目的：了解拔牙与非拔牙矫治在治疗安氏II类错时牙槽嵴高度的变化情况。
Objective: Research the change in alveolar bone crest height among 2-phase treatment, pendulum and extraction treatment in Class II malocclusion.
目的研究替牙期假性安氏III类错的牙颌特征，为早期诊断提供依据。
Objective To find the dentoskeletal characteristics of pseudo Class III malocclusion in mixed dentition.
结论安氏三类错合伴开合患者，行双颌正颌手术后，其开合距离与颏部形态变化有相关性。
ConclusionMesioclusion with open bite patients after orthognathic surgery, their open-bite distance has correlation with chin form.
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