３次元有限要素簡易モデルを用いた顎関節部負荷の解析に関する研究

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  • A study on analysis of temporomandibular joint loading by a simplified three-dimensional finite element model

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Purpose: A simplified three-dimensional finite element model of the mandible, including the temporomandibular joint (TMJ), was developed, to examine the influences of changes in anatomical morphology on TMJ loading. The purpose of this study was to investigate the validity of the simplified model.<BR>Materials and Methods: Based on a young human dry skull, a numerical model of the mandible, including the TMJ, was developed. In this model, the mandible excepted the ramus of mandible, and the condyle was connected with the body of mandible using rigid elements. Contact elements allow slip and separation effects between the contact surface of the articular disk and the articular surface of the condyle or eminence. The magnitude and direction of the condylar displacement during clenching were measured by changes in the occlusion.<BR>Results: 1. In bilateral occlusion, bilateral condyles moved forward and upward.<BR>2. In unilateral occlusion, the balancing side condyle moved forward, upward, and inward. The working side condyle moved forward, upward, and outward, except for the unilateral 2 nd molar occlusion where the working side condyle moved backward, downward, and outward.<BR>Conclusions: The direction and magnitude of the condylar displacement were analogous to those of previous studies. This suggested that the simplified three-dimensional finite element model adopted in the present study may be useful in analyses of the TMJ.

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