目的探讨下颌角截骨整形术后咬肌的变化。方法选取我科2009年7月至2015年6月收治的下颌角截骨整形术患者26例,分别在术前、术后10 d、术后1年行颌面部CT三维重建,以测量咬肌最大横截面积;同时进行咀嚼效率测定。结果全部26例患者术后10 d咬肌最大横截面积相比术前明显增加(P<0.05),术后1年最大横截面积相比术前略减小,无显著性差异(P>0.05)。术后10 d咀嚼效率相比术前明显减小(P<0.05),术后1年咀嚼效率相比术后10 d明显增大(P<0.05),和术前没有显著差异(P>0.05)。结论下颌角截骨整形术后1年,患者的咬肌功能基本恢复。

Objective To investigate the changes of masseter muscle after mandibular angle osteotomy.Methods A total of 26 patients were treated with mandibular angle osteotomy from July 2009 to June 2015.Three-dimensional reconstruction by maxillofacial CT was used to measure the maximum cross-sectional area of masseter muscle before operation,10 days and 1 year after operation.Meanwhile,the masticatory efficiency was measured and the variance analysis was performed.Results The maximum cross-sectional area of masseter muscle increased 10 days after operation (P＜0.05).Compared with the pre-operation,the maximum cross-sectional area decreased slightly 1 year after operation,and there was no significant difference between the 2 groups (P＞0.05).The masticatory efficiency decreased significantly 10 days after operation (P＜0.05).Compared with the 10 days post-operation,the masticatory efficiency increased significantly 1 year after operation (P＜0.05).And there was no significant difference of masticatory efficiency between 1 year post-operation and preoperation (P＞0.05).Conclusion The masseter muscle function can be restored 1 year after mandibular angle osteotomy.