支抗是指能抵抗或抵消矫治力的反作用力的结构 ,它可以是牙齿和牙弓、口唇肌肉或颅面骨骼。稳定、有效的支抗是正畸和颌面矫形治疗成功的基础。然而在多数后牙缺失这类病例中 ,常常缺乏足够的支抗。许多学者对种植体支抗进行研究 ,利用种植体良好的稳定性来达到增强支抗的目的 Support refers to the structure that can counteract or counteract the orthodontic force of the orthodontic force. It can be teeth and dental arch, lip or craniofacial skeleton. Stable and effective support is the basis for the success of orthodontic and maxillofacial orthopedic procedures. However, in most cases of loss of posterior teeth, there is often a lack of adequate support. Many scholars study implant anchorage, and use the good stability of the implant to achieve the purpose of enhancing the anchorage