AngleⅡ类2分类错是正畸临床中常见的错畸形之一,由于上前牙内倾常造成上牙列拥挤且限制下颌骨矢状向生长发育,造成侧貌不协调。传统的矫治方法有拔牙矫治和非拔牙矫治(不推上颌磨牙向远中)都有其局限性,拔牙矫治可能造成侧貌凹陷,非拔牙矫治则可能造成侧貌过突。本研究通 Angle Ⅱ Class 2 misdiagnosis is one of the common malocclusion in orthodontic clinic. Due to the over-crowding in the anterior teeth, crowding of the upper dentition and limitation of sagittal growth and development of the mandible, resulting in uncoordinated appearance. The traditional methods of orthodontic treatment and non-extraction treatment (without pushing the maxillary molars to the far) have their limitations, extraction may cause lateral denture depression, non-extracorporeal treatment may result in overshooting. This research pass