目的选择不拔牙矫治方法拓展牙间隙,解除拥挤。方法选用超弹螺旋推簧,结合“J”钩口外支抗,对安氏Ⅱ类牙列拥挤,采用不拔牙矫治,远中移动上颌磨牙提供间隙,纠正牙列拥挤。结果所选择病例,矫治后磨牙呈中性关系,前牙拥挤纠正,覆颌覆盖正常。结论超弹螺旋推簧,结合口外J钩支抗,矫治Ⅱ类牙列拥挤效果满意。 The purpose of choosing the method of non-extraction of teeth to expand the tooth space, relieve congestion. Methods The hyperechoic spiral spring was used in combination with the “J” hook external abutment to crowch the Class Ⅱ dentition. The maxillary molar was used to provide the gap and correct the crowding of the dentition. The results of the selected cases, the molar treatment showed a neutral relationship, the front teeth crowded correct covering jaw covering normal. Conclusions Superelastic spiral push spring, combined with J hook support outside the mouth, the treatment of type II dentition crowding effect satisfactory.