 2005.
82.	Kenzo Asaoka : Functional design in metallic-biomaterials, Annual Meeting of the Japanese Society for Biomaterials, Vol.27, 85, Nov. 2005.
83.	Shinya Horiuchi, Masayuki Kon, Kenzo Asaoka and Keiji Moriyama : リン酸亜鉛セメント硬化体のアパタイト置換を応用した新しいバイオマテリアルの開発, 第64回日本矯正歯科学会大会, Oct. 2005.
84.	藤田篤, Ken'ichi Yokoyama, Kenzo Asaoka and 酒井潤一 : 過酸化水素を含有した生理食塩水中におけるNi-Ti超弾性合金の腐食挙動, 日本金属学会第137回大会, Sep. 2005.
85.	Ken'ichi Yokoyama, 佐藤良介, 高島克利, Kenzo Asaoka and 酒井潤一 : 純Tiのフレッティング疲労に及ぼすハイドロキシアパタイトの影響, 日本金属学会第137回大会, Sep. 2005.
86.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第12報)-繊維表面金メッキの影響-, 第46回日本歯科理工学会学術講演会, Sep. 2005.
87.	Kenzo Asaoka : チタン多孔体とアパタイト修飾, Journal of Japanese Society for Dental Products, Vol.19, No.1, 74, Aug. 2005.
88.	Ken'ichi Yokoyama and Kenzo Asaoka : Susceptbility to hydrogen embrittlement of Ti-6Al-4V alloy in fluoride solutions, The Journal of the Japanese Society for Dental Materials and Devices, Vol.24, No.2, 180, Apr. 2005.
89.	Masayuki Kon, Shinya Horiuchi, Keiji Moriyama and Kenzo Asaoka : リン酸亜鉛セメントのアパタイト置換, The Journal of the Japanese Society for Dental Materials and Devices, Vol.24, No.2, 67, Apr. 2005.
90.	Yuki Sakamoto, Kenzo Asaoka and Kenichi Yoshida : Chemical surface modification of porous titanium compacts and its strength, The Journal of the Japanese Society for Dental Materials and Devices, Vol.24, No.2, 91, Apr. 2005.
91.	Hidetaka Sezaki, Kenzo Asaoka and Kenichi Yoshida : Corrosion of titanium in acidulated phosphate fluoride solution and protection by annealing, The Journal of the Japanese Society for Dental Materials and Devices, Vol.24, No.2, 88, Apr. 2005.
92.	Kenzo Asaoka, Kunimitsu Maejima and Hidetaka Sezaki : Effect of surface oxide films on degradation of titanium, The Journal of the Japanese Society for Dental Materials and Devices, Vol.24, No.2, 79, Apr. 2005.
93.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第11報)-プライマーの種類による界面特性の差異-, 第45回日本歯科理工学会学術講演会, Apr. 2005.
94.	是永圭太, 小川登志男, Ken'ichi Yokoyama, Kenzo Asaoka and 酒井潤一 : フッ化ナトリウム水溶液中におけるNi-Ti超弾性合金の水素吸収抑制, 日本金属学会第136回大会, Mar. 2005.
95.	Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka and Junichi Sakai : 過酸化水素水を含有した生理食塩水中におけるNi-Ti超弾性合金の破壊, 日本金属学会第136回大会, Mar. 2005.
96.	Yuki Sakamoto, Kenichi Yoshida, Kenzo Asaoka and Toshio Matsubara : Strength and chemical apatite coating on porous titanium compacts by spark plasma sintering, 日本機械学会講演論文集, No.055-1, 73-74, Mar. 2005.
97.	Hidetaka Sezaki, Kenichi Yoshida and Kenzo Asaoka : Effect of acidulated phosphate fluoride solution on mechanical properties of annealed titanium, 日本機械学会講演論文集, No.055-1, 71-72, Mar. 2005.
98.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 繊維-レジン界面特性が損傷修復型義歯床の形状回復に与える影響, 日本金属学会2004年秋季大会, Sep. 2004.
99.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第10報)-界面特性の影響-, 第44回日本歯科理工学会学術講演会, Sep. 2004.
100.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第9報)-昇温時の形状回復挙動-, 第43回日本歯科理工学会学術講演会, Apr. 2004.
101.	Kenzo Asaoka, Masayuki Kon, Kenichi Hamada and Ken'ichi Yokoyama : チタンインプラントの破壊寿命の推定, Journal of Society for Titanium Alloys in Dentistry, Vol.2, No.1, 46, Feb. 2004.
