치주인대의 응력 분포 양상에 관한 실험 연구
AN EXPERIMENTAL STUDY ON THE STRESS DISTRIBUTION IN THE PERIODONTAL LIGAMENT
최광철, 김경호, 송철규, 한정윤,
소속 상세정보
최광철 ( ) - 연세대학교 치과대학 교정학교실
김경호 ( ) - 연세대학교 치과대학 교정학교실
송철규 ( ) - 연세대학교 치과대학 교정학교실
한정윤 ( ) - 연세대학교 치과대학 교정학교실
KMID : 0361920010310010015
Abstract
In order to achieve a desirable tooth movement, it is of great importance to control the M/F ratio and to know the location of the center of resistance.
The purpose of this study was to locate the center of resistance and the axis of rotation, and to estimate the stress distribution in the periodontal ligament with experimental model.
After preparing a model of an upper canine with a simulated periodontal ligament and alveolar bone, the force and moment were applied. The tooth movement was traced using measuring device with LVDTs(Linear variable differential transformers) that can measure three dimensional tooth movement in real time.
The results were as follows.
1. The location of center of resistance by transverse force was 29% of root length measured from alveolar crest to apex regardless of force magnitude. The position of the crater of resistance is more coronal than that of two-dimensional model(42%).
2. The center of resistance and the axis of rotation coincide when couple moment was applied.
3. As the magnitude of moment increases, tooth tends to extrude irrespective of the direction of the moment.
4. The relationship between location of force and axis of rotation (a x b =49.6mm) was obtained. A tooth movement
can be predicted through this formula.
5. The centers of rotation by transverse force were plotted linearly.
키워드
치주인대;응력 분포;저항중심;회전축;periodontal ligament;stress distribution;center of resistance;center of rotation
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