Job shadowing for early undergraduate dental students: Validation of educational effectiveness using structural equation modeling

This study aimed to evaluate and validate the educational effectiveness of a job shadowing class as a dental teaching programme for preclinical dental students through a questionnaire that assessed related student perceptions. A total of 124 preclinical (second year) dental students at Tokushima University participated in job shadowing placements from 2017 to 2019. Each student observed dental practice or surgery for 1 day in the university hospital. After shadowing, the students were requested to fill out a nine-item questionnaire based on a five-point scale. The first analysis was performed to calculate the correlation for each item. Furthermore, regression analysis for the categorical data was performed to show the relationship between eight questions (Items 1-8) and one question (Item 9: comprehensive evaluation). Next, factor analysis was performed to determine students' perceptions regarding the shadowing class. Ninety-eight students (response rate: 79%) completed the questionnaire. There was a strong relationship amongst Items 1, 8 and 9 ("interested in dentistry as a job," "learning motivation" and "comprehensive evaluation" respectively) based on the results of the correlation and regression analysis. The factor analysis led to three student perceptions as latent factors, namely, "Interesting," "Self-awareness" and "Future Goal," which had a relatively close inter-factor correlation (0.465-0.772). The finding suggests that job shadowing may increase a students' interest in a dentistry career at an early stage of their education and learning motivation, along with generating self-awareness. This programme may present possible educational effectiveness in dental education.


Sleep Quality and Comfort Reported by Sleep Bruxism Individuals Wearing the Occlusal Splint and Mandibular Advancement Splint: Revisiting Two Crossover Studies

To assess (1) whether the occlusal splint (OS) or mandibular advancement splint (MAS) allowed the best quality of sleep and was most comfortable; and (2) the relationship of sleep quality and comfort with the reduction in rhythmic masticatory muscle activity (RMMA) related to sleep bruxism (SB). Polysomnographic data of 21 SB subjects (25.6 ± 4.5 years), collected in two previous studies, were compared. Morning self-report data on sleep quality and comfort of the oral device, polysomnographic data, and RMMA index data from no-device nights were compared to data from nights using an OS or MAS. The reduction ratio of the RMMA index was calculated with the OS and the MAS. A responder to the oral device was identified when the RMMA index was less than 2, and when there was a reduction of at least 50% from the no-device night. Sleep quality reports on comfort of the oral device showed a mild advantage to the OS when compared to the MAS (r = 0.47, r = 0.32: P .01, respectively). The MAS induced a greater reduction on the RMMA index (P = .03) than the OS in responders. In the short term, the comfort of an oral device seemed to influence sleep quality in SB individuals. Despite the slightly higher degree of comfort offered by the OS, the MAS induced a greater effect on RMMA index.

The International Journal of Prosthodontics


Possibility and Future of Intraoral Scanner Application to Change the Method of Taking Impressions


Relationship between oral parafunctional and postural habits and the symptoms of temporomandibular disorders: A survey-based cross-sectional cohort study using propensity score matching analysis

Temporomandibular disorders (TMDs) are a multifactorial joint disease of the masticatory system. The possible etiological factors involved in the onset and progression of TMDs include oral parafunctional habits (OPFHs) and postural habits (PHs). However, little information is available on the association between OPFHs and PHs and a predisposition to TMDs. Thus, to investigate whether the presence of OPFH and PH predisposes individuals to TMDs, a survey-based cross-sectional cohort study of self-reported TMD was performed. A total of 2292 patients with TMD were recruited for the survey. Through one-to-one propensity score matching, 166 patients with and without sleep bruxism (SB) were selected. The SB group had a significantly higher risk of masticatory muscular pain or fatigue than the non-SB group ( = 0.018). Furthermore, the SB group without other OFPHs and PHs did not show a significantly higher risk of TMD symptoms than the non-SB group. Diurnal clenching and bad posture also affect the stomatognathic system, causing pain or fatigue; however, it did not result in TMDs in patients without any OPFHs and PHs. This implies that OPFHs and PHs may increase the risk of TMD symptoms in coexistence with other habits.


Oral appliances reduce masticatory muscle activity-sleep bruxism metrics independently of changes in heart rate variability.

Sleep bruxism (SB) is associated with physiological activities including sympathetic autonomic system dominance and sleep micro-arousal. While oral appliances (OA) are used to prevent SB harmful effects, the influence of OAs physiological mechanisms during sleep is unknown. The aim of this study is to assess whether heart rate variability (HRV) changes, as a marker of autonomic nervous system activity, would be associated with the OA mechanism of action on SB using occlusal splint (OS) and mandibular advancement splint (MAS). A retrospective analysis, from data previously collected in 21 participants with SB (25.6 ± 4.5 years) with polysomnographic recordings, was done. HRV data were compared between a reference night (no-device) and ones during which OS or MAS was used in a crossover study design. Rhythmic masticatory muscle activity (RMMA) index was compared between nights. HRV was evaluated using autoregressive model analysis for three sections: baseline (distance from RMMA), immediately before, and after RMMA period. A significant reduction in RMMA index, when wearing OA during sleep, was observed (P < 0.01), but was not associated with HRV parameters change. HRV significantly changed after RMMA onset for nights with OA during non-REM sleep in comparison with baseline (P < 0.02). The usage of OAs for SB participants reduced RMMA, but most likely independently of changes in HRV linked to the mechanism associated with SB genesis. Wearing OA seems to reduce grinding noise and protect from dental injuries but does not seem to influence SB genesis.


後期高齢者の口腔状態と要介護認定または死亡発生との関連性

後期高齢者の口腔状態と要介護認定または死亡発生との関連性


Comparison of Four Types of Airway Management Simulator in Tracheal Intubation

心肺蘇生教育に用いる気道管理シミュレータ4種類の気管挿管手技における比較

The Journal of Japanese Dental Education Association

日本歯科医学教育学会雑誌


Data on bond strength of resin cement systems to CAD/CAM resin composite after aging

CAD/CAM resin composite crowns are inexpensive tooth-colored prostheses that have been widely used. However, bonding between CAD/CAM resin composites and resin cements could be difficult since the resin composite is highly cross-linked. There is limited existing data on the resin cements' bond strength with different monomers to CAD/CAM resin composites. In this study, CAD/CAM resin composite was bonded to an SUS rod with three different resin cements following treatment of the bonding surface using the manufacturer's recommended primer. After storing the specimens in water at 37 °C for 24 h, half of them were tested immediately and half were thermocycled for 10,000 cycles in water for a dwell time of 20 s at 5 and 55 °C. The means of the tensile bond strength and standard deviations were determined for each resin cement and testing condition. The data were compared using two-way ANOVA and Bonferroni's multiple comparison tests at 95% confidence level.


