소아에서 이모장치가 하악골 및 측두하악관절에 미치는 영향에 관한 유한요소법적 분석
A Finite Element Analysis of effect of chin cap appliance on the mandible and temporomandibular joint children
유정회, 이상호,
소속 상세정보
유정회 ( Yoo Jeong-Hoe ) - 조선대학교 치과대학 소아치과학교실
이상호 ( Lee Sang-Ho ) - 조선대학교 치과대학 소아치과학교실
KMID : 0353319920160020427
Abstract
The purpose of this study was to investigate the stress distribution and displacement in the mandible and temporomandibular joint during application of chin cap. The dry skull of child in mixed dentition was used to make a 2-dimensional finite
element
model. It was composed of 765 elements and 1321 nodes.
An orthopedic forces, 500gm, was applied around the gnathion in three directions. The directions of retraction had three planes : the first was the plane connecting from the region of around the gnathion to condylion(A plane), the second was 20
degrees
upward from the first plane (B plane), the third was 50 degrees upward from the first plane(C plane).
@ES The results were as follows:
@EN 1. When the retraction was applied to A plane, the distribution of tensile stress was greater on the middle and posterior portion of condylar fossa, apex of condylar head, anterior portion of articular disc, distal portion of first molar,
posterior
portion of condylar neck and head. Particulary, it was concentrated on condylar head and neck. As the retraction was dire cted more upward, it was decreased totally and concentrated on the first molar.
2. When the retraction was applied to A plane, Compressive stress concentrated on the sigmoid notch and anterior portion of condylar head and neck. As the retraction was directed more upward, it moved form condylar head and neck toward anterior
teeth
portion and it was concentrated on second premclar.
3. When the retraction was applied to A plane, displacement was directed to posterior an superior in mandibular anterior body, mandibular posterior body, coronoid process, condylar head, middle and posterior portion of mandibular fossa. But it
was
directed to posterior and inferior in mandibular angle and ramus, anterior portion of condylar neck, anterior porion of mandiblar fossa, As the retraction was directed more upward, it was directed to posterior and inferior in coronoid process and
posterior protion of condylar neck. The posterior movement of mandible was decreased.
4. When the retraction was applied to A plane, the stress of mandibular body and ramus was small and it was distributed on compact bone. As the retraction was directed more upward, the stress was distributed widely on teeth and permanent teeth
germs.
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