:Part 2. Disc displacement

概要

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This study simulated the influences of changes in the horizontal condylar angle and gonial angle on the disc displacement. A three-dimensional finite element model of the mandible including the temporomandibular joint (TMJ) and a model that changes the horizontal condylar angle and gonial angle were constructed. A load condition, which was clenching, was given to these models, and the direction of disc displacement was examined. The direction of disc displacement was analyzed with respect to changes in the horizontal condylar angle and gonial angle. The results were as follows: 1. In the standard model, the disc displaced forward and upward without displacement in the mediolateral direction. The lateral area of the disc displaced in the lateral direction, and the central and medial area of the disc displaced in the medial direction. 2. Changing the horizontal condylar angle influenced the mediolateral direction of the disc. When the horizontal condylar angle increased, the disc displaced further in the lateral direction. 3. Changing the gonial angle influenced the anteroupward direction of the disc. When the gonial angle increased, the disc displaced in the forward direction, and when the gonial angle decreased, the disc displaced further in the upward direction. Conclusions: It was found that changes in the horizontal condylar angle and gonial angle influenced the disc displacement.
一般社団法人日本顎関節学会の論文