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。
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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