CT三维重建在正畸埋伏牙诊断中的应用

Clinical Use of Three-dimensional Surface Reconstruction of Spiral CT for Impacted Teeth in Orthodontics

目的评价CT三维重建在正畸埋伏牙中的诊断价值。方法对常规口腔全景片和咬合片均不能清楚地判断埋伏牙(或阻生牙)形态、位置及与邻牙关系的20例患者,应用螺旋CT进行扫描和图像三维重建,并采用表面遮盖显示法(SSD)显示埋伏牙的形态、位置及与邻牙的关系。结果经CT三维重建和SSD处理后,20例病例均清楚地显示了埋伏牙的牙体形态、唇腭向位置、萌出方向以及与邻牙的关系。结论CT三维重建是一种准确有效的检查埋伏牙的方法。

Objective To evaluate file value of three-dimensional surface reconstruction of spiral CT-shaded surface display （SSD） to examine the impacted teeth before orthodontic treatment. Methods Three-dimensional surface reconstruction of spiral CT and shaded surface display（SSD） was applied to twenty patients whose impacted teeth couldn＇t be judged clearly through the panorama and occlusal films. Results Three-dimensional surface reconstruction of spiral CT and SSD could clearly demonstrate the dental surface image including crown, root neck and root bifurcation in three-dimensional way, labial or palatal location, eruption orientation and relation with dentition. Conclusion It is concluded that the three-dimensional surface reconstruction is an accurate and effective method to examine impacted teeth before orthodontic treannent.