目的 探讨锥形束CT(CBCT)三维重建技术用于分析阻生下颌第三磨牙的应用.方法 对下颌阻生第三磨牙的136例(236颗牙)患者CBCT影像资料利用NNT图像分析软件通过容积再现、多层面重建和曲面重建等技术对第三磨牙阻生情况进行分类统计.结果 236颗阻生下颌第三磨牙:高位垂直阻生最多(102颗),占43.22％,颊向阻生最少(1颗)；15.68％与下颌神经管接触；与邻牙间隙＞0、=0和＜0分别为115、75和46颗；26.69％邻牙有龋坏；42.80％造成邻牙远中牙槽骨吸收.结论 CBCT扫描技术和分析软件的应用可提供下颌阻生第三磨牙位置的准确数据,为拔除手术方案的制定提供客观依据.%Objective To investigate the application of cone-beam CT (CBCT) three-dimensional reconstruction techniques for analyzing impacted mandibular third molars. Methods A retrospective study was applied and 236 impacted mandibular third molars of 136 patients were included. CBCT image data were analyzed with NNT software by volume rendering, tnultiplanar reformation and curved planar reformation techniques. Results Among the 236 impacted mandibular third molars: vertical impaetion was the most (109) .accounting for 46.19% ,while buccal impaetion was the least (1); 15.68% of them had no bone tissues between the roots and the mandibular canals; Numbersof the teeth whose distance with adjacent teeth > 0, = 0 and <0 were 115,75 and 46 respectively; 26 69% of their adjacent teeth were with caries; 42. 80% of them resulted in distal alveolar bone absorption of adjacent teeth. Conclusions The application of CBCT scanning and analysis software can provide accurate data about position of impacted mandibular third molars and their relationship with adjacent tissues. Objective basis can be provided for surgical planning for the tooth extraction.
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