Effects of zirconia additives on β-tricalcium-phosphate cement for high strength and high injectability


Evaluation of the measurement precision and accuracy in the dental CAD/CAM system

The purpose of this study is to investigate the precision and trueness of the occlusal contact record obtained with a dental CAD/CAM device (ARCTICA). Sandblasted spherical steel balls with diameters of 10-20 mm were measured using ARCTICA and a three-dimensional measurement device (FN503). The radius of each steel ball was calculated from the measured value and the difference between the measured and nominal values was obtained. Upper/lower dental arch casts were measured and processed for occlusal contact image creation using both devices. The graphical images of the occlusal contacts at the intercuspal position obtained from both systems and an occlusal analysis device (BE-1) were compared with the occlusal contact area. Excellent correlation was observed between the measurement results of ARCTICA and FN503 (p<0.001, R: 0.99). The occlusal contact areas were 186.0 mm (ARCTICA), 192.8 mm (FN503), and 196.1 mm (BE-1). This study showed that ARCTICA is capable of conducting highly accurate measurements and generating a graphical image of occlusal contacts with good reliability.


食道がん化学療法患者に対するがん支持療法としての専門的口腔ケアの有用性

食道がん化学療法患者に対するがん支持療法としての専門的口腔ケアの有用性


一次性および二次性舌痛症患者における睡眠障害の検討—睡眠質問票を用いた調査—

一次性および二次性舌痛症患者における睡眠障害の検討—睡眠質問票を用いた調査—


Quality of life and job satisfaction among female dentists in Japan


Educational effects using a robot patient simulation system for development of clinical attitude

The aim of this study was to assess the effectiveness of improving the attitude of dental students towards the use of a full-body patient simulation system (SIMROID) compared to the traditional mannequin (CLINSIM) for dental clinical education. The participants were 10 male undergraduate dental students who had finished clinical training in the university hospital 1 year before this study started. They performed a crown preparation on an upper pre-molar tooth using SIMROID and CLINSIM as the practical clinical trials. The elapsed time for preparation was recorded. The taper of the abutment teeth was measured using a 3-dimensional shape-measuring device after this trial. In addition, a self-reported questionnaire was collected that included physical pain, treatment safety and maintaining a clean area for each simulator. Qualitative data analysis of a free format report about SIMROID was performed using text mining analysis. This trial was performed twice at 1-month intervals. The students considered physical pain, treatment safety and a clean area for SIMROID significantly better than that for CLINSIM (P < .01). The elapsed time of preparation in the second practical clinical trial was significantly lower than in the first for SIMROID and CLINSIM (P < .01). However, there were no significant differences between the abutment tapers for both systems. For the text mining analysis, most of the students wrote that SIMROID was similar to real patients. The use of SIMROID was proven to be effective in improving the attitude of students towards patients, thereby giving importance to considerations for actual patients during dental treatment.


Relationship between Frontal/Lateral Mandibular Translations and Masticatory Movement Based on Evaluation of Occlusal Surface Motion

Objective: This study aimed to clarify whether crown restorations with adjusted occlusal surfaces that were formed using frontal/lateral mandibular translations, functioned without interference during mastication.
Materials and Methods: In 10 adult volunteers who had healthy normal dentition, frontal and lateral border movement was measured during unilateral mastication and free mastication, using an ultrasound digital mandibular measuring system (ARCUS digma2). Additionally, precise impressions of the upper and lower dental arch were taken, and dental casts were made. These casts were measured using a CAD/CAM scanning system (ARCTICA). For the fabrication of crown restorations, the functionally generated path technique (FGP technique) was used on the monitor for the lower first and second molar. The movement of the opposite teeth on the occlusal surface during frontal and lateral border movement, during unilateral mastication, and during free mastication was considered the functional occlusal surface. The data of the functional occlusal surface generated by frontal/lateral mandibular translations and that of each of the masticatory functional occlusal surfaces were superimposed using three-dimensional data evaluation software (GOM). The difference between these surfaces was evaluated to determine the interference area, maximum interference difference, and average interference difference.
Results: Interference was present for all functional occlusal surfaces created by mastication as well as those determined by frontal/lateral mandibular translations. The average interference values, in order of free masticatory movement, habitual masticatory side, and non-habitual masticatory side, were as follows. Interference area: 167.5 ± 20.8 mm2, 121.9 ± 28.5 mm2, 144.6 ± 28.0 mm2; maximum interference distance: 345.0 ± 43.1 m, 189.0 ± 39.9 m, 309.0 ± 46.8 m; average interference distance: 130.0 ± 15.7 m, 64.0 ± 10.6 m, 130.0 ± 21.9 m. Statistically significant differences were found for the maximum interference distance and average interference distance (both p < 0.05).
Conclusions: The functional occlusal surfaces for each form of mastication demonstrated interference with the functional surface of frontal/lateral mandibular translations. Thus, crown restorations of which the occlusal surfaces were adjusted and formed by frontal/lateral mandibular translations may interfere with mastication.


咬合違和感の診断と対処法

咬合違和感の診断と対処法


Evaluation of School Dental Checkups in the Tokushima University Hospital Training Curriculum : Results of Questionnaire Survey for 10 Years

臨床研修プログラムにおける学校歯科健康診断研修の評価 10年間のアンケート結果から

日本歯科医学教育学会雑誌


Effects of powder-to-liquid ratio on properties of β-tricalcium-phosphate cements modified using high-energy ball-milling

The authors have developed a β-tricalcium-phosphate (β-TCP) powder modified mechano-chemically through the application of a ball-milling process (mβ-TCP). The resulting powder can be used in a calcium-phosphate-cement (CPC). In this study, the effects of the powder-to-liquid ratio (P/L ratio) on the properties of the CPCs were investigated, and an appropriate P/L ratio that would simultaneously improve injectability and strength was clarified. The mβ-TCP cement mixed at a P/L ratio of 2.5 and set in air exhibited sufficient injectability until 20 min after mixing, and strength similar to or higher than that mixed at a P/L ratio of 2.0 and 2.78. Although the mβ-TCP cements set in vivo and in SBF were found to exhibit a lower strength than those set in air, it did have an appropriate setting time and strength for clinical applications. In conclusion, P/L ratio optimization successfully improved the strength of injectable mβ-TCP cement.


