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目的:比较不同拔牙模式矫治的轻度骨性Ⅲ类错牙合成人患者的侧貌变化。方法:选择40例诊断为设计拔除4个前磨牙或第三磨牙矫治的轻度骨性III类错牙合的成人病例,分为两组,每组各20例。用头影测量分析法比较矫治前后的变化以及软硬组织的相关性。结果:拔除前磨牙组变化主要在于内收上下前牙。拔除第三磨牙组在于唇倾上前牙,软组织改变分别是内收下唇和唇倾上唇代偿(P<0.05)。软硬组织的变化具有一定相关性(P<0.05)。结论:不同拔牙模式对轻度骨性Ⅲ类错牙合患者矫治后侧貌的改变是有差别的,但在一定程度上都能改善凹面型和颏部形态。“,”Objective:To compare the profile changes after orthodontic treatment with two extraction models in mild skeletal Class III adult patients. Method:40 cases who could choose premolar or third-molar extraction models were equally divided into 2 groups based on the practical extraction position. Cephalograms were taken at initial visit and finish time for all patients and analyzed by 10 skeletal and 11 soft-tissue measurements. Result:The premolar-extraction group showed signifi-cant decreases in∠U1-NA,∠L1-NB angles and retrusion of the lower lip (P<0.05). On the contrary,the third-molar-ex-traction group showed significant increase in∠U1-NA angle and protrusion of the upper lip(P<0.05). The profile changes in nasolabial angle,thickness of the upper lip,Z angle,retrusion of the lower lip and depth of the labiomental fold were cor-related with the movements of incisors (P< 0.05). Conclusion:Though different changes were found in two extraction mod-els,the facial concavity and the shape of chin could be corrected in some degree.