교정적 치아초기배열단계시 발생하는 치근 변화에 관한 주사전자현미경적 연구
ROOT SURFACE CHANGES DURING THE INITIAL LEVELING AND ALIGNMENT PHASE IN ORTHODONTICS:A SCANNING ELECTRON MICROSCOPIC STUDY
최정윤, 정규림,
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최정윤 ( ) - 경희대학교 치과대학 교정학교실
정규림 ( ) - 경희대학교 치과대학 교정학교실
KMID : 0361919980280040591
Abstract
The purpose of this study was to investigate the root resorption and repair pattern of human teeth according to the force magnitude, direction and duration during the initial leveling and alignment phase.
40gms to 500gms of force applied to the 37 experimental teeth with duration of 3 weeks to 7 months. Then, the experimental teeth were extracted. 13 control teeth were extracted without treatment.
The results are as follows:
1. 59.5% of 37 teeth exhibited root resorption. The initial resorption site was visible at the apex within 3 weeks with 100 gins samples, and the initial repair site was visible at the apex within 3 months with 400 gms samples. 2. Number of resorbed teeth increased with the duration of the for( ;,e
3. The depth of the resorption increased with the magnitude of the `,force.
4. The areas of resorbed root corresponded with the loading pattern.
5. The areas of resorbed root were highly correlated with the magnitude of the force.
The result of this study suggest that root resorption could occur during the initial leveling and alignment phase. These initial injuries are all small and insignificant. It is the extensive type of apical root resorption that must be regarded as deleterious to the function and stability of the tooth moved. During the initial leveling and alignment phase lighter force of the interrupted type and short treatment period would be favorable with regard to avoidance of root resorption and repair of resorbed root surface.
키워드
치근흡수;치아초기배열단계;주사전자현미경적 연구;root resorption;initial leveling and alignment phase;scanning electron microscopy
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