开畸形是临床治疗错畸形中的疑难类型之一,可发生于前牙区、后牙区,或前牙区和后牙区同时存在,其中单纯发生于后牙区较少见,多由局部牙槽骨发育不足所致。主要表现为牙垂直向咬合关系异常[1],对患者咀嚼、吞咽、语言、呼吸及颜面外观等影响较大。由于开形成原因复杂,因此在诊断、矫治时机及方法的选择上难度较大,尤其矫治方法的选择是正畸医师获得理想而稳定矫治效果需面临的重要挑战。 Deformity is one of the difficult types of clinical treatment of malformations, which can occur in anterior teeth, posterior teeth, anterior teeth and posterior teeth, which occur only in the posterior teeth area is rare, mostly by the local Alveolar bone caused by lack of development. Mainly for the vertical occlusion of the tooth abnormalities [1], chewing, swallowing, language, breathing and facial appearance and so on. Due to the complexity of open reason, it is more difficult to choose the diagnosis and treatment time and method, especially the choice of orthodontic treatment is an important challenge for orthodontic physicians to obtain ideal and stable treatment effect.