下颌骨部分外板截除术治疗下面部宽大

Reducing oversize-chin by partly mandibular outer plate osteotomy

目的:探讨为治疗下面部宽大而行下颌骨部分外板截骨术的有效截骨范围及其安全性.方法:以下颌第二磨牙后缘下方0.8cm为中心,向下画垂直线到下颌下缘,向后平行咬合平面画线到下颌升支后缘,两线间外板全层截除,垂直截骨线距颏孔0.5cm之间外板部分截除术.截骨缘打磨平整.结果:术后下面部宽度明显缩小,平均缩窄1.0cm,而正常的下颌角角度维持不变,达到了较为理想的求美效果.结论:对下颌角角度正常的下面部宽大患者,此方法安全有效,值得推广.

AIM：To explore effective range and security of partly mandibular outer plate osteotomy for oversize-chin. METHODS：Through the point of below the back edge of mandibular second molar to 0.8 cm,a vertical line down to the lower edge of jaw was drew and a line parallel to occlusal plane was drew to the back edge of the mandibular ramus simultaneously. The full-thickness outer plate between two lines and between the vertical osteotomy line 0.5 cm and the mental foramen were cut-off. Then the osteotomy edge were grinded. RESULTS ： All patients, mandible were significantly reduced after surgery. The average width narrowed for 1.0 cm, while the normal mandibular angle remains unchanged and achieved a more satisfactory result for beauty. CONCLUSION： The partly mandibular outer plate osteotomy is safe and effective to the broad chin patient whose mandibular angle is normal and is worth promoting.