Analysis of the educational effect of OSCE performed at the college of dental hygienist course

歯科衛生士養成校におけるOSCE導入の教育学的効果に関する解析

The Journal of Japan Society of Dental Hygiene Education

日本歯科衛生教育学会雑誌


妊娠期の歯周状態と低体重児出産のリスクに関する観察研究

妊娠期の歯周状態と低体重児出産のリスクに関する観察研究


Intraoral Ultrasonography of Tongue Mass Lesions

To demonstrate the usefulness of intraoral ultrasonography (IOUS) for tongue mass lesions, we analyzed surgery cases excluding squamous-cell carcinoma and leukoplakia and compared IOUS and pathological findings. We used the hospital information system and Radiology Information System to evaluate the IOUS and pathological findings of patients who underwent surgeries for tongue masses in the past 11 years. Surgeries for the tongues were performed in 268 cases. Imaging examinations were carried out in 52 (19.4%) cases including 42 (15.7%) cases by IOUS. The pathological results of the surgeries were as follows: 36 cases were inflammatory lesions, 74 cases were tumours, 131 cases were hyperplasia, 8 cases were cystic lesions and 19 cases were other miscellaneous lesions. On the other hand, the number of patients who received IOUS in the same period was 87, and 42 of them had surgeries. In 32 out of the 42 (76.2%) cases, pre-operative IOUS features matched with pathological results. Most of the haemangiomas and lipomas could be diagnosed by IOUS alone. IOUS of the tongue revealed the nature of the lesions including the border, size, location, depth, the presence or absence of a capsule and the internal structure including vascularity of the mass. The ultrasonographic findings well reflected the histological findings. IOUS is a simple and useful technique that provides additional information beyond inspection, clarifying the internal structure, blood flow and relationships with the adjacent tissues. In this article, we indicated 11 representative cases (fibrous polyp, haemangioma, pyogenic granuloma, lipoma, liposarcoma, chondroma, lymphangioma, schwannoma, neurofibroma, pleomorphic adenoma and amyloidosis) to show the usefulness of IOUS.


Effects of perioperative oral management in thoracoscopic lung lobectomy : Retrospective study

胸腔鏡下肺葉切除術における周術期口腔機能管理の効果に関する検討―後ろ向き研究―


Effects of high-energy ball-milling on injectability and strength of β-tricalcium-phosphate cement

Calcium phosphate cement (CPC) offers many advantages as a bone-substitution material. The objective of this study is to develop a new CPC that simultaneously exhibits fine injectability, a short setting time, and high strength. β-tricalcium phosphate (β-TCP, control) powder was ball-milled for 24h to produce a new cement powder. The modified β-TCP after 24h milling (mβ-TCP-24h) exhibited excellent injectability even 1h after mixing. The mechanical properties of the set cement (compact) were evaluated using compressive strength (CS) and diametral tensile strength (DTS) testing. The CS and DTS values of the mβ-TCP-24h compacts were 8.02MPa and 2.62MPa, respectively, at 5h after mixing, and were 49.6MPa and 7.9MPa, respectively, at 2 weeks after mixing. All the CS and DTS values of the mβ-TCP-24h compacts were significantly higher than those of the control for the same duration after mixing. These results suggest that the mechano-chemically modified β-TCP powder dissolves rapidly and accelerates hydroxyapatite precipitation, which successfully shortens the cement setting time and enhances the strength. This study supports that mβ-TCP-24h is a promising candidate for use in injectable CPCs with improved strength.

Journal of the Mechanical Behavior of Biomedical Materials


徳島県下の地域歯科診療所における病院・施設への往診/訪問歯科診療の現状

徳島県下の地域歯科診療所における病院・施設への往診/訪問歯科診療の現状

Journal of Shikoku Public Health Society


Current Status and Problems Regarding the Perioperative Oral Function Management in the Tokushima University Hospital

徳島大学病院における周術期口腔機能管理の現状と課題

It has been shown that oral hygiene affects the onset of perioperative complications. The usefulness of perioperative oral function management aiming at the outbreak decrease in treatment complications and an early discharge was recognized. As a result, perioperative oral function management fee was founded at revision of medical service fees in Fiscal year 2012. In this clinical study, we evaluated the implementation of perioperative oral function management in Tokushima University Hospital. We examined 781 patients, including 563 patients for surgery and 218 patients for chemotherapy and radiotherapy. The mean age of patients was 58.8 ± 12.4 years old. The implementation rate of perioperative oral function management was 9.7% in the patients of surgery, and 17.4% in those of chemotherapy and radiotherapy. The highly required medical department was neurosurgery in the patients of surgery, and hematology in those of chemotherapy and radiotherapy. The mean number of tooth present was 21.3 ± 7.1 in the patients of surgery, and 19.8 ± 7.2 in those chemotherapy and radiotherapy. The rate of dental treatment was required in 40.5% of total patients who received surgery, and in 51.4% of patients who received chemotherapy and radiotherapy.The rate of patients who received denture treatment attained to 11.9% of the whole patients receiving surgery, and 13.3% of patients receiving chemotherapy and radiotherapy. It was revealed that there were many patients required potential demands in perioperative oral function management, and that there were many patients who need dental or denture treatment. We would like to develop perioperative oral function management by the interprofessional collaboration in health and social care.7月発行だが，6月号である．


Neuroendocrine tumor in the mandible: a case report with imaging and histopathologic findings

Neuroendocrine tumors (NETs) arise from neuroendocrine cells and are mostly observed in the gastrointestinal tract, pancreas, and lungs. NETs in the oral and maxillofacial region are extremely rare. We report a case of a 59-year-old woman with an NET in the mandible. The patient did not show any symptoms except for remarkable swelling and bleeding. The lesion appeared as a radiolucent honeycomb abnormality with bone destruction on panoramic radiography. The histopathologic diagnosis following a biopsy was NET. Contrast-enhanced computed tomography (CT), (18)F-fluorodeoxyglucose positron emission computed tomography ((18)F-FDG PET/CT), and adrenal scintigraphy-labeled meta-iodobenylguanidine were the modalities added to identify the primary site. Multiple lesions were confirmed in the gastrointestinal tract. Endoscopy was performed to identify the lesions, and several lesions were observed protruding from the mucous membranes. However, the endoscopy specimens did not yield an accurate diagnosis because adequate samples were not acquired. Blood and urine tests revealed no functional activity caused by the tumors. Although the origin was not histopathologically confirmed with endoscopy, this patient was situationally diagnosed with nonfunctional NET originating from the duodenum, as demonstrated by the metastases in the mandible.

Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology


徳島大学病院脳卒中センターにおける口腔管理の意義について

徳島大学病院脳卒中センターにおける口腔管理の意義について


Durability of Bond Strength Between Titanium and two PMMAs

Reserach & Reviews: A Journal of Dentistry


The usefulness of the educational management network system for promoting "dental education program with community-rearing"

地域育成型歯学教育を推進するための教育管理ネットワークシステム導入の有用性

日本歯科衛生教育学会雑誌


Current state of request for Oral Care in the Tokushima University Hospital

徳島大学病院内の口腔ケア依頼状況


Stress analysis in human temporomandibular joint affected by anterior disc displacement during prolonged clenching.

