Ⅱ급 부정교합 치료 후 재발과 골격치성요소의 상관성
Correlationship of skeletodental factors to a relapse in class Ⅱ correctionn
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II급 부정교합 치료 후 일어나는 재발에 영향을 미치는 요소를 알아보기 위하여 치료 후 결과가 안정하게 유지된 군과 재발이 일어난 군으로 구분하여 골격 및 치성요소를 비교하였다. 치료 전과 치료 후 측모 두부방사선사진을 이용하여 t-test와 상관분석을 시행한 결과 다음과 같은 결론을 얻었다. 1. 안정군과 재발군 간에 치료 전 골격 및 치성 관계는 대체로 차이가 없었다. 2. 안정군에서 하악골의 전방성장이 더 많이 일어났다. 3. 안정군에서의 하악 전치는 더 직립되었으며 상악전치는 설측 경사가 적은 경향을 보였다. 4. 재발군에서 교합평면이 전하방으로 경사되는 경향을 보였다.
Abstract
The purpose of this study was to evaluate the postretention change of class II malocclusion treatment and to examine which factors were related to the relapse. Seventy-eight treated cases were divided into two groups according to the stability of treatment results. Various measurements in pre-treatment and post-treatment lateral cephalograms were evaluated and comparisons were drawn between the stable and relapse group by t-test and correlation analysis. 1. There were only a few differences in the skeletodental relationship in the pre-treatment phase between the stable and the relapse group. 2. Mandibles in the stable group were repositioned more anteriorly than those in the relapse group. 3. Mandibular incisors were more uprighted to the basal bone and maxillary incisors were less lingualized in the stable group than in the relapse group. 4. Occlusal plane was inclined forward and downward in the relapse group.
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