Segmented TMA T-loop spring에 의한 견치 후방이동시의 응력분포에 관한 광탄성법적 분석
A photoelastic study of the stress distribution on canine retraction by segmented TMA T-loop spring
유필식, 윤상필,
소속 상세정보
유필식 ( ) - 조선대학교 치과대학 교정학교실
윤상필 ( ) - 조선대학교 치과대학 교정학교실
KMID : 0361920010310020199
Abstract
The segmented TMA T-loop spring, used for reciprocal space closure and described by Burstone, was used to achievebodily movement of canine. Photoelastic analysis is a technique for the transformation of internal stress into visible light patterns. The two-dimensional photoelastic stress analysis was performed, and stress distribution was recorded by photography. The purpose of this study was to visualize photoelastically the distribution of forces transmitted to the alveolus and surrounding structures using new segmented TMA T-loop spring for canine retraction.
The results were as follows:
1. Decreased activation produced decreased stress of upper 1stt premolar extraction site and increased intrusive stress of upper 1st. molar, regardless of T-loop position.
2. At 5uun activation, More posterior positioning of T-loop produced an increased stress in upper 1st. premolar extraction site.
3. At 3mm activation. More posterior positioning of T-loop produced an increased stress in upper 1stt premolar extraction site and -inesial lower half of upper 1st. molar mesio-buccal root.
4. At 1mm activation, More anterior positioning of T-loop produced an increased stress in upper mesial and blew apex area of upper canine root.
5. 0.25 B/L ratio and 3mm activation produced bodily movement of canine.
To summarize, desired tooth movement and anchorage requirement is possible by altering the activation and mesio-distal position of the T-loop spring.
키워드
Segmented TMA T-loop spring;견치 후방견인;광탄성 응력분석;Segmented TMA T-loop spring;Canine retraction;Photoelastlc analysis
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