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目的 评价螺旋CT对上颌前部埋伏牙定位的应用价值。方法 对 16例疑上颌埋伏牙患者作上颌牙轴位螺旋CT扫描 ,应用螺旋CT的图像处理功能作多层面重建 (Multiplanarreformation ,MPR)和三维重建 (3dimensionalreconstruction ,3D) ,获得单纯牙体的任何平面、任何曲面的断层像。结果 16例患者 ,11例埋伏牙位于腭侧 ,4例埋伏牙位于唇侧 ,1例埋伏牙牙根位于腭侧 ,而牙冠位于唇侧。中切牙 9例 ,侧切牙 1例 ,尖牙 6例。结论 螺旋CT对上颌埋伏牙的定位精确 ,能清晰显示上颌前部埋伏牙的形态、唇侧或腭侧位置、萌出方向及与邻牙关系 ,可作为上颌埋伏牙外科处理和正畸治疗的重要检查手段。
Objective To evaluate the value of helical CT in the localization of impacted teeth in the anterior maxilla. Methods Twenty-six patients with suspected maxillary impacted teeth underwent maxillary axial helical CT scan. The spiral CT was used to perform multiplanar reconstruction (MPR) and three dimensional reconstruction (3D) The tomographic image of any surface. Results In 16 patients, 11 cases of ambushed teeth were located on the palatal side, 4 cases of ambushed teeth were located on the labial side, 1 case of ambushed teeth was located on the palatal side and the crown was on the labial side. 9 cases of incisors, 1 case of lateral incisors and 6 cases of canines. Conclusion Spiral CT can accurately locate the impacted upper teeth and clearly show the morphology, labial or palatal position, eruption direction and the relationship with the adjacent teeth in the anterior maxilla. It can be used as an important treatment for orthodontic treatment of maxillary impacted teeth Check the means.