Objective Analysis on Factors Affecting Difficulty of Denture Treatment

• Project/Area Number: 26462936
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Prosthodontics/ Dental materials science and
• Research Institution: Showa University
• Principal Investigator: Shimodaira Osamu 昭和大学, 歯学部, 講師 (30235684)
• Co-Investigator(Kenkyū-buntansha): 佐藤 裕二 昭和大学, 歯学部, 教授 (70187251) ; 北川 昇 昭和大学, 歯学部, 准教授 (80177831) ; 七田 俊晴 昭和大学, 歯学部, 講師 (70307057) ; 磯部 明夫 昭和大学, 歯学部, 助教 (30635082) ; 青柳 佳奈 昭和大学, 歯学部, 兼任講師 (10709760)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
• Keywords: 三次元有限要素解析法 / 義歯支持粘膜 / 弾性率 / 粘膜厚さ / 疼痛閾値 / 圧力 / 圧縮率 / 沈下量 / 三次元有限要素モデル / 荷重量 / 厚さ / ひずみゲージ / バイオメカニクス特性 / 高齢無歯顎者 / 若年有歯顎者

Outline of Final Research Achievements

Purpose: In this study, we examined a three-dimensional finite element analysis (FEA) method of measuring optimum elasticity using thickness and load data collected from elderly edentulous patients when they felt pressure-related pain.
Results: Compared with measured elasticity, optimum elasticity was significantly less (P < .05), and correlations were found in all three palatal parts where experiments were carried out (P < .01). A correlation between thickness and measured elasticity was found at the midpoint part (P < .05), but not at the median or lateral part. A correlation between thickness and optimum elasticity was not found in all three areas of the palate where experiments were carried out. Our study has proven that it is difficult to estimate elasticity using the thickness of denture-supporting tissue, demonstrated that it is necessary to optimize elasticity at all palatal parts in the FEA, and established a method to measure elasticity.

