[摘要]目的：研究青少年双颌前突患者拔牙矫治前后上颌骨、下颌骨及前颅底的变化，为临床预测矫治后疗效提供临床依据。方法： 对17名青少年双颌前突患者拔牙矫治前后的8项硬组织指标进行对比，通过配对t检验来评价治疗后患者上颌骨、下颌骨及前颅底的生长变化。结果：8项硬组织测量指标中的5项角度指标Y轴角、N-S-ANS、S-N-ANS、N-S-Gn和S-N-Gn矫治前后的改变均无统计学意义，三项长度测量指标S-N、S-ANS、S-Gn矫治前后的改变均有统计学意义，S-N平均增大1.89mm，S-ANS平均增大2.97mm，S-Gn平均增大5.43mm。结论： 可以认为青少年双颌前突患者拔牙矫治前后上颌骨、下颌骨及前颅底的生长方向在治疗前后无变化，但三者的生长速度不同，下颌骨生长最快，上颌骨较慢，前颅底的生长速度最慢。
[关键词]青少年；双颌前突；拔牙矫治；颅颌面
[中图分类号]R783.5 [文献标识码]A [文章编号]1008-6455(2004)01-0067-02
The study of changes in cranio-facial after orthodontic treatment with premolars extracted in bimaxillary protrusion in adolescents
SONG Wei-hua, LI Dong and DUAN Yin-zhong
(Department of Orthodontics, College of Stomatology, the Fourth Military Medical University, Xi’an，Shaanxi 710032, China)
Abstract: Objective To study the changes in maxilla,mandible and SN after orthodontic treatment with four pre－molars extracted in bimaxillary protrusion in adolescents and provide clinical useful data for predicting curative ef－fect after orthodontic treatment. Methods This study selects 17 bimaxillary protrusion's adolescents and contrast 8 hard-tissue controls before and after orthodontic treatment with Paired t Test to evaluate the changes in maxilla, mandible and SN. Results There are no changes in Y axis angle、N-S-ANS、S-N-ANS、N-S-Gn and S-N-Gn before and after treatment in statistical sense, S-N、S-ANS and S-Gn changed in statistical sense and respective－ly increased 1.89mm, 2.97mm, 5.43mm. Conclusion There are no changes in development directions of maxilla,mandible and SN before and after orthodontic treatment for bimaxillary protrusion抯 adolescents with four premo－lars extracted,but there are different in development rate,the development of mandible is the fastest, maxilla is slower, SN is the slowest.
Key words: adolescent; bimaxillary protrusion; extraction; cranio-facial
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