經部固定 headgear 使用時 顔面頭蓋骨의 變位에 關한 張力計測法 및 有限要素法的 硏究

• 영문명: A FINITE ELEMENT AND STRAIN GAUGE ANALYSIS ON THE DISPLACEMENT OF CRANIOFACIAL COMPLEX WITH CERVICAL HEADGEAR
• 발행기관: 대한치과교정학회
• 저자명: 金顯順(Hyun-Soon Kim) 南東錫(Dong-Seok Nahm)
• 간행물 정보: 『The Korean Journal of Orthodontics』제17권 제2호, 185~198쪽, 전체 14쪽
• 주제분류: 의약학 > 기타의약학
• 파일형태: PDF
• 발행일자: 1987.12.31

영문 초록

This paper was undertaken to observe the displacement of craniofacial complex with cervical headgear and to compare narrowing or widening effect of palate by use of contraction or expansion face-bow, respectively. The 3-dimensional finite element method(FEM) was used for a mathematical model composed of 597 nodes and 790 elements and an electrical resistance strain gauge investigation was performed to validate the finite element model. The outer bow of cervical headgear was adjusted to be placed below the occlusal plane by 25° and met the midsagittal plane by 40°, and was loaded 1kg on each right and left hook toward posterior direction. The results were as follows 1. Generally, the maxillary teeth and facial bone were displaced in posterior, medial and downward direction. 2. It was the maxillary 2nd bicuspid that moved bodily. 3. The craniofacial complex rotated in a clockwise direction around the rotating axis which lay from the most posterior and lowest point connecting nasal crest of maxillary bone and vomer, progressively toward a more posterior, lateral and upward direction, anterior and upper area of pterygomaxillary fissure, base of medial pterygoid plate and laterally to the contact area of zygomatic arch with squamous part of temporal bone. 4. No contraction effect was observed by contraction face-bow when compared to the standard face-bow. 5. In case of expansion face-bow, the areas of maxillary 2nd bicuspid, molars and palate were expanded remarkably.