AIM:To investigate the difference of mandibular position change as well as soft tissue profile change between conventional anchorage and mini -implants anchorage in vertical control of adult molars with hyperdi-vergent Class II malocclusion.METHODS:32 patients aged 18 -35 with Angle Class II hyperdivergent malocclusion were divided into 2 groups (n =16)and treated with mini -implant anchorage (G1 )and conventional anchorage (G2)respectively.The pretreatment and posttreatment lateral cephalometric radiographs of the patients were used for the measure of skeletal,dental and the profile changes.RESULTS:In sagittal direction,the G1 group showed less mesial movement of the maxillary first molars than G2 group 〔(0.60 ±1.20 )mm Vs (1.63 ±1.04 )mm, (P <0.05)〕.In vertical direction,the maxillary molars were intruded in G1 group by(1.59 ±1.28)mm,whereas they were extruded in G2 group by (0.17 ±0.51)mm(P <0.05).After treatment,G1 group showed a mandibular counterclockwise rotation of (0.57 ±0.45 )°,anterior vertical dimension of the lower face (AFH)reduction of (1.63 ±2.45)mm,and a more prominent chin(vs pretreatment or G2 group,P <0.05).CONCLUSION:Com-pared with conventional anchorage,mini -implants are more effective in the control of vertical maxillary molars for the tooth extraction treatment of adults with Angle Class II hyperdivergent malocclusion.Mandible can be rotated counter-clockwise so that the lateral profile can be more harmonious and beautiful.%目的：探讨使用种植钉支抗和常规支抗对成人安氏Ⅱ类高角型患者的上颌磨牙进行垂直向控制后，下颌骨位置变化以及软组织面部侧貌变化。方法：选取32例成人安氏Ⅱ类高角拔牙患者矫治前后的头颅侧位片，其中种植钉支抗组（G1）和常规支抗组（G2）各16例，年龄18～35岁。利用矫治前（T1）、矫治后（T2）的头颅侧位片，分别测量其下颌骨旋转量、磨牙压低量及软组织面部侧貌的变化。结果：矢状向：G1组第一磨牙向近中移动距离为（0．60±1．20）mm，G2组为（1．63±1．04）mm（P ＜0．05）。垂直向：G1组第一磨牙压低（1．59±1．28）mm，G2组第一磨牙伸长（0．17±0．51）mm；G1组矫治后，因上颌磨牙压低而引起了下颌骨逆时针旋转（0．57°±0．45°）、下面高（AFH）减小（1．63±2．45）mm，颏部更加突出，除与其矫治前相比均有统计学差异（P ＜0．05）外，分别与 G2组矫治效果相比，亦均有统计学意义（P ＜0．05）；而 G2组中，上述各指标分别与其矫治前相比均无统计学差异（P ＞0．05）。结论：对于成人安氏Ⅱ类高角拔牙患者的矫治效果而言，种植钉支抗较常规支抗能更好的垂直向控制上颌磨牙，下颌骨发生逆时针旋转，面部侧貌更加协调、美观。
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