多层螺旋CT三维重建在上颌埋伏牙诊断中的应用价值

目的:探讨多层螺旋CT三维重建在诊断上颌埋伏牙中的应用价值。方法:45例经口腔全景片确诊但定位模糊的埋伏牙患者,均行16层螺旋CT容积扫描,并通过AW4.3工作站对扫描数据进行容积再现、最大密度投影、多平面重建、曲面重建重组图像。结果:45例中共检查出59颗埋伏牙,其中阻生埋伏牙14颗,多生埋伏牙45颗。结论:多层螺旋CT三维重建能从不同角度观察牙体断面及三维立体图像,从而获得埋伏牙的数量、唇腭侧位置、牙体形态、萌出方向及其与邻牙解剖关系,在埋伏牙微创拔出和正畸治疗中有重要指导意义,值得临床推广使用。

Value of 3-D reconstruction technique of multi-slice spiral CT in the diagnosis of maxillary embedded teeth

Objective:To investigate the clinical value of 3-D reconstruction of multi-slice spiral CT in the diagnosis of maxillary embedded teeth. Methods:The data of 16-slice spiral CT scan of embedded teeth with ambiguous location diagnosed by X-ray orthopantomography in 45 cases were imported into AW4. 3 workstation, the volume rendering, maximum intensity projection, multi-planar reconstruction and curved planar reconstruction of teeth were analyzed. Results:Fifty-nine embedded teeth in 45 cases were found,which included 14 impacted teeth and 45 embedded supernumerary teeth. Conclusions:The profile and 3-D images of teeth can be observed by multi-slice spiral CT 3-D reconstruction technique,which can identify the number of embedded teeth,lip-palatal side position,direction of tooth form,and anatomical relationship with adjacent teeth,have great significance in pulling the embedded teeth and orthodontic treatment,and is worthy of further clinical application.