目的:观察未治疗的安氏Ⅲ类错患者颈椎骨龄CS1-CS6期下颌骨的生长旋转特点,为安氏Ⅲ类错患者的生长改向提供参考。方法:收集安氏Ⅲ类错患者329例,男144例,女185例;拍摄头颅定位侧位片,按性别和颈椎CVM分期分组,应用Winceph8.0头影测量软件测量下颌角(ArGo’Me)、平面角(Occlusal pl.to SN)、下颌平面角(Go-Gn to SN)和面高比(S-Go/N-Me)值,数据采用SPSS16.0方差分析后进行组间多重对比(LSD-t检验)。结果:男性安氏Ⅲ类错患者SN-OP呈现先升后降趋势,CS3和CS6组间差异有统计学意义(P﹤0.05);在CS4-CS6期,ArGo’Me逐渐减小,S-Go/N-Me逐渐增加,CS4和CS6组间差异明显(P分别为0.041和0.009)。女性安氏Ⅲ类错患者SN-OP、SN-GoGn和ArGo’Me均在CS4-CS5有明显减小(P﹤0.05);S-Go/N-Me在CS4-CS5期增加(P=0.006)。结论:安氏Ⅲ类错患者下颌骨生长总体上呈向前上旋转趋势,在CS4期之后旋转明显。提示对安氏Ⅲ类错患者进行生长改向治疗时,应考虑到生长发育高峰期之后下颌骨的前上旋转对预后的影响。 OBJECTIVE: To observe the characteristics of mandibular growth and rotation in CS1-CS6 cervical spine age patients with untreated Class III malformations, and to provide a reference for the growth of patients with Class III malocclusion. Methods: A total of 329 patients with Malignant Class Ⅲ malocclusion were enrolled in this study. They were 144 males and 185 females. The skull position lateral radiographs were taken and classified according to gender and cervical CVM. Winsph8.0 cephalometric software was used to measure the mandible angle (ArGo ’ Me), Occlusal pl.to SN, Go-Gn to SN and S-Go / N-Me were calculated and analyzed by SPSS 16.0 ANOVA Multiple comparison (LSD-t test). Results: The SN-OP of male patients with Class Ⅲ malocclusion increased first and then decreased, the difference between CS3 and CS6 was statistically significant (P <0.05); in the stage of CS4-CS6, ArGo’Me decreased gradually and S -Go / N-Me increased gradually, with significant difference between CS4 and CS6 groups (P = 0.041 and 0.009, respectively). The SN-OP, SN-GoGn and ArGo’Me in women with Class III malocclusion were all significantly decreased in CS4-CS5 (P <0.05); S-Go / N-Me increased in CS4- 0.006). Conclusion: The growth of mandible in Class Ⅲ malocclusion patients showed a general tendency of forward rotation, which was obvious after CS4. Prompt Class III malformation patients with growth redirection treatment should take into account the peak growth and development after the mandibular anterior spin on the prognosis.