PURPOSE:To evaluate the effect of two kinds of rigid internal fixation on the structure of the inferior alveolar nerve(IAN)following sagittal split of ramus osteotomy(SSRO)in a rhesus model.

• 目的:对比观察下颌支矢状劈开术(sagittal split ramus osteotomy,SSRO)2种内固定方式术后不同时期下牙槽神经(inferior alveolar nerve,IAN)结构的改变,为临床SSRO手术选择内固定方式提供实验依据。