Research Products

• [Journal Article] Relationship between Palatal Mucosa Properties and Pressure-pain Threshold in Young Dentulous and Elderly Edentulous Subjects (2015)
  • Author(s): Kotani, Y., Sato, Y., Kitagawa, N., Shimodaira, O., Takeuchi, S., Isobe, A., Takamatsu, N., Tanaka, S. and Hara, S.
  • Journal Title: Ronen Shika Igaku Volume: 30 Issue: 2 Pages: 68-79
  • DOI: 10.11259/jsg.30.68
  • NAID: 130005106001
  • ISSN: 0914-3866, 1884-7323
  • Peer Reviewed
• [Presentation] Factors affecting the selection of denture adhesive or oral moisturizers (2017)
  • Author(s): Tsubakida, K., Sato, Y., Kitagawa, N., Shimodaira, O., Nakatsu, M., Aoyagi, K., Kakuda, T., Takayama, M. and Ishihara, M.
  • Organizer: 95th General Session & Exhibition of the International Association for Dental Research
  • Place of Presentation: San Francisco, United States
  • Year and Date: 2017-03-25
  • Int'l Joint Research
• [Presentation] Measurement of retention forces of mandibular complete dentures (2017)
  • Author(s): Ishihara, M., Sato, Y., Kitagawa, N., Shimodaira, O., Nakatsu, M., Aoyagi, K., Takayama, M and Tsubakida, K.
  • Organizer: 95th General Session & Exhibition of the International Association for Dental Research
  • Place of Presentation: San Francisco, United States
  • Year and Date: 2017-03-24
  • Int'l Joint Research
• [Presentation] 口腔内測定システムとFEAを用いた義歯支持粘膜の弾性率測定方法の確立 (2016)
  • Author(s): 髙松直也，佐藤裕二，北川 昇，下平 修，磯部明夫，上澤祐子，田中里美
  • Organizer: 第63回昭和大学学士会総会
  • Place of Presentation: 東京
  • Year and Date: 2016-11-26
• [Presentation] 口蓋床正中部のリリーフが支持力に及ぼす影響 (2016)
  • Author(s): 田中里美，佐藤裕二， 北川 昇，下平 修，磯部明夫，上澤祐子，髙松直也，大森友花
  • Organizer: 第63回昭和大学学士会総会
  • Place of Presentation: 東京
  • Year and Date: 2016-11-26
• [Presentation] 加齢による義歯支持粘膜の性状と疼痛閾値の解析 (2016)
  • Author(s): 磯部明夫，佐藤裕二，北川 昇，下平 修，上澤祐子，髙松直也，田中里美
  • Organizer: 第23回日本歯科医学会総会
  • Place of Presentation: 博多
  • Year and Date: 2016-10-22
• [Presentation] The effects of relief of palatal plates on supporting ability (2016)
  • Author(s): Tanaka, S., Sato, Y., Kitagawa, N., Shimodaira, O., Isobe, A., Kamisawa, Y., Takamatsu, N. and Omori, T.
  • Organizer: 40th Annual Meeting of the European Prosthodontic Association
  • Place of Presentation: Halle, Germany
  • Year and Date: 2016-09-17
  • Int'l Joint Research
• [Presentation] 上顎全部床義歯装着患者の義歯支持粘膜の弾性率の推定 ―実測値と有限要素解析の比較― (2016)
  • Author(s): 髙松直也，佐藤裕二，北川 昇，下平 修，七田俊晴，磯部明夫，上澤祐子，小川貴正，田中里実
  • Organizer: 第125回日本補綴歯科学会学術大会
  • Place of Presentation: 金沢
  • Year and Date: 2016-07-10
• [Presentation] リリーフが有歯顎口蓋床の支持力に及ぼす影響 (2016)
  • Author(s): 田中里実，佐藤裕二，北川 昇，下平 修，磯部明夫，上澤祐子，高松直也，飯島裕之
  • Organizer: 第125回日本補綴歯科学会学術大会
  • Place of Presentation: 金沢
  • Year and Date: 2016-07-10
• [Presentation] Elastic modulus estimation of denture support mucosa using FEA (2016)
  • Author(s): Takamatsu, N., Sato, Y., Kitagawa, N., Shimodaira, O., Isobe, A., Kamisawa, Y., Ogawa, T. and Tanaka, S.
  • Organizer: 94th General Session & Exhibition of the International Association for Dental Research
  • Place of Presentation: Seoul, Korea
  • Year and Date: 2016-06-24
  • Int'l Joint Research
• [Presentation] 上顎全部床義歯患者の圧痛閾値における三次元有限要素解析 (2015)
  • Author(s): 髙松直也，佐藤裕二，北川 昇，下平 修，磯部明夫，小谷祐子，小川貴正，小澤宏亮
  • Organizer: 日本補綴歯科学会 東京支部総会・第19回学術大会
  • Place of Presentation: 東京
  • Year and Date: 2015-11-29
• [Presentation] 口蓋床の荷重が粘膜沈下量と疼痛に及ぼす影響 ―口蓋粘膜沈下量と荷重量の同時測定装置の開発― (2015)
  • Author(s): 田中里実, 佐藤裕二, 北川 昇, 下平 修, 磯部明夫, 小谷祐子, 高松直也, 石原 広
  • Organizer: 日本補綴歯科学会 東京支部総会・第19回学術大会
  • Place of Presentation: 東京
  • Year and Date: 2015-11-29
• [Presentation] Relationship between oral mucosa and pressure-pain threshold in edentulous patients. (2014)
  • Author(s): Kotani, Y., Sato, Y., Kitagawa, N., Shimodaira, O.
  • Organizer: 92nd General Session & Exhibition of the International Association for Dental Research
  • Place of Presentation: Cape Town, South Africa
  • Year and Date: 2014-06-26
• [Presentation] 高齢無歯顎者の義歯床下粘膜の性状と疼痛閾値の関係 (2014)
  • Author(s): 小谷祐子，佐藤裕二，北川 昇，下平 修
  • Organizer: 第123回日本補綴歯科学会学術大会
  • Place of Presentation: 仙台
  • Year and Date: 2014-05-24