Three-dimensional finite element analysis using human trabecular models and forces on implants as predicted from occlusal forces on the remaining teeth in the implant treatment planning phase

• Project/Area Number: 16K11588
• 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: Niigata University
• Principal Investigator: STEGAROIU Roxana 新潟大学, 医歯学系, 准教授 (10303140)
• Co-Investigator(Kenkyū-buntansha): 荒井 良明 新潟大学, 医歯学総合病院, 准教授 (10301186) ; 田中 茂雄 金沢大学, フロンティア工学系, 教授 (20262602) ; 山田 一穂 新潟大学, 医歯学総合研究科, 非常勤講師 (20397152) ; 黒川 孝一 新潟大学, 医歯学系, 准教授 (60215085)
• Research Collaborator: YAMAZAKI Yuta
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 歯学 / 骨応力予測 / 咬合力

Outline of Final Research Achievements

With patients’ informed consent, cone-beam CT data of unilateral free-end edentulous ridges, occlusal forces and occlusal contact registrations, obtained for implant treatment planning purposes, were combined with micro-CT data of implants and patient superstructures to create 3D finite element (FEM) models in which trabecular structure, implants, superstructures and occlusal contacts were simulated with high accuracy ensuring detailed stress analyses. To predict in the treatment planning phase the implant forces required for the FEM analyses, maximum occlusal forces measured with pressure-sensitive sheets on the remaining teeth before implant treatment and on implants after superstructure set were analyzed by linear regression analysis. A positive correlation was found between implant occlusal forces and occlusal forces on the remaining teeth, as well as on the posterior teeth of the same side with the edentulous ridge to be restored with implants.

Academic Significance and Societal Importance of the Research Achievements

対象者の術前に採取したインプラント予定側の残存歯および臼歯部の咬合力それぞれと上部構造装着後のインプラント咬合力測定値との間に正の線形相関が認められたことは３次元有限要素解析に必要となるインプラント咬合力を術前に推定するには有用であると考えられる。
また、本研究によって成立させたヒト生体骨梁モデルの作成手法および荷重条件の設定手法は、さらなる臨床症例において計画段階でのインプラント周囲骨の応力予測への展開が可能となると考える。

Research Products

• [Journal Article] Implant Presence Influences Occlusal Force on Adjacent Tooth: Preliminary Results. (2018)
  • Author(s): Roxana Stegaroiu, Yoshiaki Arai, Yuta Yamazaki, Kazuho Yamada, Koichi Kurokawa, Shigeo Tanaka
  • Journal Title: Journal of Dental Research Volume: 97 (Special Issue B) Pages: 1497-1497
  • Peer Reviewed
• [Journal Article] Finite Element Analysis of Implant-embedded Mandibular Model from Patient Data (2017)
  • Author(s): Roxana Stegaroiu, Kouichi Kurokawa, Kazuho Yamada, Yoshiaki Arai, Hideyoshi Nishiyama, Shigeo Tanaka
  • Journal Title: Journal of Dental Research Volume: 96 (Special Issue A) Pages: 3903-3903
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 片側遊離端大臼歯欠損のインプラント治療が残存歯咬合力負担に及ぼす影響 (2019)
  • Author(s): 山崎裕太，荒井良明 ，ロクサーナ・ステガロユ，高嶋真樹子，河村篤志，黒川孝一
  • Organizer: 公益社団法人日本補綴歯科学会 第128回学術大会
• [Presentation] Implant Presence Influences Occlusal Force on Adjacent Tooth: Preliminary Results. (2018)
  • Author(s): Roxana Stegaroiu, Yoshiaki Arai, Yuta Yamazaki, Kazuho Yamada, Koichi Kurokawa, Shigeo Tanaka
  • Organizer: The 96th General Session of IADR/PER
  • Int'l Joint Research
• [Presentation] 下顎片側最後方大臼歯欠損のインプラント治療が咬合力分布へ及ぼす影響. (2018)
  • Author(s): 山崎裕太，荒井良明 ，Roxana Stegaroiu，高嶋真樹子，黒川孝一
  • Organizer: 第48回公益社団法人日本口腔インプラント学会学術大会
• [Presentation] Implant Presence Influences Occlusal Force on Adjacent Tooth: Preliminary Results. (2018)
  • Author(s): Roxana Stegaroiu, Yoshiaki Arai, Yuta Yamazaki, Kazuho Yamada, Koichi Kurokawa, Shigeo Tanaka.
  • Organizer: The 96th General Session of IADR
  • Int'l Joint Research
• [Presentation] Finite Element Analysis of Implant-embedded Mandibular Model from Patient Data (2017)
  • Author(s): Roxana Stegaroiu, Kouichi Kurokawa, Kazuho Yamada, Yoshiaki Arai, Hideyoshi Nishiyama, Shigeo Tanaka
  • Organizer: The 95th General Session of IADR
  • Place of Presentation: Moscone Center West, San Francisco, California, USA
  • Year and Date: 2017-03-22
• [Presentation] A new method to predict stress around dental implants using 3D-finite element method (FEM) with patient computed tomography images and bite force data (2017)
  • Author(s): Roxana Stegaroiu, Kouichi Kurokawa, Kazuho Yamada, Yoshiaki Arai, Hideyoshi Nishiyama, Shigeo Tanaka
  • Organizer: Congresul Roman de Stomatologie cu Participare Internationala (The Romanian Dentistry Congress with International Participation, 2017)
  • Int'l Joint Research / Invited
• [Presentation] インプラント臨床例と並行して行った咬合力荷重ヒト生体骨梁モデルの3次元有限要素解析 (2016)
  • Author(s): Stegaroiu Roxana, 黒川 孝一 , 山田 一穂, 荒井 良明, 西山 秀昌
  • Organizer: 第46回日本口腔インプラント学会学術大会
  • Place of Presentation: 名古屋国際会議場（愛知県名古屋市）
  • Year and Date: 2016-09-16