Yuki Iwawaki, Takaharu Goto, Takahiro Kishimoto, Takashi Matsuda, Keiko Fujimoto, Kan Nagao, Kenji Yoshimura, Teppei Tajikara, Yoshiyuki Eshita, Yoshitaka Yano and Tetsuo Ichikawa : Efficacy evaluation with stratified randomized controlled study of foam dentifrice containing isodecyl galactosides in older adults, Journal of Oral Science, 67, 3, 134-139, 2025.
(要約)
Oral hygiene is mainly maintained by mechanical plaque removal, but this is often inadequate in older adults. Isodecyl galactosides (ID-Gal) inhibits bacterial co-aggregation and could promote the maintenance and improvement of oral hygiene. In this study, the efficacy of ID-Gal-containing foam dentifrice in oral hygiene among older adults was evaluated. Fifty-six subjects aged 65 years or older visited Tokushima University Hospital and were randomly assigned to interventions using ID-Gal-containing foam dentifrice applied to the dorsum of the tongue, or to controls using their usual dentifrice. Microbiological and clinical oral health parameters were evaluated before, and at 1 and 2 months after the intervention. The intervention group showed significant decreases in black pigment-producing bacteria on the dorsum of the tongue, Fusobacterium, and total bacterial counts on the mucosa below the denture base after 1 month. Additionally, the intervention group showed significant decrease in the Winkle Tongue Coating Index (WTCI) after 2 months. ID-Gal-containing foam dentifrice decreased the number of bacteria by suppressing plaque formation and contributed to a reduction in the number of bacteria on the tongue and the WTCI. Collectively, these results suggest that ID-Gal-containing foam dentifrice is effective in maintaining and improving oral hygiene.
(キーワード)
Humans / Dentifrices / Female / Male / Aged / Oral Hygiene / Dental Plaque / Treatment Outcome / Aged, 80 and over / Tongue
Tetsuo Ichikawa, Tomoya Koda, Mio Kitamura, Takahiro Kishimoto, Takashi Matsuda, Takaharu Goto, Masayuki Domichi, Akiko Suganuma, Shinji Fujiwara, Yasuhiko Shirayama, Kazuhiko Kotani and Naoki Sakane : Subjective assessment of sensory function and oral function decline in older adults, PLoS ONE, 20, 6, e0326788, 2025.
(要約)
Sensory decline in older adults significantly affects quality of life and contributes to cognitive decline, depression, falls, and injuries. Although several studies exist in this area, most were focused on individual senses, with few being conducted on comprehensive assessments of all five senses. The aim of this study was to investigate the relationship between subjective sensory assessment and oral function, to developing health strategies. This study was conducted as part of the Mima-SONGS Study for examining relationships between oral, cognitive, and physical functions, social factors, nutrition, and health, in older adults living in a mountainous region of Japan. The cohort included 62 participants (40 women and 22 men; mean age: 80.8 yrs.) as of December 2023. Participants completed a questionnaire assessing sensory perception and eating enjoyment rated on a four-point scale. Oral health was evaluated based on the conditions of remaining teeth, tongue coating, oral dryness, occlusal force, oral diadochokinesis, and repetitive salivary swallow test. Sensory assessments indicated minimal overall issues, with auditory problems scoring the highest and taste/tactile issues scoring the lowest. Males scored higher in hearing and maximum occlusal force. Eating enjoyment was generally high and negatively correlated with olfactory and taste problems. Subjective sensory issues were less strongly associated with oral function and age. Most older adults were not subjectively aware of sensory problems, especially olfaction, taste, and tactile problems. Subjective sensory problems showed a moderate but meaningful association with oral health conditions and age. The findings might be valuable data developing future support measures.
(キーワード)
Humans / Male / Female / Aged, 80 and over / Aged / Oral Health / Surveys and Questionnaires / Quality of Life / Japan / Sensation / Taste
Takaharu Goto, Shinji Fujiwara, Tomoya koda, Takashi Matsuda, Mio Kitamura, Yasuhiko Shirayama and Tetsuo Ichikawa : Biopsychosocial consideration of Ikigai in older adults in Japan through a cross-sectional study., Geriatrics, 9, 3, 78, 2024.
