上颌横向发育不足是临床常见的错牙合畸形,临床表现为儿童或成人患者牙弓狭窄、牙列拥挤、牙弓后段反牙合等。对于在青春发育高峰期之前,腭中缝尚未闭合的患者,可通过上颌扩弓取得较好的临床效果。但在临床工作中,较多的成人患者也存在上颌横向发育不足的问题,据报道,上颌横向发育不足在成人中的发病率达到了10%[1,2],但是成年患者由于上颌的骨缝已经融合,使用传统的扩弓方法主要是通过支抗牙起作用,很难有效的打开上颌腭 Orthodontic maxillary hypoplasia is a common clinical malocclusion deformity, clinical manifestations of children or adults with dental arch stenosis, dentition crowded, dental arch anti-occlusion and so on. For the peak in the puberty, palatal suture has not yet closed in patients with maxillary expansion achieved better clinical results. However, in clinical practice, more adult patients also suffer from lateral hypoplasia of the maxilla. It has been reported that the incidence of maxillary hypoplasia in adults reaches 10% in adults [1,2], but in adult patients, maxillary bone Seams have been fusion, the use of the traditional method of expansion is mainly through the role of support teeth, it is difficult to effectively open the maxillary palate