锁牙合是后牙的一种错牙合畸形，７－颊向移位，被锁结在７－的颊侧，在临床上较多见。常规矫治时，在锁结牙上做带环，借助橡皮圈进行颌间交互牵引，有时产生支抗牙移位及影响口腔功能等弊端，为此我们使用方丝“口字曲”，取得良好效果。１临床资料１．１一般资料１６例... Occlusal occlusion is a malocclusion of posterior teeth, 7-cheek to shift, was locked in the 7-buccal side, more common in clinical practice. Conventional orthodontics, the lock knot on the ring to do with the rubber band for intermaxillary traction, and sometimes produce tooth displacement and affect the oral function and other shortcomings, for which we use the square wire “Oral song” and achieved good effect. 1 clinical data 1.1 general information 16 cases ...