Rubenstein L K, Strauss R A, Isaacson R J, Lindauer S J
Department of Orthodontics, MCV/VCU School of Dentistry, Richmond 23298-0566.
Angle Orthod. 1991 Fall;61(3):167-73; discussion 174. doi: 10.1043/0003-3219(1991)061<0167:WNID>2.0.CO;2.
Surgical mandibular advancement can be used to correct an anteroposterior and/or vertical malocclusion. The procedure of choice is often the bilateral sagittal split osteotomy (BSSO). By varying the amount of presurgical overbite correction, the rotational movement of the distal segment of the osteotomy can be controlled. Consequently, the malocclusion and the resultant vertical and anteroposterior facial form changes are predictably planned to produce both the desired occlusion as well as the optimal esthetic facial result. Opening rotation of the distal segment elongates the lower face height by varying amounts depending on the nature of the rotation. The amount and type of rotation can be determined and quantified by the technique presented in this paper, which is based on a geometric theorem used to determine the kinematic center of rotation of an object. This technique can shorten treatment time and produce more predictable results. The specific applications are: 1) treatment planning for individual patients, 2) uniform analyses of treatments and grouping of treatment types, and 3) development of more accurate computerized treatment planning programs.
外科下颌前徙术可用于矫正前后向和/或垂直向错牙合畸形。常用的手术方法通常是双侧矢状劈开截骨术（BSSO）。通过改变术前覆牙合矫正量，可以控制截骨远端的旋转运动。因此，可以预先规划错牙合畸形以及由此导致的垂直和前后向面部形态变化，以产生理想的咬合以及最佳的面部美学效果。根据旋转的性质，截骨远端的开口旋转会使下面高以不同程度延长。旋转的量和类型可以通过本文介绍的技术来确定和量化，该技术基于一个用于确定物体旋转运动中心的几何定理。该技术可以缩短治疗时间并产生更可预测的结果。具体应用包括：1）个体患者的治疗计划；2）治疗的统一分析和治疗类型分组；3）开发更精确的计算机化治疗计划程序。