(要約)
-a Japanese concept that includes elements such as life's purpose and meaning-has been reported to be associated with various systemic health conditions, such as the risk of developing physical dysfunction or death in older adults. However, there are no reports that comprehensively examine the psychological and social aspects of . We attempted to clarify the characteristics of by examining it from a biopsychosocial model using physical, psychological, and social perspectives through a cross-sectional study on sarcopenia, frailty and healthy life expectancy in a hilly and mountainous area of Japan. Koyadaira in Mima City, which is located in a hilly and mountainous region on Shikoku Island in Japan, was targeted. This cross-sectional study included 105 outpatients aged 65 and over, with an average age of 79.02 ± 6.91 years. (self-rating score on a scale of 0 (no ) to 5 (the highest )) participants' level of physical activity (the Physical Activity Scale for the Elderly, PASE), degree of depression (the Geriatric Depression-15 Scale, GDS-15), cognitive function (the Mini-Mental State Examination, MMSE) and social isolation (the abbreviated Lubben Social Network Scale, LSNS-6) was assessed. Significant positive correlations were found between PASE and MMSE. The LSNS-6 significantly correlated with the MMSE and GDS-15. In a path model, out of four paths from PASE, GDS-15, MMSE, and LSNS-6 to , the path from the GDS-15 alone was significant (correlation coefficient -0.271, < 0.01). The adaptability of this model was good. This study indicates that depressive status has a large impact on , along with physical, cognitive, and social conditions; thus, it is appropriate to consider that an affective psychological status, such as depressive symptoms, is a fundamental condition for having .
Adityakrisna Putra Yoshi Wigianto, Yuichi Ishida, Takashi Matsuda, Takaharu Goto, Megumi Watanabe and Tetsuo Ichikawa : Novel Magnetic Attachment System Manufactured Using High-Frequency Heat Treatment and Stamp Technique: Introduction and Basic Performance, Dentistry Journal, 10, 5, 75, 2022.
(要約)
Recently, a novel magnetic attachment with extremely low cost and high performance was developed. This article aims to introduce a novel magnetic attachment and to evaluate its basic eligibility for denture retention in clinical practice. The novel magnetic attachment system used in this study was the direct-bonding root-keeper-type Magteeth™ MT800 (MagneDesign, Nagoya, Japan). The retentive force without displacement (position 0) and after horizontal displacement to positions 0.5, 1, 1.5, 2, 2.5, and 3 mm were measured. The values relative to the retentive force without displacement were gradually decreased to 82.7 ± 16.3%, 68.8 ± 17.1%, 62.4 ± 15%, 47.2 ± 13.1%, 35.7 ± 9.9%, and 20.7 ± 6.5%, respectively. The retentive force and magnetic field strength did not change significantly after the load test (100 N load, 10,000 times). No new gap between the metal and resin was found in the root keeper- and magnet assembly-embedded blocks after the load test. Some scratches on magnetic assembly and root keeper surface, while no change in the resin texture after the load test were observed. Based on the findings of this preliminary study, this novel low-cost magnetic attachment exhibited favorable retention, strength, and durability for clinical use.
Kosuke Kurahashi, Takashi Matsuda, Yuichi Ishida and Tetsuo Ichikawa : Effect of polishing protocols on the surface roughness of polyetheretherketone., Journal of Oral Science, 62, 1, 40-42, 2020.
(要約)
The purpose of this study was to evaluate the influence of various polishing protocols on the surface roughness of polyetheretherketone (PEEK) and identify an effective polishing method of dental prostheses at the chairside. The PEEK specimens were assigned to seven groups with different protocols: no additional polishing (NT); polishing using a rubber point (C); polishing using "silky shine" (S); polishing using "aqua blue paste" (A); protocol C followed by protocol S (CS); protocol C followed by protocol A (CA); and protocol C followed by protocols S and A (CSA). The surface roughness (Sa and Ra) of the polished surfaces was measured. The surface roughness decreased in the following order of groups: NT, C, S, CS, CSA, CA, and A. In Groups C and S, wide deep pits formed by abrasive grains of SiC paper were observed, whereas only fine linear structures were observed on the surface in other groups. With respect to the polishing protocol of PEEK, clinically acceptable surface roughness was obtained using a soft polishing brush and agent for more than 3 min.