Parafunctional habits, such as prolonged clenching and bruxism, have been associated with dysfunctional overloading in the temporomandibular joint (TMJ). In this study, stress distributions in the TMJ were analysed during prolonged clenching, using three-dimensional finite element (FE) models of the TMJ with and without disc displacement. The aim of this study was to investigate stress distribution of the cartilaginous tissues in the TMJ with and without disc displacement. Finite element models were developed on the basis of magnetic resonance images from two subjects with and without anterior disc displacement. Condylar movements recorded during a 5-min clenching were used as the loading condition for stress analysis. In the asymptomatic model, the highest von Mises stresses were located in the lateral area (4·91 MPa) of the disc surfaces, and after 5-min clenching, the higher stresses were still located at the lateral area (3·65 MPa). In all the cartilaginous tissues, 30-50% of stress reduction occurred during 5-min clenching. In contrast, the von Mises stress in the cartilaginous tissues of the symptomatic model with disc displacement was markedly lower, compared with the asymptomatic model. However, in the condylar cartilage, stress relaxation during clenching was not recognised. Furthermore, relatively high stresses were observed in the retrodiscal tissues throughout clenching. The present results indicate that disc position could be involved in the stress distribution of the TMJ components during prolonged clenching.


病院における専門的口腔ケアへの認知度と期待ー急性期脳卒中患者家族のアンケート調査よりー


Evaluation of newly developed bone cement introducing Strontium consistencies for bone regenerative substitute

Transactions of the Japanese Society for Medical and Biological Engineering


地域高齢者との福祉体験学習の教育効果と地域貢献事業としての評価

地域高齢者との福祉体験学習の教育効果と地域貢献事業としての評価

The purose of this study is to evaluate the educational effect by the welfare-experience learning program with aged people in community，and to evaluate this program as the regional contribution. This program is to aim at having a consciousness of becoming the dental professional in the University of Tokushima，Faculty of Dentistry，and they were carried out with 16 institutions (a total of 28 times).This program makes students accompany the oral health guidance"long-life oral healthy classroom"，and they carried out the experience study as on auxiliary person of the variaus functional oral-training for elderly people.By the investigation of the student's report, there are students who recognized the achievement objectives which are roles of the way concerning regional contribution as dental professionals in community. On the other hand，the questionnaire to the participating persoonnel was conducted in order to evalaote this program as the regional contrtbution. As a result，this program is useful to elderly people and the understanding of institution personnel is also deepened this practice. As mentioned above，the result of having is suitable for the educational goal "to have a consciousness of becoming the dental professional". Furthermore，this program was considered that future continuation is also expected by deepening of an understanding to the personnel's functional oral-training program.本研究の目的は，地域高齢者との福祉体験学習における学生への教育効果と，地域貢献事業としての評価をすることである．徳島大学歯学部では，医療人を志すものとしての自覚を持つことを目的とした取り組みを県内16カ所の施設で合計28回実施した．これは，学生が口腔保健指導「お口の健康長寿教室」において，高齢者を対象とした口腔機能訓練の補助者として体験学習するものである．学習後のレポートから， 到達目標とした地域貢献の在り方や歯科専門職としての役割を認識する学生が多くを占めた．一方，地域貢献事業として評価するため，参加職員への調査を行った結果，利用者への役立ちに加え，多くの施設職員の理解も深まったとのアンケート結果が得られた．以上から，本取り組みは学生への教育目標「医療人としての自覚を持つ」に沿った成果が得られており，また，施設職員の口腔機能向上プ口グラムへの盤解の深まりから，今後の継続が期待される．

Journal of University Education Research


Three-dimensional finite element analysis of cartilaginous tissues in human temporomandibular joint during prolonged clenching.

OBJECTIVE: Bruxism, the parafunctional habit of nocturnal grinding of the teeth and clenching, is associated with the onset of joint degeneration. Especially prolonged clenching is suggested to cause functional overloading in the temporomandibular joint (TMJ). In this study, the distributions of stresses in the cartilaginous TMJ disc and articular cartilage, were analysed during prolonged clenching. The purpose of this study was to examine if joint degradation due to prolonged clenching can be attributed to changes in stress concentration in the cartilaginous tissues. DESIGN: Finite element model was developed on the basis of magnetic resonance images from a healthy volunteer. Condylar movements recorded during prolonged clenching were used as the loading condition for stress analysis. RESULTS: At the onset of clenching (time=0s), the highest von Mises stresses were located in the middle and posterior areas (6.18MPa) of the inferior disc surface facing the condylar cartilage. The largest magnitude of the minimum principal stress (-6.72MPa) was found in the condylar cartilage. The stress concentrations were relieved towards the superior disc surface facing the temporal cartilage. On the surfaces of the temporal cartilage, relatively lower stresses were found. After 5-min clenching, both stress values induced in the TMJ components were reduced to 50-80% of the stress values at the onset of clenching, although the concomitant strains increased slightly during this period. CONCLUSIONS: It is suggested that both the condylar and temporal cartilage layers along with the TMJ disc, play an important role in stress distribution and transmission during prolonged clenching due to tissue expansion. Furthermore, our study suggests that a development of stress concentrations in the TMJ during prolonged clenching and risk factors for the initiation of TMJ degeneration could not be confirmed.


教育GP「高齢社会を担う地域育成型歯学教育」(第1報) 高齢者交流学習による教育効果

歯学部1年生22名(口腔保健学科16名，歯学科6名)を対象に，平成20年度に実施した高齢者交流学習の教育効果について考察した．交流前には同施設長より生と死，老いについて特別講義を受け，4回目の交流後及び最終回の交流後にふり返り授業を実施した．交流学習の教育効果については毎回の学習記録と共に自己評価を10点満点で記載させた．養護老人ホームにおいて高齢者との1対1の交流からコミュニケーションを養う交流学習を実施した結果，交流後の学習記録に認められる心に深く感じた内容や自己評価点数の上昇，更に四つの到達目標に沿った表現の記載が参加学生から認められたことから，1年次に実施した取り組みは人間力の向上という一般目標に適した有効な教育カリキュラムであると思われた．


Effects of Carbonic AnhydraseInhibitor Acetazolamide(AZ)on Osteoclasts and Bone Structure

We examined the changes of osteoclasts and bone structure in vivo and in vitro under the condition of low activity of bone resorption induced by acetazolamide (AZ). AZ is a specific inhibitor of carbonic anhydrase II (CA II), which is the enzyme indispensable for substantial proton generation by osteoclasts. In vivo study, we investigated histologically and histomorphometrically the changes of trabecular bone and osteoclasts at the cartilage-bone junction of tibiae in rats injected subcutaneously with AZ for 21 days. The area of trabecular bone of AZ treated group increased compared with control group. Moreover, AZ treatment decreased about 20% the number of osteoclasts at the cartilage-bone junction. In vitro study, we examined the effects of AZ on osteoclasts using culture system of rat bone marrow. The number of osteoclasts on the bone slice was suppressed by AZ of a concentration from 10^<-5> to 10^<-4> M in a doze-dependent manner. The number of osteoclasts cultured with 10^<-4>M AZ for 24 hours and with or without parathyroid hormone (PTH) on the bone slice and on the glass showed a significant decrease compared with the control group. Some osteoclasts treated with AZ showed morphological changes of apoptosis-like cell death, including shrinking of cytoplasm and fragmentation of nuclei. These results show that high-doze of AZ decreases bone resorption not only by inhibiting CA II but also by decreasing the number of osteoclasts via induction of cell death. This suggests that CA II plays an important role not only in proton formation but also in osteoclast survival.


