construction of criteria of evaluation of bone quality and selection of implant size with optimization method

• Project/Area Number: 24592892
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Prosthetic dentistry
• Research Institution: Hokkaido University
• Principal Investigator: Takayama Yoshiyuki 北海道大学, 大学病院, 講師 (30236369)
• Co-Investigator(Kenkyū-buntansha): YOKOYAMA ATSURO 北海道大学, 大学院歯学研究科, 教授 (20210627) ; SAITO HIROKO 北海道大学, 北海道大学病院, 助教 (10511686)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2013: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2012: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
• Keywords: デンタルインプラント / 骨質 / 有限要素法 / 最適化 / 応答曲面 / インプラント / 海綿骨 / 診断

Outline of Final Research Achievements

We constructed a response surface with the maximum equivalent strain as a response value and size of an implant as explanatory variables based on the three-dimensional finite element (FE) analysis. Diameter and length of the implants were minimized by optimized calculation with the maximum equivalent strain (MES) in bone limited to the physiological limit. Young’s modulus of cancellous bone less than 0.5GPa lead to failure of optimization and caused MES around the bottom of the implant. However, the analysis with an FE model constructed from CT image showed reduction of the stress and change of the location of MES compared with the results of the optimization. This difference was considered to be due to the variety of the density of the bone depending on the site.

Research Products

• [Presentation] 生体力学的解析によるインプラントの直径および長さの骨質に応じた最適化 (2013)
  • Author(s): 上田奈々，高山芳幸，粥見翔，横山敦郎
  • Organizer: 日本補綴歯科学会第122回学術大会
  • Place of Presentation: 福岡国際会議場（福岡市）
• [Presentation] 皮質骨の厚さと海綿骨の物性がインプラント周囲骨のひずみに及ぼす影響 (2012)
  • Author(s): 上田奈々、高山芳幸、粥見翔、横山敦郎
  • Organizer: 日本補綴歯科学会第121回学術大会
  • Place of Presentation: 神奈川県民ホール（横浜市）
• [Presentation] 皮質骨の厚さと海綿骨のヤング率がインプラント周囲の骨のひずみに及ぼす影響：インプラント体の長さと直径の変更による対応 (2012)
  • Author(s): 高山 芳幸，上田 奈々，粥見 翔，横山 敦郎
  • Organizer: 日本口腔インプラント学会東北・北海道支部学術大会
  • Place of Presentation: 奥羽大学（郡山市）