Roh Young-Chea, Shin Sang-Hun, Kim Seong-Sik, Sandor George K, Kim Yong-Deok
Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University, Yangsan, South Korea.
Department of Orthodontics, School of Dentistry, Pusan National University, Yangsan, South Korea.
J Craniomaxillofac Surg. 2014 Dec;42(8):1958-63. doi: 10.1016/j.jcms.2014.08.008. Epub 2014 Sep 7.
To investigate postoperative intersegmental displacement and relapse following bilateral sagittal split ramus osteotomy (BSSRO) by comparing three different fixation methods: group A (sliding plate), group B (miniplate) and group C (bicortical screws).
The present retrospective study included 55 patients with mandibular prognathism who were treated with BSSRO. To evaluate skeletal changes, cone-beam computed tomography was taken before surgery (T0), three days after surgery (T1), and 6 months after surgery (T2). Differences among the three groups were assessed using a one-way analysis of variance, where P < 0.05 was accepted as statistically significant.
There were no significant differences among the three groups in demographic data and the amount of mandibular setback. In skeletal changes and condylar axis changes, there were no statistically significant differences among the three groups. However, there were statistically significant postoperative skeletal changes in group C (bicortical screws) at all landmarks. The mean horizontal relapse rate was 1.9% in group A (sliding plate); 4.8% in group B (miniplate); and 15.4% in group C (bicortical screws).
The sliding plate system has good adaptability to the proximal segment after mandibular setback with BSSRO, and behaves according to semi-rigid fixation principles.
通过比较三种不同的固定方法：A组（滑动钢板）、B组（微型钢板）和C组（双皮质螺钉），研究双侧矢状劈开下颌支截骨术（BSSRO）术后节段间移位和复发情况。
本回顾性研究纳入了55例接受BSSRO治疗的下颌前突患者。为评估骨骼变化，在术前（T0）、术后3天（T1）和术后6个月（T2）进行锥形束计算机断层扫描。采用单因素方差分析评估三组之间的差异，P < 0.05被认为具有统计学意义。
三组在人口统计学数据和下颌后缩量方面无显著差异。在骨骼变化和髁突轴变化方面，三组之间无统计学显著差异。然而，C组（双皮质螺钉）在所有标志点均有统计学显著的术后骨骼变化。A组（滑动钢板）的平均水平复发率为1.9%；B组（微型钢板）为4.8%；C组（双皮质螺钉）为15.4%。
滑动钢板系统对BSSRO下颌后缩后的近端节段具有良好的适应性，并按照半刚性固定原则发挥作用。
