牵张成骨可以增加上下牙弓的长度和牙弓内间隙。对存在牙量骨量不调的患者,当牙量过多时,可进行拔牙及邻面片磨去釉,而当存在骨量不足特别是横向不调时,可通过牵张成骨获得间隙。牵张成骨在北美多用于严重的上下颌骨矢状向不调,北欧多用于常见的Ⅱ类深覆(牙合)患者。作者认为它不能代替传统的正颌外科手术,而只能作为治疗颌骨不调的一种可选择的方法。 Distraction osteogenesis can increase the length of the upper and lower dental arch and dental arch space. For patients who have undetectable amount of bone mass, tooth extraction and surgeries may be used to remove the enamel when there is too much tooth mass, and the gap may be obtained by distraction of the bone when there is insufficient bone mass, particularly lateral misalignment. Distraction osteogenesis in North America is mostly used for severe sagittal sagittal unruly, northern Europe and more for the common type Ⅱ deep overbite (occlusion) patients. The author believes that it can not replace the traditional orthognathic surgery, but only as an alternative treatment of jaw disorders.