双侧升支矢状劈开截骨术后软硬组织移位比例关系研究

目的：探讨双侧升支矢状劈开截骨术(BSSRO)术后软硬组织移位的比例关系，为临床工作提供参考资料。方法：单纯BSSRO水平后退下颌的患者33例，于手术前一周(T1)、术后6个月或6个月以上(T2)分别拍摄头颅定位侧位片。测量软硬组织移位的比例关系并加以相关分析。结果：软组织Li点和Mes点上的移位比例关系与国外文献报告显著不同，各软组织标志点与硬组织B点和Pg点之间的相关性最强。结论：BSSRO术后软硬组织移位比例关系在下唇及颏部与国外结果相差较大，存在人种差异。进行软组织侧貌预测时不能照搬别人的结果，要根据人种及侧面外形的不同来分析。另外，在临床进行软组织侧貌预测时，以B点及Pg点的位移改变来分析相应的软组织标志点的变化最有意义。

Proportion relation of soft and hard tissue movement after bilateral sagittal split ramus osteotomy

Objective To observe the soft and hard tissue movement ratios after bilateral sagittal split ramus osteotomy (BSSRO) and retropositioning of mandible and give the reference to clinic. Methods BSSRO was performed in 33 cases to setback the mandible. The patients were examined with lateral cephalometric radiographs one week before and six months or more after surgery. Results The ratios in soft tissue points Li and Mes are different to other articles. There is correlation between soft and hard tissue only in points B and Pg. Conclusion The ratios of soft to hard tissue are difference in ethnic. When to predict the soft tissue profile, the hard tissue points B and Pg have more significance.