即時荷重インプラントに関する臨床的検討: 臨床術式と1年経過時の臨床成績

即時荷重インプラントに関する臨床的検討: 臨床術式と1年経過時の臨床成績

Journal of Japanese Society of Oral Implantology

日本口腔インプラント学会誌


Clinical Examination of Immediate Loading Implants --- Procedure and 1-year Clinical Results

即時荷重インプラントに関する臨床的検討 --- 臨床術式と1年経過時の臨床成績

日本口腔インプラント学会誌


Effect of Surface Topography on Ssseointegration Establishment of Dental Implant --- Comparison between Smooth and Rough Surfaces

インプラントの表面性状がオッセオインテグレーション獲得に及ぼす影響 --- 滑面と粗面(陽極酸化面)フィクスチャーの比較

日本口腔インプラント学会誌


徳島大学歯学部OSCEトライアルにおける標準模擬患者の育成への取り組み

徳島大学歯学部OSCEトライアルにおける標準模擬患者の育成への取り組み


Prosthetic Treatment for a Patient with Burn-induced Microstomia --- A case report

熱傷による小口症患者に対する補綴治療 --- A case report

Journal of the Japanese Academy of Maxillofacial Prosthetics


Shape recovery of shape memory alloy fiber embedded resin matrix smart composite after crack repair

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.


Postgraduate Clinical Training at the Department of Oral and Maxillofacial Radiology, University Dental Hospital, The University of Tokushima --- The Questionnaire Survey to the Junior Residents

本学歯学部附属病院歯科放射線科における卒後臨床研修 --- 研修医に対するアンケート調査

The Journal of Japanese Dental Education Association

日本歯科医学教育学会雑誌


Influence of Changes in Occlusal Vertical Dimension on Tongue Pressure to Palate during Swallowing

Purpose : The purpose of the present study was to examine the relationship of tongue pressure and changes in occlusal vertical dimension to swallowing.Materials and Methods : The volunteer subjects were four young male dentulous adults and eight elderly complete denture wearers. The tongue pressure to the palate was simultaneously recorded with electromyography (EMG) measurements of the suprahyoid muscles as the occlusal vertical dimension changed. The subjects were instructed to perform two actions : swallowing without any liquid or food (dry swallowing) and swallowing of 2 ml water (wet swallowing).Results : During dry swallowing, the maximum pressure decreased significantly as the vertical dimension increased in the young subjects. In the elderly, the maximum tongue pressure decreased monotonically as the vertical occlusion increased. The same results were clearly found for wet swallowing. Overall data suggested that the tongue pressure of the elderly group was lower and the duration of tongue pressure in wet swallowing was longer than that of the younger group.Conclusion : An increase of the vertical dimension decreased the tongue pressure to the palate, whereas a decrease of the vertical dimension affected the tongue pressure less. Tongue pressure is an important factor for the evaluation of tongue function, especially swallowing.


Complete denture with a removable palatal lift prosthesis --- A case report and clinical evaluation

The palatal lift prosthesis is used to alleviate rhinopharyngeal closure dysfunction. It is generally problematical to use in edentulous patients, because the palatal lift prosthesis requires secure retention of the denture base and is difficult for the patient to retain while eating. This article describes the fabrication of a complete denture with a removable palatal lift prosthesis and a clinical evaluation of the denture's stability. A sprue pin and tube were used as a connecting attachment between the removable palatal lift prosthesis and the denture base. The force required for lifting the soft palate and the denture's stability were measured in the clinical evaluation. The prosthesis required an average retentive force of 0.26 N for each 1 mm of soft palate lift. The force required to dislodge the denture was measured with and without the palatal lift prosthesis in place. The force required to dislodge the conventional complete dentures of five healthy individuals was also measured as a reference. The denture was 24.4% less stable when the palatal lift prosthesis was in place and was generally easier to dislodge than were conventional dentures. This denture with a removable palatal lift prosthesis is useful for patients with dysfunction of the soft palate involving hypernasal speech who have difficulty in retaining the prosthesis while eating.


Surface-layer modification of hydroxyapatite ceramic with acid and heat treatments

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.


Shock Absorbability and Hardness of Commercially Available Denture Teeth

Composite resin teeth are more widely used than porcelain or acrylic resin teeth in the fabrication of removable dentures because of their high fracture toughness and high abrasion resistance. The purpose of this study was to evaluate the shock absorbability of commercially available artificial posterior teeth by the free drop-ball test with an accelerometer and to evaluate the Vickers hardness at the surface. The tested artificial teeth included seven composite resin teeth, one acrylic resin tooth, and one porcelain tooth. Specimens were tested 50 hours after immersion in distilled water at 37 degrees C. The impact value and Vickers hardness were measured. A one-way analysis of variance was used to analyzed the data (P = .05). The composite resin teeth showed an intermediate impact value between that of the acrylic resin tooth and the porcelain tooth. Among the artificial teeth investigated, the porcelain tooth showed the highest impact value. A significant difference in the impact value was observed between the porcelain tooth and the composite resin and acrylic resin teeth. However, no significant difference was observed among the composite resin teeth tested. A significant correlation was found between the impact values and the Vickers hardness of the artificial teeth. The present findings suggest that composite resin teeth and acrylic resin teeth have a higher shock absorbability than porcelain teeth.

The International Journal of Prosthodontics


Influence of thermal cycling in water on flexural strength of laboratory-processed composite resin

Recently a new generation of laboratory-processed composite resins containing submicron glass fillers was introduced, with claims of high strength. The purpose of this study was to evaluate the effect of thermal cycling in water on the flexural strength and hardness of several laboratory composite systems. The flexural strength of the new laboratory processed composite resins (Artglass [AG], Targis [TR] and Estenia [ES]) was significantly higher than that of conventional resins (Dentacolor [DC] and Cesead II [CS]). Thermocycling caused a reduction of the flexural strength but not a reduction of the hardness for most of materials tested. It was concluded that thermocycling affected the properties of the laboratory-processed hybrid type composite resin, ES, AG and TR. However, the changes of these properties were smaller than those of microfine type composite resin DC. Thus, ES, AG and TR may maintain better properties during service compared with DC.


