替牙期前牙反牙合因影响颌、牙合、面正常生长发育 ,如不及时矫治 ,可使畸形向骨性错牙合发展。以往多采用上颌牙合垫矫治器进行矫治 ,但对于乳牙缺失多、龋坏多的患儿 ,往往固位不良 ,部分患儿因不适不配合 ,这都影响了矫治的进程及疗效。而且活动矫治器对前牙无法控根而存在 Anti-occlusion of the anterior teeth of the molar period affects the jaw, occlusal and facial normal growth and development, if not timely correction, can make the deformity to the development of bony malocclusion. In the past the use of maxillary occlusion pad appliance for orthodontic treatment, but for the loss of deciduous teeth, caries and more children often poor retention, some children because of discomfort do not cooperate, which have affected the course and efficacy of correction. And active appliance can not control the root of the anterior teeth exist