유한요소법에 의한 하악제1대구치의 Cervical Traction의 효과에 관한 역학적 연구

• 영문명: A FINITE ELEMENT ANALYSIS OF THE DISPLACEMENT AND STRESS DISTRIBUTION OF HUMAN DRY MANDIBLE DURING THE MANDIBULAR FIRST MOLAR CERVICAL TRACTION
• 발행기관: 대한치과교정학회
• 저자명: 안의영(Eui-Young Ahn) 정규림(Kyu-Rhim Chung)
• 간행물 정보: 『The Korean Journal of Orthodontics』제19권 제1호, 45~58쪽, 전체 14쪽
• 주제분류: 의약학 > 기타의약학
• 파일형태: PDF
• 발행일자: 1989.04.30

영문 초록

This study was undertaken to analyze the displacement and stress distribution in the mandible according to the pulling directions during mandibular first molar cervical traction after mandibular second molar extraction. The 3-dimensional finite element method(FEM) was used for a mathematical model composed of 594 elements and 1019 nodes. An orthodontic force, 450gm, was applied to the each mandibular first molar in parallel, and below the occlusal plane by 7° and 25° and meet the midsagittal plane by 40° toward posterior direction. The results were as follows: 1. Mandibular teeth were displaced in more downward, posterior and lateral direction. Especially high stress was noted in case of parallel pull than in case of below the occlusal plane by 7° and 25°. 2. Mandibular first molar was moved bodily. 3. Generally, alveolar bone, mandibular body, ascending ramus and mandibular angle portion were displaced in downward, posterior and lateral direction. But coronoid process was displaced in downward, forward and lateral direction, and anterior and inner middle portion of condyle head and neck were displaced in downward, forward and medial direction, and posterior and outer middle portion of condyle head and neck were displaced in upward, forward and medial direction. 4. Maximum stress was observed at the condyle head and neck portion. With steeper direction of force, condyle head and neck showed more stress than parallel relation to the occlusal plane.