양측 구치부 결손시 측두하악관절원판의 3차원 유한요소법적 응력 분석
A Three dimensional finite analysis of stress on TMJ disk of the dentated skull with bilateral posterior molar missing
이승훈, 강동완,
소속 상세정보
이승훈 ( ) - 조선대학교 치과대학 보철학교실
강동완 ( ) - 조선대학교 치과대학 보철학교실
KMID : 0353319980220020259
Abstract
The purpose of this presentation is to analyze the displacement and mechanical stress on the articular disk during the unilateral and bilateral clenching tasks on the three
dimensional finite element model of the dentated skull with the condition of bilateral posterior molar missing.
For this study, the CAD data through digitizer(Summa Sketch IH,USA) were extracted from tomograms of the dentated skull in the frontal plane at 1.0mm intervals in TMJ area or 2.Omm intervals in the area except TMJ intervals and a three-dimensional model of 98,394 finite elements and 38,321 nodes is constructed by the CAD program. The loading conditions of mandible at clenchings, Korioth´s and Nelson´s data were used, and Heo´s data on the loading and constraint conditions were applied to maxilla.
The displacement and mechanical stress on articualr disk can be summarized as follows.
1. The maximum compressive stress level on the disk with posterior molar missing was
greater than that on the disk with the full dentition side during bilateral clenching.
2. The disk on the working side of the model with posterior molar missing showed the higher stress co itrary to the disk on the balancing side on -the full dentition model
during unilateral Benching.
From this result, there may be a possibiliy that the unilateral clenching to the occlusal condition of bilateral posterior molar missing may contribute in part to the TMJ pathology, although three dimensional finite element analysis of TMJ disk varing with occlusal condition durring clenchings is not enough to explain the role of occlusion as an etiologic factor of TMD.
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