Segmented TMA T-loop spring에 의한 견치 후방이동시의 응력분포에 관한 광탄성법적 분석
A photoelastic study of the stress distribution of canine retraction by Segmented TMA T-loop spring
소속 상세정보
유필식/Yu PS
KMID : 0353320010250010025
Abstract
Retraction of the canines represents a fundamental stage in a considerable number of orthodontic treatment. The patient who have anterior arch length problems with anterior crowding require separate canine retraction. Controlled canine retraction requires the creation of a biomechanical system to deliver a predetermined force and a relatively constant moment to force ratio in order to avoid distal tipping movement. The segmented TMA T-loop spring, used for reciprocal space closure and described by Burstone, was used to achieve bodily movement of canine. Photoelastic analysis is a technique for the transformtion 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 stu요 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 1st. premolar extraction site and increased intrusive stress of upper 1st molar, regardless of T-loop position.
2. At 5mm 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 1st. premolar extraction site and mesial lower half of upper 1st. molar mesio-buccal root.
4. At 1mm activation, More anterior positing 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.
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