患者，女性，22岁，上颌双侧缺牙来诊求治。正面观直面型，口内15、25未见，X线检查显示双侧上颌窦过度气化至牙槽嵴顶处，缺牙间隙处牙槽骨菲薄。矫治方案为减数35、45正畸治疗，试关闭15、25缺牙间隙。直丝弓固定矫治器排齐整平上下牙列后，通过持续轻力实现后牙穿上颌窦移动关闭缺牙间隙。疗程25个月，治疗结束后患者咬合关系良好，牙根平行无明显吸收，牙髓活力良好。

The female patient was 22 years old at the time of initial diagnosis, complaining of maxillary bilateral missing teeth. The face was straight type, and the 15, 25 were missing. X-ray analysis showed the bilateral maxillary sinuses were over gasified to the alveolar crest, and the alveolar bone at 15, 25 were extremely thin. The treatment plan of this case was to extract 35 and 45, and attempted to close the space between the missing teeth. Straight wire fixed appliance was used to align the upper and lower teeth, then the space closure through the maxillary sinuses was achieved by continuous light force. The treatment lasted 25 months. After treatment, the occlusion relationship was normal. The radix dentis were parallel without obvious absorption, and the dental pulp vitality was normal.