上颌窦位于上颌骨内,与牙根关系密切~[1],在口腔内科、种植科及牙槽外科等的治疗和操作中都十分关注上颌后牙与上颌窦的关系,以免造成上颌窦穿孔或者将感染扩散至上颌窦,所以,一直以来学者们对于上颌窦与上颌后牙解剖关系的研究焦点更多的是在其对口腔内科、外科以及种植科的诊疗的影响上,关于其对正畸治疗影响的研究比较少~[2]。在正畸治疗中,很多时候需要后牙的适度移动来调整咬合关系及改善面型,在这些病例中,会有上颌 Maxillary sinus is located in the maxillary and closely related to the root [1], in oral medicine, implantology and alveolar surgery treatment and operation are very concerned about the maxillary posterior teeth and maxillary sinus relationship, so as not to cause the maxillary sinus perforation or The infection spread to the maxillary sinus, so, scholars have always been on the maxillary sinus and maxillary posterior anatomy of the anatomy of the more focused on its role in the oral medicine, surgery and implantology diagnosis and treatment on its orthodontic The impact of treatment is relatively small ~ [2]. In orthodontic treatment, there is often a need for moderate movement of the posterior teeth to adjust the occlusal relationship and improve the face shape. In these cases, there will be maxillary