Objective To investigate the effects of orthodontic treatment on the upper airway and surrounding structures in adult patients with skeletal class II malocclusion,and to evaluate the relationship between changes in the craniofacial morphology ,position of incisor and upper airway dimensions. Methods 36 adult patients with skeletal class II malocclusion were selected, including 20 with teeth extracted and 16 with teeth not extracted. Cephalometric analysis was performed before and after treatment by CASSOS software. Results No statistical difference was found in Phwl-psp and Phw2-Tb in both non-extraction group and extraction group after treatment. Ant. In Mx. Ht and In Mx Area increased by 1.08 mm2 and 117.37 mm2 respectively in non-extraction group( P <0. 05). Conclusions The upper airway dimensions can not be altered sagittally either by extraction or non-extraction orthodontic treatment in adult patients with skeletal class H malocclusion, so far as the lower incisor is not retracted extremely.%目的 研究拔牙与非拔牙矫正对成人骨性Ⅱ类错(牙合)气道及周围结构的影响,并分析可能的原因.方法 选择36例成人骨性Ⅱ类错(牙合)正畸结束病例,拔牙组20例,非拔牙组16例.用正颌外科模拟预测系统(CASSOS)软件测量患者治疗前后X线头颅侧位片,并对数据进行配对t检验.结果 拔牙组与非拔牙组的腭后气道(Phwl - psp)与舌后气道(Phw2 - Tb)在正畸前后均无显著变化(P＞0.05).非拔牙组的前颌间距离(Ant.In Mx.Ht)与颌间面积(lnMx Area)有所增加,差异有统计学意义.结论 成人骨性Ⅱ类错(牙合)畸形的掩饰性治疗,不论是否减数,在下前牙不过分内收的情况下,气道在矢状向的变化并不显著.
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