Liou J W, Huang C S, Wang F L, Chen Y R
Department of Dentistry and Surgery, Chang Gung Memorial Hospital, Taipei, Taiwan, R.O.C.
Changgeng Yi Xue Za Zhi. 1995 Jun;18(2):147-53.
The present study was undertaken to evaluate the postoperative relapse from the period of unwiring to 1 year postoperatively and its correlation to the amount of mandibular setback and change in vertical dimension after mandibular bilateral sagittal split osteotomy. Twenty-seven patients were evaluated cephalometrically by the time preoperatively, 6 weeks, 6 months and 1 year postoperatively. It was found that 1) the average amount of mandibular setback at pogonion point, 6 weeks postoperatively, is 7.6mm backward and 1.9mm downward, 2) the average amount of horizontal relapse at pogonion point, 6 months and 1 year postoperatively, are 1.9mm and 2.3mm respectively. 86% of the horizontal relapse, 1 year postoperatively, occurs in the first 6 months after removal of intermaxillary fixation, 3) the average amount of vertical relapse at pogonion point, 6 months and 1 year postoperatively, are 0.9mm and 1.1mm upward. 82% of the vertical relapse, 1 year postoperatively, occurs in the first 6 months after removal of intermaxillary fixation, 4) the amount of 1 year postoperatively horizontal relapse is significantly correlated both with the amount of horizontal mandibular set back and vertical downward change (r = 0.58, 0.67, p < 0.001), whereas the amount of vertical relapse is with the vertical downward change only, but horizontal setback isn't.
本研究旨在评估从拆除骨固定线至术后1年期间的术后复发情况，及其与下颌双侧矢状劈开截骨术后下颌后缩量和垂直维度变化的相关性。对27例患者在术前、术后6周、6个月和1年时进行了头影测量评估。结果发现：1）术后6周时，颏点处下颌后缩的平均量为向后7.6mm、向下1.9mm；2）术后6个月和1年时，颏点处水平复发的平均量分别为1.9mm和2.3mm。术后1年水平复发的86%发生在去除颌间固定后的前6个月；3）术后6个月和1年时，颏点处垂直复发的平均量分别为向上0.9mm和1.1mm。术后1年垂直复发的82%发生在去除颌间固定后的前6个月；4）术后1年的水平复发量与下颌水平后缩量和垂直向下变化量均显著相关（r = 0.58，0.67，p < 0.001），而垂直复发量仅与垂直向下变化量相关，与水平后缩量无关。