Yuki Iwawaki, Takashi Matsuda, Kosuke Kurahashi, Tsuyoshi Honda, Takaharu Goto and Tetsuo Ichikawa : Effect of the temperature of water on ultrasonic denture cleaning, Journal of Oral Science, 61, 1, 140-145, 2019.
(要約)
Denture plaque is a biofilm composed of various microorganisms aggregated with saliva. Various denture cleansers and cleaning apparatuses have been developed and studied. However, the optimum water temperature for denture cleaning is unknown. Therefore, the present study investigated the effects of water temperature during ultrasonic denture cleaning. In vitro, resin disks with artificial Candida albicans biofilm were pressed onto Candida GE media after ultrasonic cleaning with water at different temperatures for 5 min. The media were subsequently cultured at 37°C for 24 h. The colonies formed were observed and colony areas were quantified using ImageJ software (US National Institutes of Health, Bethesda, MD, USA). In situ, the bacterial count and degree of cleanliness on the tissue surface of maxillary dentures were measured before and after ultrasonic cleaning with water at different temperatures for 5 min. Changes in bacterial counts and cleanliness were calculated for each temperature. The ratio of the area occupied by bacterial colonies in vitro and reduction rates in situ after cleaning with warm water were markedly less than those observed after cleaning with cold water. Therefore, ultrasonic denture cleaning with warm water is more effective.
(キーワード)
Bacteria / Biofilms / Candida albicans / Colony Count, Microbial / Culture Media / Dentures / Disinfection / Hot Temperature / Ultrasonic Waves / Water
Tetsuo Ichikawa, Kosuke Kurahashi, Lipei Liu, Takashi Matsuda and Yuichi Ishida : Use of a Polyetheretherketone Clasp Retainer for Removable Partial Denture: A Case Report, Dentistry Journal, 7, 1, 4, 2019.
(要約)
Clasp retainers made of metal alloys may be esthetically unappealing or cause allergic reactions. To investigate alternative materials, we used the nonfiller polyetheretherketone (PEEK) to fabricate the clasp retainer of a removable partial denture for the mandibular bilateral distal free-end abutment of an 84-year-old female. Two years later, few color and texture changes of PEEK were found macroscopically. The rest part and the clasp arm fitted well without any deformation. There were no particular occlusal or periodontal problems. Subjective satisfaction was expressed by both the practitioner and the patient.
Kosuke Kurahashi, Takashi Matsuda, Takaharu Goto, Yuichi Ishida, Teruaki Ito and Tetsuo Ichikawa : Duplication of complete dentures using general-purpose handheld optical scanner and 3-dimensional printer: Introduction and clinical considerations, Journal of Prosthodontic Research, 61, 1, 81-86, 2017.
(要約)
To introduce a new clinical procedure for fabricating duplicates of complete dentures by bite pressure impression using digital technology, and to discuss its clinical significance. The denture is placed on a rotary table and the 3-dimensional form of the denture is digitized using a general-purpose handheld optical scanner. The duplicate denture is made of polylactic acid by a 3-dimensional printer using the 3-dimensional data. This procedure has the advantages of wasting less material, employing less human power, decreasing treatment time at the chair side, lowering the rates of contamination, and being readily fabricated at the time of the treatment visit.
Takashi Matsuda, Takaharu Goto, Kazutomo Yagi, Toshiya Kashiwabara and Tetsuo Ichikawa : Part-digitizing system of impression and interocclusal record for complete denture fabrication, Journal of Prosthodontics, 25, 6, 503-509, 2016.
(要約)
Few studies have reported the application of digital technology to removable dentures, particularly for the process of impression and interocclusal recording for complete denture fabrication. This article describes a part-digitizing system of impression and interocclusal records for complete denture fabrication. The denture foundation area in an edentulous mouth, including the border areas and residual ridge, is outlined by tracing the surfaces with a 3-D pen-type digitizer. Specialized trays for final impressions and interocclusal records were generated using computer-aided design and manufactured using the digital data. Final impression and interocclusal records were carried out using these specialized trays. The computer-aided method using preliminary digital impressions and specialized trays would be feasible for clinical use for complete denture fabrication.