102.	Kenzo Asaoka : Modeling simulation of graded function in biomaterials, Proceedings of the 15thSymposium on Functionally Graded Materials, Nov. 2003.
103.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 埋入NiTi合金繊維の特性が損傷修復型義歯床の形状回復に与える影響, 日本金属学会2003年秋季大会, Oct. 2003.
104.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第8報)-超弾性繊維の効果-, 第42回日本歯科理工学会学術講演会, Sep. 2003.
105.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 義歯床用レジン基スマート複合材料の損傷修復後の形状変化に対する予歪の影響, 日本機械学会2003年度年次大会, Aug. 2003.
106.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第7報)-繊維予歪の影響-, 第41回日本歯科理工学会学術講演会, Apr. 2003.
107.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 損傷修復型スマート床義歯の開発, 日本金属学会2002年秋季大会, Nov. 2002.
108.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維を埋入した義歯床用レジン基複合材料の損傷修復後の形状変化, 日本機械学会2002年度年次大会, Sep. 2002.
109.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第6報)―繊維体積率が損傷修復後の形状変化に及ぼす影響―, 第40回日本歯科理工学会学術講演会, Aug. 2002.
110.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第5報)―加熱重合レジン基試料の損傷修復―, 第39回日本歯科理工学会学術講演会, Apr. 2002.
111.	中尾雅英, Kikuji Yamashita, Hiroyuki Morimoto, Kenichi Hamada, Kenzo Asaoka, Seiichiro Kitamura and Tetsuo Ichikawa : チタン表面のリン酸カルシウム形成能を調節する因子, 徳島生物学会第108回総会, 12, Nov. 2001.
112.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第4報)―曲げ破壊後の損傷修復―, 第38回日本歯科理工学会学術講演会, Oct. 2001.
113.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化義歯床の損傷修復機能, 日本複合材料学会2001年度研究発表講演会, Jun. 2001.
114.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第3報)―損傷修復への形状回復温度の影響―, 第37回日本歯科理工学会学術講演会, Mar. 2001.
115.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第2報)―損傷修復機能―, 第36回日本歯科理工学会学術講演会, Oct. 2000.
116.	Kenichi Hamada, Fumiaki Kawano and Kenzo Asaoka : 形状記憶合金繊維強化レジン基スマート複合材料の研究(第1報)―力学特性の変化―, 第35回日本歯科理工学会学術講演会, Apr. 2000.
117.	Masayuki Kon, Kenzo Asaoka and Mayumi Luciana Hirakata : SPS焼結チタン多孔体の骨伝導能の評価, Journal of Society for Titanium Alloys in Dentistry, Vol.1, No.1, 23, Feb. 2000.
118.	Kenzo Asaoka and Masayuki Kon : SPS焼結チタン合金多孔体の機械的性質と表面修飾, Journal of Society for Titanium Alloys in Dentistry, Vol.1, No.1, 22, Feb. 2000.
119.	Kenichi Hamada, 多田弘幸, Kenzo Asaoka, 細田秀樹 and Inoue Kanryu : Niフリーの新Ti基形状記憶·超弾性合金, 第20回日本バイオマテリアル学会, Nov. 1998.
120.	Kenichi Hamada, Kenzo Asaoka and 多田弘幸 : Niフリーの新Ti基形状記憶·超弾性合金, 第31回日本歯科理工学会学術講演会, Apr. 1998.
121.	Akiko Kawasaki, Kunio Ishikawa, Toshiyuki Suge, Kenzo Asaoka, Takashi Matsuo and Shigeyuki Ebisu : Effect of apatite forming method on the crystallinity of hydroxyapatite powder, Transaction of the 12 th Symposium on apatite, 6-7, Dec. 1996.
122.	Toshiyuki Suge, Kunio Ishikawa, Akiko Kawasaki, Kenzo Asaoka, Takashi Matsuo and Shigeyuki Ebisu : Apatite forming method -duration of dentinal tubules occlusion-, Transactions of the 12th Symposium on apatite, 4-5, Dec. 1996.
123.	Toshiyuki Suge, Kunio Ishikawa, Akiko Kawasaki, Kenzo Asaoka, Takashi Matsuo and Shigeyuki Ebisu : A new treatment method for dentin hypersensitivity -apatite forming method-, Transactions of the 12th Symposium on apatite, 2-3, Dec. 1996.

