하악골 과두부의 운동 방향에 따른 유한요소법에 의한 삼차원적 응력해석

THE THREE DIMENSIONAL STRESS ANANYSIS ON VARIOS DIRECTIONS OF THE MANDIBULAR CONDYLE MOVEMENT BY USING FINITE ELEMENT METHOD

The condyle head of mandible was usually influenced by the stressful forces generated from a voluntary movement of bone fragment after the sagittal ramus osteotomy which would be mainly performed for the mandibular deformity patient. In this study we measured the stress values exerted on condyle and evaluated which area of condyle had a more stress concentration while condyle head moved in X, Y and Z axis by using a 3 dimensional finite element model. The resule were as follows 1. On bodily movement, the value of maximum force was 40.98㎏/㎝2 at the (-X) direction and the stress area was the center of superioposterior nonarticular area of the condyle. 2. On rotational movement, the value of maximum force was 173.1㎏/㎝2 at the (+Y) direction and the stress area was the anterior area of condyle neck. 3. From the general point of view, there were more stress on rotational movement than on bodily movement. 4. The stress concentration area was the condyle head on bodily mevement and the condyle neck on rotational movement. 5. From the result of this study, We found out that this results were a correspondance with clinical predictions in which a condyle head got the most stress concentration only when a condyle head in the posterior position and posterior rotational position during orthognathic surgery. 6. The results of this study show that we should consider not to place the condyle head in the posterior position and posterior rotational position during orthognathic surgery.