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目的：探讨骨性Ⅱ错牙合拔牙病例上颌切牙根吸收的影响。方法：选取32例方丝弓固定矫治器完成的病例，组别：骨性Ⅱ类拔牙组16（男性：8例女性：8例；年龄16.23±3.56；骨性 I 类拔牙组16例（男性：8例，女性：8例；年龄15.05±3.47），两组资料矫治前在性别、年龄、拥挤度、等指标上具有可比性，通过矫治前后的模型及全口曲面体层片测量计算2组矫治后上切牙牙根吸收量，应用SPSS19.0软件包对数据进行t检验分析。结果：（1）骨性I类拔牙组和骨性Ⅱ类拔牙组矫治前后存在显著性差异(2)骨性I类拔牙组与Ⅱ类拔牙组之间存在显著性差异( P<0.05)，结论：骨性I I类拔牙患者上前牙拔牙代偿治疗后，根吸收风险增加。“,”Objectives: To investigate the effection of root resorption in skeletal Ⅱmalocclusions(extraction).Methods: thirty-two patients with fixed orthodontics treatment by edgewise appliance were devided into two groups accroding to skeletal I (extraction)、and skeletal Ⅱmalocclusion(extraction). the average age of extraction skeletal Ⅱmalocclusion group was 16.23±3.56 years old, the average age of skeletal I extraction group was 15.05±3.47 years old ,Patients in two groups were comparable in gender, age, crowed degree at the commencement of treatment , The maxil ary incisors was evaluated on.Panoramic radiographs and models taken before after treatment. Results: Root resorption of incisor in skeletal Ⅱand skeletal Igroup after orthodontic treatment is significant(P< 0.05). The variation of root resorption inskeletalⅡbeween skeletal Igroup is significant(P< 0.05).Conclusion: Upper incisor compensation of skeletalⅡ may be one of theimportant factors which increases root resorption.