安氏骨性几类最严重_骨性安氏ＩＩ类１分类错牙合的拔牙矫治

　　[摘要]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分类错牙合的临床疗效。方法：对10名前牙深覆盖达到8～11mm且ANB平均为7.4°伴Ⅲ°深覆牙合的恒牙期患者，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分类错牙合，其改善的关键在于上切牙内收前深覆牙合的矫治。
　　[关键词]骨性安氏II类1分类；深覆牙合；方丝弓技术
　　[中图分类号]R783.5[文献标识码]A [文章编号]1008-6455（2007）11-1554-03
　　
　　Extraction treatment of skeletal Class II division I malocclusion
　　MA Yu-xia,GUO Wei,LIU Ya-jun
　　（Department of Stomatology,Navy General Hospital,Beijing 100037,China）
　　
　　Abstract:ObjectiveTo investigate the effects of Edgewise technique with extraction treatmentin skeletal Class II division I malocclusion of permanent dentition. MethodsTen skeletal Class II division I malocclusion patients in permanent dentition with ANB 7.4° and overjet 8-11mm were treated by Edgewise technique with extract 4 first bicuspids, cephalometric measurements before and after treatment were done. ResultsAfter treatment, overjet and overbite of all patients were corrected to normal range.SNA,ANB,UI-NA,NA-PA were reduced by 1.9°（P 　　在垂直向上，相对于下颌平面，治疗后下切牙压低2.7mm(P