多层螺旋CT在上颌埋伏多生牙的临床应用

目的探讨多层螺旋CT在颌骨埋伏多生牙诊断和定位中的应用价值。方法对43例经临床筛选的埋伏多生牙患者行多层螺旋CT扫描,采用表面遮挡法、最大密度成像及多平面重建技术,显示埋伏牙形态及位置,确定手术路径及方式,并做手术后回顾性分析。结果多层螺旋CT能清晰显示颌部埋伏多生牙的形态、唇腭侧位置及与邻牙关系。43例共52颗颌部埋伏多生牙术前诊断与术中判断完全一致,符合率100%,术后所有患者伤口均Ⅰ期愈合,无感染、邻牙损伤等并发症发生。结论多层螺旋CT能正确判断多生牙,可作为外科处理和正畸治疗的重要检查手段。

MSCT Application of Embedded Supernumerary Teeth in Maxilla

Objective To discuss the applied value of multislice spiral CT(MSCT) in diagnosing and localizing the embedded supernumerary teeth. Methods A total of 43 cases with the embedded supernumerary teeth were undergone MSCT using shaded surface display(SSD), minimum intensity projection(MIP) and multiplanar reformation(MPR) to present the form and location of the embedded supernumerary teeth and to determine the surgical style.The result of image was retrospectively analysed after operation.Results The reconstruction images,could clearly show the dental surface image including crown, root, neck and root bifurcation, labial or palatal location, eruption orientation and relation with dentition in anterior maxilla. The position of 52 embedded supernumerary teeth in 43 patients were completely confirmed by surgery with accuracy of 100%. All patients were well healed with no infection and injury to nearby teeth. Conclusion The Embedded supernumerary teeth in bone can be detected by MSCT and MSCT can be used as an important examination technique before surgical and orthodontic treatment.