Reinforcement effect of short glass fibers with CaO P2O5 SiO2 Al2O3 glass on strength of glass-ionomer cement

A high strength glass-ionomer (not resin-modified) cement was developed using short fibers of CaO--P(2)O(5)--SiO(2)--Al(2)O(3) (CPSA) glass. The purpose of this study was to clarify the effect of the CPSA short fibers contained in the flexural strength of the glass-ionomer cement. The 40 mass% short fibers of CPSA glass were added to the powder of commercial glass-ionomer cement. Beam specimens of set cement (25 x 2 x 2 mm) were prepared for measuring the flexural strength (FS). The specimens of set commercial glass-ionomer cement (GI) were used for comparison with glass ionomer cement with CPSA (FRGI). Half of all specimens were thermocycled in water for 60s of dwell time at 4 and 60 degrees C for 2500, 5000, and 10,000 cycles. The other specimens were stored in water at 37 degrees C as a control. The measurements were statistically analyzed using ANOVA. The initial FS of FRGI was 18.1 and that of GI was 7.7 MPa. After thermocycling, the mean FS ranged from 19.3 to 26.3 MPa and 9.8 to 11.1 MPa for FRGI and GI, respectively. After storage in water, the mean FS of FRGI and GI ranged from 20.4 to 25.9 MPa and 9.4 to 10.1 MPa, respectively. These findings suggested that glass-ionomer cement reinforced with CPSA short fibers maintains a higher strength than the conventional cement after aging.


Statistical Observation of Anterior Artificial Teeth Selected for Complete Denture

全部床義歯に用いられた前歯人工歯の統計的観察


Material Design of Denture Base Resin Reinforced by Shape Memory Alloy Fiber

形状記憶合金繊維で強化した床用レジンの材料設計

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.

形状記憶合金繊維で強化した床用レジンの引張強さについて検討した. 繊維表面のプライマー処理により形状記憶合金繊維強化レジン基複合材料の繊維のプルアウトが減少し, 引張強さが増加した. この引張強さの増加は繊維-マトリックス界面強度の増加によると考えられた. 60℃以上での熱処理によって複合材料の引張強さは若干増加したため, この試料がスマート複合材料として機能していることがわかった. 熱処理温度による引張強さの差は認められなかったが, 高温で熱処理した場合, 複合材料の屈曲が認められたため, 熱処理温度は低くすべきだとわかった. 熱処理後の引張強さがあまり増加しなかった理由は, 繊維マルテンサイト変態開始温度が高いためと考えられた.

The Journal of the Japanese Society for Dental Materials and Devices


形状記憶合金繊維強化床用レジンの損傷修復

形状記憶合金繊維強化床用レジンの損傷修復


Shock Absorbability of High-Abrasion-Resistance-Posterior Resin Teeth

硬質レジン人工臼歯の衝撃緩衝能に関する研究

The Journal of the Japan Prosthodontic Society


Addition of the Photo-cured Composite Resin for Crown to Abrasion-resistant Plastic Posterior Denture Teeth --- Effect of Surface Treatment on Bond Strength

硬質レジン歯への光重合型硬質レジンの添加について --- 表面処理が接合強さに及ぼす影響


Flexural strength of rebased denture polymers

The properties of denture base and reline resins may be affected by daily changes between room temperature and mouth temperature. The purpose of the study was to evaluate the effect of thermocycling on the flexural strength of the relined denture base polymer with reline resin. Three denture base resins, three hard reline resins and their combinations were tested. Fourteen specimens, 65x10x2.5 mm, were fabricated for each material. Polymer combination specimens were made using 1.5 mm hard reline resin on 1.0 mm cured denture base resins. Half of the specimens were stored for 50+/-2 h in distilled water at 37 degrees C, while the other half were thermocycled for 20 000 cycles between 4 and 60 degrees C. Three point bending tests were conducted on a universal testing machine at a cross-head speed of 0.5 cm/s. The flexural strengths were measured and a statistical analysis was performed on the data using three-way ANOVA (P<0.05). The results showed that the flexural strength of relined denture base polymer was significantly higher than that of hard reline polymer. Thermocycling did not affect the flexural strength of the relined denture base polymers, whereas the denture base polymer and reline polymer alone showed a decrease in strength after thermocycling.


Observation of Tongue Pressure to Palate at Swallowing --- Comparison between Young Dentitions and Elderly Complete Denture Wearers

嚥下時の口蓋に対する舌接触圧の観察 --- 若年有歯顎者と高齢総義歯装着者の比較


Influence of Buccal Interocclusal Distance on the Pressure Distribution --- In Vitro Study

頬側咬頭間隙量が負担圧分布に及ぼす影響 --- シミュレーターによる検討


Bond Strength of Silicone Rubber Impression Materials to Self-curing Resin

シリコーンラバー印象材と常温重合レジンとの接着強さについて


Influence of lining design of three processed soft denture liners on cushioning effect


Influence of Anterior Palatal Form on Speech --- Part 2 Relationship to Tongue and Mandibular Movements

前方部口蓋形態が発音運動に及ぼす影響について --- 第2報 舌運動，下顎運動との関連


Influence of occlusal scheme on pressure distribution under complete denture

The International Journal of Prosthodontics


Efficacy of Electrolyzed Water as Denture Cleanser --- Influence on in vitro Biofilm of Candida albicans

義歯洗浄剤としての電解水の効果 --- in vitroのCandida albicansバイオフィルムへの影響


部分床義歯症例の統計的観察 --- -卒前臨床実習症例について-

部分床義歯症例の統計的観察 --- -卒前臨床実習症例について-


Viscoelastic Properties of Silicone Elastomer for Maxillofacial Prosthesis

顎顔面補綴用シリコーン·エラストーマの動的粘弾性特性

Journal of the Japanese Academy of Maxillofacial Prosthetics


Influence of Implant Connection on Mandibular Flexure in Jaw Movement --- Three-dimensional Finite Element Analysis

下顎運動時の下顎骨の変形に対するインプラント連結の影響 --- 三次元有限要素法による解析


Influence of the thermocycling in water on ion-exchanged porcelain


Estimation of residual stress in dental porcelain by Laser-Raman spectroscopy


A Basic Study on Pressure Distribution of Supporting Structures under Complete Denture --- Part 4. Influence of Occlusal Scheme on Pressure Distribution under a Denture

全部床義歯床下組織の負担圧分布に関する基礎的研究 --- 第4報 咬合様式の差が義歯床下組織の負担圧分布に及ぼす影響

The Journal of the Japan Prosthodontic Society


Shear Bond Strength of Abrasion-resistant Plastic Teeth to Self-curing Resin --- Comparison of Bonding Agents

