两种不同拔牙方式矫治成人骨性反牙合的硬软组织改变的对比研究

Study on two different extraction methods for adult skeletal Class III malocclusion of the hard and soft tissue contrast

目的:探讨下颌单颌拔牙与双颌拔牙矫治成人骨性反牙合的硬软组织改变的差异。方法:选取成人骨性反牙合患者31例,其中拔除4个前磨牙矫治(甲组)13例,下颌单颌拔除2个前磨牙矫治(乙组)18例。应用X线头影测量对矫治前后的硬软组织变化进行测量。结果:两组SNA、SNB、ANB矫治前后的变化无明显差异。甲组下切牙内收与下唇的变化更为显著,下唇凸度明显减小,甲组面型侧貌改变较乙组更为显著。结论:单颌拔牙模式适用于上颌无拥挤或轻度拥挤的轻中度骨性反牙合患者;双颌拔牙模式适用于上颌伴中重度拥挤的中度骨性反牙合患者。

Objective：To investigate the hard and soft tissue changes of single mandibular extraction with bimaxillary extraction orthodontic treatment of adult skeletal Class III malocclusion. Method：adult skeletal Class III malocclusion pa-tients with 31 cases,the extraction of four premolars in 13 cases（group A）,single extraction of mandibular two premolars in 18 cases （group B）. Application of X-ray cephalometric technique on the hard and soft tissue changes before and after treatment was measured,the measurement results were analysis. Result：there was no significant difference on SNA,SNB and ANB in two groups before and after treatment. Changes of lower anterior teeth and lip retraction in group A were more prominent,also the facial profile changes were significantly more than group B. Conclusion：single lower extraction mode for mild to moderate skeletal Class III cases with no crowd or mild crowd in the maxillary;bimaxillary extraction model suitable for maxillary with moderate or severe congestion in skeletal Class III malocclusion patients.