Objective:To determine the relationship between the rate of anterior teeth root resorption and orthodonc-tic treatment applying microscrew implant anchorage or orthognathia surgery.

• 目的:观察微型种植体作矫正支抗和正颌手术配合矫正治疗后患者上前牙牙根吸收情况,了解牙根吸收率与牙齿移动距离和受力时间的关系。