義歯用硬質レジン歯と即時重合レジンとの結合強さについて --- 各種ボンディング材の比較


Bond Strength of Six Soft Denture Liners Processed Against Polymerized and Unpolymerized Poly(methyl Methacrylate)

The International Journal of Prosthodontics


Impact Absorption of Four Processed Soft Denture Liners as Influenced by Accelerated Aging


Effect of barium in porcelain on bonding strength of titanium-porcelain system


Influence of the buccolingual position of artificial posterior teeth on the pressure distribution on the supporting tissue under a complete denture

The buccolingual position of artificial teeth is one of the important factors affecting denture stability, chewing efficiency, and pressure distribution on the supporting tissue under a denture. This study compared the pressure values on the supporting tissue under a denture during chewing in denture wearers, each of whom tried three different setting positions of artificial posterior teeth. The pressure on supporting tissue was greater on the working side that on the non-working side during chewing. The difference in mean pressure was found among the buccolingual positions of artificial posterior teeth. When the posterior teeth were set on the crest, the total pressure was the smallest. This strongly suggests that the setting position of artificial teeth should be considered not only for denture stability but also for the avoidance of high pressure on the supporting structures.


Effect of ion-exchange on fracture toughness and physical strength of dental porcelains

焼付用陶材のイオン交換法による強化と破壊力学特性に関する研究


Shock-absorbing Behavior of Soft Denture Liner --- Part 2 Influence of Lining Design on Shock Absorbability

軟質裏装材の衝撃緩衝に関する研究 --- 第2報 裏装法の違いが衝撃緩衝能に与える影響


An In Vitro Study of the Influence of Occlusal Scheme on the Pressure Distribution of Complete Denture Supporting Tissue

The International Journal of Prosthodontics


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

粘弾性解析による軟質裏装材の有用性に関する研究 --- 第3報 軟質裏装材の粘性が床下組織の応力分布に及ぼす影響


Dynamic viscoelastic properties of processed soft denture liners --- Part II--Effect of aging


Effect of Crystallization on Color and Translucency of Castable Glass-Ceramics Containing Two Crystals

結晶化温度がアパタイト系キャスタブルセラミックスの色調および透過性に及ぼす影響


A Basic Study on Pressure Distribution of Supporting Structures under Complete Denture --- Part 3. Influence of Occlusal Surface of Artificial Posterior Teeth on Pressure Distribution

全部床義歯床下組織の負担圧分布に関する基礎的研究 --- 第3報 臼歯人工歯の咬合面形態の差が負担圧分布に及ぼす影響


Dynamic viscoelastic properties of processed soft denture liners --- Part I--Initial properties


Thermal Diffusivity of Dental Ceramics at Room and Elevated Temperatures

歯科用セラミックスの熱拡散率の温度依存性について

The Journal of the Japanese Society for Dental Materials and Devices


Influence of crystallization on strength and color of castable glass-ceramics containing two crystals


Studies on Soft Denture Liner by using Viscoelastic Analysis --- Part 2. Effect of Lining Method of Denture Liner on Stress Distribution in Supporting Structures

粘弾性解析による軟質裏装材の有用性に関する研究 --- 第2報 軟質裏装材の裏装法の違いが床下組織の応力分布に与える影響

The Journal of the Japan Prosthodontic Society


Effect of leucite crystals on the strength of glassy porcelain


Shock-absorbing behavior of four processed soft denture liners


Sorption and solubility of 12 soft denture liners


A Basic Study on Pressure Distribution of Supporting Structures under Complete Denture --- Part 2. The Influence of the Inclination of Incisal Guide Plate of Semi-adjustable Articulator on Pressure Distribution

全部床義歯床下組織の負担圧分布に関する基礎的研究 --- 第2報 咬合器の切歯路指導板の傾斜が負担圧分布に及ぼす影響


Effect of crystallization on fracture strength of castable glass-ceramics containing two crystals


Properties of Castable Glass-ceramics Containing Cystalline Apatite and Magnesium Titanate

アパタイトとチタン酸マグネシウムを含有するキャスタブルセラミックスの諸性質


Effect of the Bonding Agent on Bond Strength of Silicone Elastomer to Denture Base Resin

シリコーンエラストマーと義歯床用レジンとの接着強さに関する研究

Journal of the Japanese Academy of Maxillofacial Prosthetics


Shock-absorbing Behavior of Soft Denture Liner --- Part 1 Plate Specimens

軟質裏装材の衝撃緩衝に関する研究 --- 第1報 板状試料の衝撃緩衝能


Effect of soft denture liner on stress distribution in supporting structures under a denture

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.

The International Journal of Prosthodontics


Difference Between theory and practice of tooth Arrangement for Denture

義歯人工歯配列の理論と実際との違い


Studies on Soft Denture Liner by using Viscoelastic Analysis --- Part 1 Effect of Soft Denture Liner on Stress Distribution in Supporting Structures

粘弾性解析による軟質裏装材の有用性に関する研究 --- 第1報 軟質裏装材が床下組織の応力分布に及ぼす影響


Viscoelastic Analysis of the Supporting Structures under Denture --- Part 1 Effect of the Artificial Teeth Arrangment on the Stress Distributions in the Supporting Structures

粘弾性解析による義歯床下組織の応力分布 --- 第1報 人工歯の配列位置が義歯床下組織の応力分布に及ぼす影響


Comparison of bond strength of six soft denture liners to denture base resin


Computer Simulation on Creep of Amalgam in Class I Cavity --- Occlusal Force was Loaded on Amalgam Filling

窩洞内でのアマルガムのクリープに関する有限要素法解析 --- 咬合接触がアマルガムにある場合

The Journal of the Japanese Society for Dental Materials and Devices


Computer simulation on creep of amalgam in class I cavity


Computer Simulation on Creep of Amalgam in Class I Cavity --- Occlusal Force was Loaded on Enamel

窩洞内でのアマルガムのクリープに関する有限要素法解析 --- 咬合接触が残存歯質にある場合


The influence of soft lining materials on pressure distribution


A Guideline for Incisal Table Adjustment of Semi-adjustable Articulator LL-85R --- Part 2. The Adjustment of Incisal Table

LL-85R 咬合器の切歯路指導板の調節についての1基準 --- 第2報 切歯路指導板の調節法について

The Journal of the Japan Prosthodontic Society


A Guideline for Incisal Table Adjustment of Semi-adjustable Articulator LL-85R --- Part 1. The influence of the inclination of guide plane on mevement path of upper first molar