Takashi Matsuda, Takaharu Goto, Kosuke Kurahashi, Toshiya Kashiwabara, Megumi Watanabe, Yoritoki Tomotake, Kan Nagao and Tetsuo Ichikawa : Digital assessment of preliminary impression accuracy for edentulous jaws: Comparisons of 3-dimensional surfaces between study and working casts, Journal of Prosthodontic Research, 60, 3, 206-212, 2016.
(要約)
The aim of this study was to compare 3-dimensional surfaces of study and working casts for edentulous jaws and to evaluate the accuracy of preliminary impressions with a view to the future application of digital dentistry for edentulous jaws. Forty edentulous volunteers were serially recruited. Nine dentists took preliminary and final impressions in a routine clinical work-up. The study and working casts were digitized using a dental 3-dimensional scanner. The two surface images were superimposed through a least-square algorithm using imaging software and compared qualitatively. Furthermore, the surface of each jaw was divided into 6 sections, and the difference between the 2 images was quantitatively evaluated. Overall inspection showed that the difference around residual ridges was small and that around borders were large. The mean differences in the upper and lower jaws were 0.26mm and 0.45mm, respectively. The maximum values of the differences showed that the upward change mainly occurred in the anterior residual ridge, and the downward change mainly in the posterior border seal, and the labial and buccal vestibules, whereas every border of final impression was shortened in the lower jaw. The accuracy in all areas except the border, which forms the foundation, was estimated to be less than 0.25mm. Using digital technology, we here showed the overall and sectional accuracy of the preliminary impression for edentulous jaws. In our clinic, preliminary impressions have been made using an alginate material while ensuring that the requisite impression area was covered.
Takashi Matsuda, Takaharu Goto, Kosuke Kurahashi, Toshiya Kashiwabara and Tetsuo Ichikawa : Development of a digital impression procedure using photogrammetry for complete denture fabrication, International Journal of Computerized Dentistry, 19, 3, 193-202, 2016.
(要約)
We developed an innovative procedure for digitizing maxillary edentulous residual ridges with a photogrammetric system capable of estimating three-dimensional (3D) digital forms from multiple two-dimensional (2D) digital images. The aim of this study was to validate the effectiveness of the photogrammetric system. Impressions of the maxillary residual ridges of five edentulous patients were taken with four kinds of procedures: three conventional impression procedures and the photogrammetric system. Plaster models were fabricated from conventional impressions and digitized with a 3D scanner. Two 3D forms out of four forms were superimposed with 3D inspection software, and differences were evaluated using a least squares best fit algorithm. The in vitro experiment suggested that better imaging conditions were in the horizontal range of ± 15 degrees and at a vertical angle of 45 degrees. The mean difference between the photogrammetric image (Form A) and the image taken from conventional preliminarily impression (Form C) was 0.52 ± 0.22 mm. The mean difference between the image taken of final impression through a special tray (Form B) and Form C was 0.26 ± 0.06 mm. The mean difference between the image taken from conventional final impression (Form D) and Form C was 0.25 ± 0.07 mm. The difference between Forms A and C was significantly larger than the differences between Forms B and C and between Forms D and C. The results of this study suggest that obtaining digital impressions of edentulous residual ridges using a photogrammetric system is feasible and available for clinical use.
松田 岳, 後藤 崇晴, 柏原 稔也, 市川 哲雄 : 無歯顎補綴における咬合平面設定に関する文献考察, Journal of Oral Health and Biosciences, 28, 1, 13-19, 2015年.
(要約)
The maxillomandibular registration is one of important processes to achieve patientsatisfaction with the function and esthetics for complete denture fabrication. Over the years, clinical decision of vertical and horizontal jaw relationship has been mainly discussed in the maxillomandibular registration. With regard to the occlusal plane setting, many clinicians have believed to decide the occlusal plane parallel to Camper's plane, however there is little information on the effect of occlusal plane setting on clinical meanings and outcome. The aim of this study is to analyze published literature focusing on the occlusal plane and the related oral function and esthetics, and to clarify clinical implications of occlusal plane setting. Two databases, "PubMed" and "Japana Centra Revuo Medicina" were searched to retrieve research papers focusing on the occlusal plane.Seventy four papers were selected from the database, and they were reviewed.Literature reviews suggests that many landmarks were described on the occlusal plane setting for edentulous patients; and Camper's plane has been most frequently referred, showed a good result in function, but not always good in esthetics. The influence of occlusal plane setting on clinical results: oral function, esthetics, denture stability, and patient satisfaction after denture delivery has to be examined.
