坚固内固定技术常被用于双侧升支矢状切开(BS-SO)前移下颌后骨间固定,具有固定效果好,颌间固定时间短、患者易接受等优点,但却有使下颌髁突旋转的高度危险性。本文对此进行了研究。 材料和方法 研究对象为21位连续治疗的BSSO手术以前移下颌者,骨间行螺钉坚固内固定。术前1周和术后8周,在3个轴平面上(x,y,z)摄取CT片,然后应用二维CT重建技术测量髁突位置变化。 结果 术后8周,髁突主要有以下变化:从中线向 Rigid internal fixation is often used in the treatment of bilateral posterior descending sagittal sutures (BS-SO). It has the advantages of good fixation effect, short intercostal fixation time and patient acceptance. However, High risk of mandibular condyle rotation. This article has carried on the research. MATERIALS AND METHODS: Twenty-one consecutive patients undergoing BSSO surgery underwent mandibular advancement, with interosseous screw fixation. One week before surgery and eight weeks after surgery, CT slices were taken on three axial planes (x, y, z), and then the condylar position was measured by two-dimensional CT reconstruction. Results Eight weeks after operation, the condyles mainly had the following changes: from the midline to