Abstract:

Severe skeletal malocclusion is not only an existing dental problems，which is associated with upper and lower arch size discrepancy， Morphology，Position，Symmetry and other significant abnormalities，but also it affects the patient's oral cavity，the physiological function of maxillofacial and even the whole body，patient's social status，furthermore it may also cause a different Psychological effects to the patient. The combination of orthodontic treatment and orthognathic surgery can treat severe skeletal malocclusion problems which cannot be treated by orthodontic treatment alone. As a result，the patient can have an ideal improvement by a combination of both therapies in order to maintain healthy aligned teeth，stable occlusal relationship，improved oralfunctionand facial aesthetics. These will improve the patient's life quality，enhance patient′s selfconfidence，as well as a happy life.

Key words: skeletal malocclusion, orthodontic-orthognathic treatment, function changes after orthognathic surgery

摘要：

严重骨性错牙合畸形除了牙性问题，主要表现为上下颌骨大小、形态、位置以及对称性等显著异常，进而影响患者口腔、颌面乃至全身的生理功能，也会对患者的社会心理带来不同程度影响。正畸正颌联合治疗严重骨性错牙合畸形，可最大限度地改善正畸治疗难以解决的骨性问题，在排齐牙齿、维护牙齿健康的同时，又可获得协调而稳定的咬合关系，改善口腔功能和面部美观，提高患者生活质量。

关键词: 骨性错牙合畸形, 正畸正颌联合治疗, 正颌术后功能变化