Takahiro Kishimoto, Takaharu Goto, Takashi Matsuda, Yuki Iwawaki and Tetsuo Ichikawa : Application of artificial intelligence in the dental field: A literature review., Journal of Prosthodontic Research, 66, 1, 19-28, Jan. 2022.
(要約)
Application of AI in the dental field has progressed; however, the criteria for evaluating the efficacy of AI have not been clarified. It is necessary to obtain better quality data for machine learning to achieve the effective diagnosis of lesions and suitable treatment planning.
Takashi Matsuda : Complete denture fabrication using duplicate denture assisted by digital technology, Symposium digital & magnet dentistry, Oct. 2023.
2.
Takashi Matsuda : Efficiency of complete denture fabrication using digital technology; Part-digitizing system for complete denture fabrication., The 4th ASEAN plus and TOKUSHIMA Joint International Conference on Challenging and Innovation in Oral Sciences, Dec. 2017.
3.
Takaharu Goto, Hihara Tsukasa, Kishimoto Takahiro, Takashi Matsuda, Yuki Iwawaki, Kan Nagao and Tetsuo Ichikawa : Investigation with questionnaires on symptoms of oral frailty and eating behaviors: Importance of chewing, Biennial Joint Congress of JPS-CPS-KAP, Wenzhou, China, Oct. 2017.
4.
Tetsuo Ichikawa, Higaki Nobuaki, Takaharu Goto, Kishimoto Takahiro, Yuki Iwawaki, Takashi Matsuda, Ishida Yuichi and Watanabe Megumi : A comparison of the occlusal force-sustaining ability of natural and dental implant patients during a sensory integration task, Biennial Joint Congress of JPS-CPS-KAP, Wenzhou, China, Oct. 2017.
5.
Takashi Matsuda, Kurahashi Kosuke, Ishida Yuichi, Takaharu Goto, Kan Nagao and Tetsuo Ichikawa : Part-digitizing system for complete denture fabrication using digital impression and specialized CAD/CAM tray, The 17th Biennial Meeting of International College of Prosthodontists, Santiago, Chile, Sep. 2017.
6.
Takaharu Goto, Hihara Tsukasa, Kishimoto Takahiro, Takashi Matsuda and Tetsuo Ichikawa : Influence of solitary eating in the elderly on symptoms on Oral frailty and Physical frailty, The 17th Biennial Meeting of International College of Prosthodontists, Santiago, Chile, Sep. 2017.
7.
Takashi Matsuda, Takaharu Goto, Toshiya Kashiwabara, Kan Nagao and Tetsuo Ichikawa : Possibility of Complete Denture Fabrication using Digital Technology: the possibility of Contactless Digital Preliminary Impression, The 3rd ASEAN plus and TOKUSHIMA Joint International Conference on ``Strategic Achievement of Oral Sciences and Promotion of Quality of Life'', Makassar, Dec. 2014.
8.
Takashi Matsuda, Tetsuo Ichikawa, Takaharu Goto, Toshiya Kashiwabara and Kan Nagao : Digital preliminary impression for complete denture fabrication, Indonesia Japan Prosthodontic Society JOINT MEETING, Bali, Oct. 2014.
9.
Takashi Matsuda, Takaharu Goto, Yuichi Ishida, Toshiya Kashiwabara, Kan Nagao and Tetsuo Ichikawa : A Trial of Complete Denture Fabrication using Digital Technology: in vitro Evaluation of digital impression, ASEAN plus and TOKUSHIMA Joint International Conference"Strategic Achievement of Oral Sciences and Promotion of Quality of Life", Yogyakarta, Dec. 2012.
10.
Takaharu Goto, Takashi Matsuda, Yuichi Ishida, Toshiya Kashiwabara, Kan Nagao and Tetsuo Ichikawa : Digital dentistry in complete denture fabrication, --- Feasibility study ---, International Symposium on Oral Health Education and Research, Balikpapan, Dec. 2011.