Methods: 5 New Zealand rabbits were fixed distractors when they underwent unilateral mandibularosteotomy.
方法：新西兰白兔5只，单侧下颌骨截开。
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Conclusion Mandibular width after bilateral sagittal split ramus osteotomy is a little bigger than before surgery, but this change has little influence on face.
结论①下颌骨宽度在双侧下颌升支矢状劈开截骨术后较术前有轻微增大，但对容貌没有大的影响。
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Objective To measure the mandibular thickness relative to the osteotomy line of mandibular angle plasty so that to provide the anatomical basis for operation.