安氏Ⅱ类1分类错是临床上常见的一类错畸形,发病率为15%～20%,占正畸治疗患者的49%[1]。其临床表现以下颌后缩为主,可见于各个年龄段的人群。对处于生长发育期的安氏Ⅱ类1分类患者,以往多采取双期矫治,即先采用活动式功能矫治器调整矢状关系的不调,再采用固定矫治器精 Class Ⅱ Division 1 malocclusion is a common clinical category of malformations deformity, the incidence rate of 15% to 20%, accounting for 49% of orthodontic patients [1]. The clinical manifestations of the main jaw shrinkage can be seen in all age groups of people. In the growth and development of the Class Ⅱ Division 1 patients with Class Ⅱ, in the past to take more double-phase correction, that is, the use of active functional appliance to adjust the sagittal tone is not adjusted, and then use fixed appliance fine