目的:比较口外弓颈牵引推磨牙远移治疗前后的颅面、牙齿的角度变化。方法:调取2002～2005年间完成正畸治疗病例18例作回顾性研究,均为安氏Ⅱ类错低角或均角病例,应用口外弓颈牵引推磨牙远移+方丝弓矫治技术不拔牙矫治。对治疗前后X线头影测量数据做统计学分析。结果:SNA平均减小1.5°,SNB平均增加0.8°,FMA平均增加1.2°,GoGn-SN平均增加2.2°,治疗前后比较有显著性差异(P<0.05)。结论:口外弓颈牵引推磨牙远移能有效改善颌骨侧貌,改善低角状况,促使下颌骨顺时针方向旋转。 OBJECTIVE: To compare the changes of craniofacial and dental angles before and after the treatment of mouth molars traction and molars. Methods: We retrieved 18 cases of orthodontic treatment from 2002 to 2005, all of them were Class Ⅱ malocclusion or angle-angle malocclusion cases. Do not pull teeth correction. Before and after treatment of X-cephalometry measurements do statistical analysis. Results: The average SNA decreased by 1.5 °, the average SNB increased by 0.8 °, the average FMA increased by 1.2 ° and the average GoGn-SN increased by 2.2 °. There was a significant difference between before and after treatment (P <0.05). CONCLUSION: The extraoral bow and neck traction can promote distal contouring of mandible, improve the low-angle condition and cause the mandible to rotate clockwise.