目的分析CT三维重建技术在正 畸埋伏牙诊治中的应用。方法 回顾性分 析口腔科自2014年1月-2017年8月收治的 76例牙齿畸形患者的CT影像学资料，均 有完整CT平扫及三维重建影像资料，探 析CT三维重建技术在正畸埋伏牙诊治中的 应用价值。结果 76例患者经CT三维重建 共计检出84颗埋伏牙，59颗来自上颌，25 颗来自下颌，76例为单牙埋伏阻生，4例 双牙，2例为三牙，53颗为埋伏阻生牙， 31颗为埋伏多生牙； 84颗埋伏牙中，尖 牙占比高达48.81%(41/84)，其次为多生 牙(19.02%)，中切牙占比11.90%；其中 76.19%为舌腭侧埋伏，10.71%为唇颊侧埋 伏；75.00%近中埋伏，16.67%远中埋伏， 仅有16.07%的毗邻牙齿牙根有吸收现象； 84颗埋伏牙中46颗无保留价值，经CT三维 重建图像引导，局麻后行拔除手术，均完 整拔除埋伏牙，去骨量小，亦未损伤毗邻 组织；其余38颗埋伏牙给予正畸牵引，牵 引成功率为92.10%。结论 CT三维重建技 术在正畸埋伏牙诊治中均能发挥重要应用 价值。

Objective To analyze the application of CT three-dimensional reconstruction in the diagnosis and treatment of orthodontic embedded teeth. Methods The CT imaging data of 76 patients with dental malformations treated in the department of stomatology from January 2014 to August 2017 were analyzed retrospectively. All the patients had complete CT plain scan and three-dimensional reconstruction data. The application value of CT three-dimensional reconstruction in the diagnosis and treatment of orthodontic embedded teeth was discussed. Results There were a total of 84 embedded teeth in the 76 patients detected by CT three-dimensional reconstruction, including 59 teeth from the upper jaw and 25 teeth from the lower jaw. There were 76 cases of embedded and impacted single tooth, 4 cases of two teeth and 2 cases of three teeth. 53 teeth were impacted teeth and 31 teeth were embedded supernumerary teeth.Of the 84 embedded teeth, the ratio of canine was 48.81% (41/84), followed by supernumerary teeth (19.02%), and central incisors accounted for 11.90%.Among them, 76.19% were embedded on the tongue and palate side, 10.71% were embedded on the labial buccal side, 75.00% were nearly or moderately embedded, 16.67% were far and moderately embedded. There was presence of absorption of adjacent teeth roots only in 16.07% of all teeth.Of the 84 impacted teeth, there were 46 teeth without reserve value. They were removed under local anesthesia under the guidance of three dimensional reconstruction, and all of them were completely removed, with little bone loss and no damage to adjacent tissues.The remaining 38 embedded teeth were treated by orthodontic traction, and the success rate of traction was 92.10%. Conclusion CT three-dimensional reconstruction technique play an important role in the diagnosis and treatment of orthodontic embedded teeth.