多数牙正锁牙合临床矫治

锁牙合是指上后牙舌尖的舌斜面与下后牙颊尖的颊斜面相咬合，或上后牙颊尖的颊斜面与下后牙舌尖的舌斜面相咬合，咬合面无接触，以正锁牙合更为多见。锁牙合主要表现在牙弓后段，早期不影响美观，常常不易被家长或患者本人发现。而多数牙正锁牙合所表现的牙齿颊舌向、垂直向及近远中方向的异常，易引起颞下颌关节异常、咬合平面偏斜以及颜面部不对称等。多数牙正锁牙合侧咀嚼功能较非锁牙合侧低，且这种错牙合畸形并不能随生长发育自行调整和改善，久而久之会增加骨性畸形程度和正畸治疗难度。多数牙正锁牙合早期通过简单装置将牙齿移动到正确的位置，可建立良好的咬合诱导，建立口周肌肉平衡，以诱导下颌的正常生理功能，避免骨性错牙合畸形的发生发展，建立和维持良好的口颌功能与健康。

Orthodontic treatment of multi-tooth scissor crossbite

Abstract：Scissor crossbite refers to an irregular occlusion，in which the mandibular molar cusps are telescoped within the lingual side of the maxillary molars or the other way around，so that there is no intercuspation of the maxillary and mandibular molars. Generally the former occlusion is more common. As it does not affect aesthetics，both patients and their parents or guardians may be unaware of the malocclusion. Sagittal，vertial and transversal dimensions of the maxilla and mandible altered in multi-tooth scissor crossbite patients，resulting in TMD，facial asymmetry，divergence of the occlusal plane and other malocclusion. Chewing function is also affected in the crossbite side. In subsequent craniofacial development，malocclusion would not be improved leading to a more complicated treatment sequence. Early intervention moves teeth by simple appliances，through which occlusion guidance and muscle balance keep the mandible function well，avoiding the aggravation of malocclusion and deformity.