Baek Seung-Hak, Kim Tae-Kyung, Kim Myung-Jin
Department of Orthodontics, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2006 Feb;101(2):155-63. doi: 10.1016/j.tripleo.2005.04.007. Epub 2005 Sep 21.
This study was performed to compare the condylar position and angulation on 3-dimensional (3D) views between greater setback side (GSS) and lesser setback side (LSS) after asymmetric mandibular setback (AMS) using computed tomography.
The sample consisted of 12 Korean skeletal class III malocclusion patients with mandibular prognathism and facial asymmetry, who underwent sagittal split ramus osteotomy (SSRO) with rigid fixation. Tomographs were taken 1 month before (T1) and 6 months after surgery (T2). Position and angulation of the condyles were measured.
At T1 stage, the condylar head in GSS showed more forward inclination on the sagittal view (P < .05) than that of LSS. Although there were significant inward and backward rotations of the condylar head in GSS (P < .01) and significant backward rotation in LSS at T2 stage (P < .05), 3D positions of the condyle in GSS and LSS were not changed after AMS.
SSRO might be effective to stabilize the condylar position for AMS.
本研究旨在利用计算机断层扫描比较不对称下颌后缩（AMS）术后三维（3D）视图上大后缩侧（GSS）和小后缩侧（LSS）的髁突位置及角度。
样本包括12例患有下颌前突和面部不对称的韩国骨性III类错牙合患者，他们接受了带坚固内固定的矢状劈开下颌支截骨术（SSRO）。在术前1个月（T1）和术后6个月（T2）进行断层扫描。测量髁突的位置和角度。
在T1阶段，GSS侧的髁突头部在矢状面上比LSS侧表现出更向前的倾斜（P < .05）。虽然在T2阶段GSS侧的髁突头部有显著的向内和向后旋转（P < .01），LSS侧有显著的向后旋转（P < .05），但AMS术后GSS和LSS侧髁突的三维位置没有改变。
SSRO可能对稳定AMS的髁突位置有效。