LL-85R 咬合器の切歯路指導板の調節についての1基準 --- 第1報 咬合器指導板の傾斜が運動路に及ぼす影響について


Reinforcing Effect of a Ni-Cr Alloy Plate on an Acrylic Resin Denture Base


Clinical Evaluation of Chemical Denture Cleaning --- Change of the Color at the Palatal Mucosa under the Denture

義歯洗浄効果の臨床的観察 --- 義歯床下粘膜の色調変化


Stress Distribution of Supporting Tissues Under Denture --- Application of Viisco-elastic Analysis in Prosthetic Field

粘弾性解析による義歯床下組織の応力分布 --- 粘弾性解析の導入


Effect of viscoelastic deformation of soft tissue on stresses in the structures under complete denture


A Basic Study on Pressure Distribution of Supporting Structures under Complete Denture --- Part 1. Application of Pressure Dispersion Analyzing System by using Impedance

全部床義歯床下組織の負担圧分布に関する基礎的研究 --- 第1報 微少静電容量型負担圧測定システムの開発


Reinforcement of Acrylic Resin Denture Base With a Ni-Cr Alloy Plate

The International Journal of Prosthodontics


A Study on Cushoning Effects of Soft Lining Materials --- Part 1. An Experimental Study by using Pallarel Plate

軟性裏装材の緩圧効果効果に関する研究 --- 第1報 平行板実験


A Study on Pressures of Supporting Tissues Under Complete Denture During Functions --- Concerning the Effects of the Arrangement of Artificial Posterior Teeth

機能時における下顎全部床義歯の負担圧に関する研究 --- 特に人工歯配列位置との関係について


Studies on the Mobility of Complete dentures --- Part 1. Investigation of a Method of Measurement and Analysis using MKG

全部床義歯の動揺について --- 第1報 MKGを用いた測定分析方法の検討


Studies on Reproduction of Condylar Path by means of Articulators --- Part 1. Semi-Adiustable Articulators

咬合器の顆路再現性に関する研究 --- 第1報 半調節性咬合器


Identification of Prematured Contact Tooth with Occlusal Sound --- Part 3. Application of the principle of Pattern Recognition

咬合音による早期接触歯の同定 --- 第3報 パターン認識手法の応用


Studies on Mechanism of Speech --- Part1. Normal Subjects

発音のメカニズムに関する研究 --- 第1報 正常有歯顎者


Problems on the Time character of the Mandibular Kinesiograph

MKGを用いた下顎運動の計時的測定に際して注意すべき2，3の問題点について


Effects of poloxamer additives on strength, injectability, and shape stability of beta-tricalcium phospEffects of poloxamer additives on strength, injectability, and shape stability of beta-tricalcium phosphate cement modified using ball-millinghate cement modified using ball-milling

A new CPC was developed in this study using a β-TCP powder mechano-chemically modified by ball-milling. The prototype CPC exhibits excellent fluidity for easy injection into bone defects; however, there is a risk of leakage from the defects immediately after implantation due to its high fluidity. The addition of poloxamer, an inverse thermoresponsive gelling agent, into CPC optimizes the fluidity. At lower temperatures, it forms a sol and maintains good injectability, whereas at the human body temperature, it transforms to a gel, reducing the fluidity and risk of leakage. In this study, the effects of poloxamer addition of 3, 5, and 10 mass% on the injectability, shape stability, and strength of the prototype CPC were evaluated. The calculated injectability of the prototype CPC pastes containing three different poloxamer contents was higher than that of the CPC paste without poloxamer for 15 min at 37 °C. Furthermore, the shape stability immediately after injection of the three CPC pastes with poloxamer was higher than that of the CPC paste without poloxamer. After 1 week of storage at 37 °C, the compressive strength and diametral tensile strength of the CPC compacts containing 10 mass% poloxamer were similar to those of the CPC compact without poloxamer. Additionally, the CPC compacts containing 10 mass% poloxamer exhibited clear plastic deformation after fracture. These results indicate that the addition of poloxamer to the prototype CPC could reduce the risk of leakage from bone defects and improve the fracture toughness with maintaining the injectability and strength.

Journal of the Mechanical Behavior of Biomedical Materials


Challenges and Improvements in a Workshop-Type Class in BYOD

BYOD環境によるワークショップ型実習の課題と改善

Journal of University Education Research


A case of preparing complete denture using duplicate denture

複製義歯を用いて上顎総義歯の新製を行った症例


新しい方式を用いた非接触式3次元形状計測機の開発

新しい方式を用いた非接触式3次元形状計測機の開発


Sleep bruxism and masseter muscle activity during rem sleep of rem sleep behavior disorder patients: a case control study


Clinical Application of Laser in Dentistry

歯科用レーザーの臨床応用について


キャリア形成支援教育プログラムの開発と教育効果の評価-「チーム医療体験学習」の実践的研究を通して-

We prepared career advancement program "Experience learning in medical team treatment" towards the second，third and fouth year students of dental school. This program consits of prior learningconcerned with 'Team treatment and Dental profession' and experience learning in medical team treatment at Tokushima University Hospital.The purpose of this program was to rouse career conciousness as a dentalprofession. This program provided students with career image which they want to be in the future. Besides，they were motivated to study more widely to approach their own image. In this paper，we evaluated theeffects of the program"The experience learning in medical team treatment" on career advancement ofdental school students. As a result，it is suggested that this program might be fruitful as career advancement on dental students.我々は歯学部学生のキャリア形成支援のための教育プログラム「チーム医療体験学習」を開発し，歯学部の2，3，4年次の学生を対象として実施した．本プログラムは，グループワークによる事前学習とチーム医療の現場体験を2つの柱とし，学生の歯科医療職としてのキャリア意識を強化することを目的とした．プログラム終了時のアンケートから，学生には歯科専門職としての将来の姿勢や目指す方向性が具体化すると同時に幅広い知識を身につけたいといった学習に対する動機付が強化されるなど明らかな教育成果が認められた．プログラム実施前後のアンケートの分析結果から， 「チーム医療体験学習」が歯学部学生のキャリア形成支援教育の手法として有効なプログラムである可能性が示唆された．


Effects of fiber-resin interface property on shape recovery and mechanical properties of denture-base-resin matrix smart composite


Shape recovery of Ni-Ti alloy fiber-reinforced denture base resin by smart repair process


Effect of barium in porcelain on bonding strength of titanium-porcelain system.

The bonding strength to titanium, thermal expansion, and bending strength of glassy porcelain containing barium of 5, 10, and 15 mass% were estimated and compared with those of barium-free porcelain, to estimate the effect of barium content on bonding strength to titanium. The three different glassy porcelains containing barium were made by melting at 950 degrees C. The bonding strength of a commercial porcelain to titanium increased with the addition of barium. Bending strength and thermal expansion were not affected by the barium content. Therefore, the addition of barium to porcelain is effective for strengthening the bonding of porcelain to titanium.