Et cetera, Workshop:

1.	Kazumitsu Sekine, Kikuji Yamashita, Fumiaki Kawano and Kenzo Asaoka : ストロンチウム徐放性リン酸カルシウムセメントに関する検討, 第24回代用臓器・再生医学研究会シンポジウム, Jan. 2012.
2.	Masahiro Hiasa, Masahiro Abe, 中野綾子, Keiichiro Watanabe, Kyoko Takeuchi, Kumiko Kagawa, Hirokazu Miki, Shingen Nakamura, Shiroh Fujii, 原田武志, Shuji Ozaki, Eiji Tanaka, Kenzo Asaoka and Toshio Matsumoto : Pimキナーゼの阻害による骨髄腫の進展抑制, 癌と骨病変研究会, Nov. 2011.
3.	Masahiro Hiasa, Masahiro Abe, 中野綾子, 小田明日香, 天羽宏枝, Kyoko Takeuchi, Kumiko Kagawa, Shingen Nakamura, 三木浩和, Ken-ichiro Yata, Keiichiro Watanabe, Shuji Ozaki, Kenzo Asaoka, Eiji Tanaka and Toshio Matsumoto : 骨髄間質細胞は，単球のTACE活性を抑制し樹状細胞分化を抑制し破骨細胞文化を誘導する, 第17回徳島骨代謝研究会, Nov. 2010.
4.	Kenzo Asaoka : Biocompatible materials for implants and medical devices., Otago University, Mar. 2009.
5.	Kenzo Asaoka : Transient and residual stresses in the porcelain veneering systems: Processing simulation of the dental porcelain firing procedure, Otago University, Mar. 2009.
6.	Kenzo Asaoka : Experimental and theoretical basis of rapid heating investments for dental metal casting, Otago University, Mar. 2009.
7.	Kenzo Asaoka : 歯冠修復，骨代替，脈管系治療のための金属材料, 材質制御研究会ー歯科材料を中心とした生体材料開発の最前線ー, Dec. 2008.
8.	Kenzo Asaoka : 歯科鋳造理論の歴史とハイテク技術の可能性, クローバー会, Dec. 2008.
9.	Masahiro Hiasa and Kenzo Asaoka : TI合金の腐食と免疫応答, 平成20年度厚生労働省科学研究費補助金化学物質リスク研究事業「ナノ微粒子の体内動態可視化法の開発」平成20年度第2回班会議, Feb. 2008.
10.	Kenzo Asaoka, Motohiro Uo and Fumio Watari : Hydrogen absorption and formation of particles in saline, ナノトキシコロジーアセスと微粒子・ナノチューブのバイオ応用研究会, Vol.5, 29, Dec. 2007.
11.	Kenzo Asaoka, Kenichi Hamada and Emi Fujiwara : Chemical surface modification and characterization of bio-compatibility of titanium, 「ナノトキシコロジーアセスと微粒子・ナノチューブのバイオ応用」研究会, Vol.4, Aug. 2007.
12.	Kenzo Asaoka : 生体内のチタンと水素, 材料における水素有効利用研究会, Vol.18, 27, Dec. 2006.
13.	Kenzo Asaoka : アパタイト修飾マイクロチタン粒子の開発, ナノトキシコロジーアセスと微粒子・ナノチューブのバイオ応用研究会, Jun. 2006.
14.	Kenzo Asaoka : チタン摩耗粉・微粒子と体内動態, ナノ微粒子の体内動態可視化法の開発, May 2006.
15.	Kenzo Asaoka : 金属系バイオマテリアルの機能設計, 歯科における産学連携, Mar. 2006.
16.	Kenzo Asaoka and Kunimitsu Maejima : チタンと水素, ナノトキシコロジーアセスと微粒子・ナノチューブのバイオ応用研究会, 30, Dec. 2005.

Patent:

1.	Kenichi Hamada, Eiichi Honda, Kenzo Asaoka and Midori Yoshida : Alloy for Medical Use and Medical Device, 13/392,905 (Sep. 2014), US8,821,566 B2 (Sep. 2014).
2.	Kenichi Hamada, Eiichi Honda, Kenzo Asaoka and Midori Yoshida : 医療用合金及び医療用具, 2010-547531 (Aug. 2014), 5598922 (Aug. 2014).
3.	Kenichi Hamada, Eiichi Honda, Kenzo Asaoka and Midori Yoshida : 医療用合金及び医療用具, PCT/JP2010/050789 (Jan. 2010), US8,821,566 B2 (Sep. 2014).
4.	Kenichi Hamada, Eiichi Honda, Kenzo Asaoka and Midori Yoshida : 医療用合金及び医療用具, PCT/JP2010/050789 (Jan. 2009), .
5.	Kenichi Hamada, Eiichi Honda, Kenzo Asaoka and Midori Yoshida : 医療用合金及び医療用具, 2009-013725 (Jan. 2009), .

Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)

The development of taylor-made materials with biomedical function. (Project/Area Number: 17390521 )
Estimation of osteointegration for calcium phosphate materials by immersion in simulated body fluid (Project/Area Number: 13672040 )
Development of Calcium Phosphate Cement for Rapid Crystallization to Apatite. (Project/Area Number: 09671993 )
生体疑似環境におけるチタン表面酸化皮膜の修復および再生皮膜の構造と性質 (Project/Area Number: 09671992 )
アパタイトブラスト法によるチタンのアパタイトコーティング方法に関する研究 (Project/Area Number: 07807180 )
Development of Functionally Gradient Bioceramics Producing with Acid Treatment (Project/Area Number: 07672115 )
Elucidation of surface properties of calcium-ion-implanted titanium in biological systems (Project/Area Number: 07672114 )
Studies on the tissue response to fast-setting calcium phosphate cement (Project/Area Number: 07557274 )
傾斜機能バイオセラミックス多孔体の試作と生体内反応 (Project/Area Number: 06671955 )
COMPUTER SIMULATION ON MATERIAL PROCESSING OF DENTAL RESTORATIONS (Project/Area Number: 04404075 )
Residual Stress in Porcelain-fused-to-Metal Restorations as Affected by Cooling Rate. (Project/Area Number: 62570878 )
Search by Researcher Number (50014189)

Professor Emeritus : Asaoka, Kenzo

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Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)