双侧下颌角突出合并小颏畸形的治疗

目的 提高双侧下颌角突出伴有小颏畸形的手术治疗效果。方法 用口内入路行双侧下颌角连续弧线截骨术，同时行颏部水平骨前徒延长、小夹板坚强内固定、自体下颌角骨质断端间植骨术，不作咬肌部分切除手术。结果 1996－1999年共收治20例，术后下面部宽短畸形明显改善。咬肌虽未行部分切除，但术后随着咬肌附着点的上移、肌张力降低而发生部分萎缩，下颌角部曲线圆滑，形态自然。结论 双侧下颌角突出伴有严重小颏者，只有同时行双侧下颌角有和颏部水平截骨整形，才能达到全面矫治畸形的目的。下颌角连续弧线截骨术截骨设计灵活、向上可达下颌升支后缘、向下可延续至下颌体下缘，截骨量大；一次完成；截央后的下颌角更加圆滑自然；结合颏部截骨整 术，不仅提高了术后的整体效果，而且可利用截除的下颌角骨质充填于颏部水平截骨断端间，可以保证骨质的愈合，一举两得。

Surgical management of bilateral mandibular angle prominence associated with microgenia

OBJECTIVE: A surgical procedure was developed to improve the operative results for bilateral mandibular prominence with microgenia. METHODS: Through an oral approach the bilateral prominent mandibular angles were resected using the technique of continuous curve-line ostectomy with the masseteric muscle intact. Meanwhile, the chin was elongated and moved forward by horizontal osteotomy. The distal part of the chin was rigid fixed with miniplates and screws, and the bone gaps were filled with autogenous bone of the resected mandibular angle. RESULTS: From November 1996 to August 1999, 20 cases of bilateral mandibular angle prominence with microgenia were corrected with this procedure. The postoperative appearance was improved greatly after 3-6 months. The lower face was not only narrowed but elongated, and consequently in harmony with the upper and middle face. CONCLUSION: Bilateral continuous curve-line mandibular angle ostectomy together with chin osteotomy and autogenous bone graft is a good procedure for the management of the above-mentioned deformities.