所有病例都合并使用了高位的水平截骨颏前徙术以增进手术效果。

We do the chin advancement for all 4 cases to promote the surgical effects.

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目的：探讨下颌升支矢状骨劈开术（SSRO）前徙下颌后，在不同颌周肌肉作用下，下颌升支手术区内的应力分布情况，从理论力学的角度为临床治疗提供依据。

Objective: To study the distribution of stress caused by different mastication muscles in mandibular ramus operative area after sagittal split ramus osteotomy (SSRO), so as to guide the clinical work.

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目的探讨眼睑前层后徙术矫治严重及复发性上睑倒睫的临床疗效。

Objective To evaluate the therapeutic effect of anterior palpebral layer retropulsion for severe or recurrent upper eyelid trichiasis.

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