open access

https://doi.org/10.14943/doctoral.k11247

https://hdl.handle.net/2115/58159

インプラントの咬合調整時の咬合力が咬合圧分布に及ぼす影響 : ３種類の咬合力の比較

英語

finite element analysis

2014-03-25

Hokkaido University

26

Purpose:The purpose of this study was to investigate the influence of occlusal forces(the contractile force of masticatory muscles) exerted during occlusal adjustment on the distribution of the forces among teeth, implants, and TMJs in intercuspal clenching in cases with bilateral missing molars and premolars by using finite element analysis.Materials and Methods: A three-dimensional finite element model of the mandible with eight implants in the premolar and molar regions was constructed. Linearly elastic material properties were defined for all elements except the periodontal ligament, which was defined as nonlinearly elastic. The TMJs and antagonists were simplified and replaced with nonlinear springs. Antagonists were assumed to be natural teeth or implants and had two- or three-stage displaceability. We constructed FE models in which occlusal adjustment with three kinds of occlusal force (40N as a light bite, 200N as a hard bite, and 400N as a maximum biting force) was performed. The clearance by occlusal adjustment was decided beforehand with a trial-and-error method so that the occlusal forces were distributed similarly to the distribution of the natural dentition. Each model was evaluated under loads of 40N, 100N, 200N, 400N, and 800N to determine the distribution of occlusal forces on the teeth and implants.Results: The occlusal forces were concentrated on the most posterior implants while the load was larger, and the percentage of bearing force at the TMJ was small, and vice versa.Conclusion: Maximum biting force was better for occlusal adjustment to prevent overloading of the most posterior implant.

2014-03-25

甲第11247号

博士(歯学)

(主査) 教授 横山 敦郎, 教授 舩橋 誠, 教授 佐野 英彦

歯学研究科（口腔医学専攻）

博士論文

Version of Record