1957年Obwegeser's 介绍的下颌升支矢状劈开术现已广泛应用于临床,虽然该术式不断改进,但直到目前,仍未得到一种十分有效的方法避免术后下唇麻木和其它并发症。作者介绍了一种新改良的矢状劈开术,已成功地应用于14例患者。方法术前CT 扫描检查升支骨皮质和骨髓腔厚度,获知升支颊侧骨板内侧至下颌管的距离.以靠近舌侧下颌孔的CT 片预测骨切开平面。有些病例,该处缺少骨髓腔,应用来复锯作骨切开时应予注意。作常规切口和分离,充分暴露升支。以裂钻部分去除升支前 Obwegeser's introduction of the mandibular ascending branch sagittal split in 1957 has been widely used in clinical practice, although the continuous improvement of the procedure, but so far, still not been a very effective way to avoid postoperative lower lip numbness and other complications . The authors describe a new and improved sagittal split technique that has been successfully applied to 14 patients. Methods The distance between the medial side of the buccal plate and the mandibular canal was ascertained by CT scan of the ascending cortical and medullary cavity, and the plane of the incision was predicted by CT slices near the lingual mandibular foramen. In some cases, there is a lack of medullary cavity, which should be noted for multiple sawing. Routine incision and separation, fully exposed ascending branch. To split part of the split before lifting the branch