固定正畸对骨性Ⅱ类患者后牙合平面及上牙轴倾斜度的影响

目的：观察经固定正畸矫治的骨性Ⅱ类高角患者矫治后后牙合平面及上牙轴倾斜度的变化。方法：对13例经直丝弓矫治技术，拔除4颗双尖牙矫治完成的骨性Ⅱ类高角患者矫治前后的X线头颅侧位定位片进行相关项目的测量，结果进行统计分析。结果：治疗后，后牙合平面、U1-FH角及U7-FH角均减少，差异有统计学意义（P＜0.05）；U5-FH角增加，差异有统计学意义（P＜0.05）。结论：骨性Ⅱ类高角患者矫治后后牙合平面陡度减少，上颌牙牙轴由向心聚拢倾向于平行。

Effect of orthodontic treatment on the inclination of the posterior occlusion plane and the long axis of upper teeth in classIImalocclusion

Objective To evaluate the effect of orthodontic treatment on the inclination of the posterior occlusion plane and the long axis of upper teeth in class II malocclusion with vertical growth. Methods Lateral cephalograms of 13 patients of class II malocclusion with vertical growth were measured in related items. All the patients were treated by straight wire appliance and 4 premolars extraction. The measurements were analyzed statistically. Results After treatment, the inclination of the posterior occlusion plane,the angle of U1- FH and U7- FH reduced,and the difference differed statistically （P〈0.05）.The angle of U5- FH increased statistically too （P〈0.05）. Conclusion The posterior occlusal plane of class II malocclusion is less steep after the orthodontic treatment,and the more centripetal long axis of upper teeth tend to become more parallel.