骨性安氏Ⅱ类1分类错的拔牙矫治

Extraction treatment of skeletal Class Ⅱ division I malocclusion

目的:通过X线头影测量探讨方丝弓技术拔牙矫治恒牙期骨性安氏Ⅱ类1分类错的临床疗效。方法:对10名前牙深覆盖达到8～11mm且ANB平均为7.4°伴Ⅲ°深覆的恒牙期患者,采用方丝弓技术进行矫治,均拔除4个第一双尖牙,并对所有患者正畸治疗前后进行头影测量分析。结果:10例患者治疗后覆盖、覆牙合均达到正常,NA-PA平均减少4.4°,ANB减小2.3°,SNA减小1.9°。下颌Spee氏曲线与上颌补偿曲线明显整平。结论:应用方丝弓矫治技术拔牙治疗方法可以有效矫治恒牙期骨性安氏II类1分类错,其改善的关键在于上切牙内收前深覆的矫治。

Objective To investigate the effects of Edgewise technique with extraction treatment in skeletal Class II division I malocclusion of permanent dentition. Methods Ten skeletal Class II division I malocclusion patients in permanent dentition with ANB 7.4^o and overjet 8-11mm were treated by Edgewise technique with extract 4 first bicuspids, cephalometric measurements before and after treatment were done. Results After treatment, overjet and overbite of all patients were corrected to normal range.SNA,ANB,UI-NA,NA-PA were reduced by 1.9^o （P〈0.05）,2.3^o（P〈 0.01）,3.3mm （P〈0.01）,4.4^o （P〈0.05）respectively, Conclusion Skeletal Class II division I malocclusion in permanent dentition can be treated successfully by Edgewise technique with extraction 4 bicuspids