정상 교합과 부정교합에서의 상.하악골과 제 1 대구치 위치에 관한 비교연구
A comparative study about the position of upper and lower jaws, and first molars in normal occlusion and Angle's class I, II, III malocclusions
소속 상세정보
윤병모
안병근/이건주/김선해/박영주/한호진
KMID : 0361919930230040633
Abstract
There has been so much controversies about the position of upper and lower jaws, and their first permanent molars in normal occlusion and Angle's class I * Ⅱ* Ⅲmalocclusions.
So, the purpose of this study is to compare the position of upper and lower jaws, and their first molars in normal occlusion and Angle's class Ⅰ븼콝Ⅲmalocclusions by lateral cephalometric analysis.
The sample consisted of one hundred and twenty girls(thirty in each group) who had completed growth.
@ES The findings of this study were as follows ;
@EN 1. In class I malocclusion, both maxilla and mandible were slightly posterior position than normal occlusion, but they showed harmonious relationship.
2. In class Ⅱmalocclusion, the mandible was greatly retruded, and the maxilla was also slightly retruded to the cranial base as compared with normal occlusion.
3. In class Ⅲmalocclusion, the maxilla was significantly retruded to the cranial base. But no significant difference was found in mandibular position as compared with normal occlusion.
4. The maxillary first molar was located at posterior position in class Ⅱmalocclusion, and anterior position in class Ⅲmalocclusion to the cranium, so that the rotation of mandible was infiuenced by that.
5. The mandibular first molar showed constant relationship to the mandible in all four groups. but different position to the cranial base in direct proportion to the mandibular position.
6. On the treatment planning of class Ⅱmalocclusion, it seems to be better to promote the mandibular horizontal growth by inhibiting the vertical growth of maxillary molar area, and on the treatment planning of class Ⅲmalocclusion, it seems to
be
better to promote the antero-inferior growth of maxilla and to promote the mandibular vertical growth by inducing the vertical growth of maxillary molar area.
KOREA J. ORTHOD 1993 ; 23(4) : 633-644.
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