Objective to study the feasibility of Combined mandibular Angle resection with angle-splitting performed one-time to reduce the width of lower face.
目的：探讨下颌角截除与下颌骨外板切除术一次成形的可行性。
This article given the accurate description of reverse splitting angle of the Rochan prism in detail, and compared to the forward splitting angle;
给出了洛匈棱镜反向应用时的分束角的精确表达式，并与正向应用时的分束角作了比较；
The propagating directions of the two splitting beams remain unchanged when the incident Angle varies in a certain range.
当入射角在一定范围内变化时，两束分开的光束的传播方向保持不变。
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