CT三维重建在正畸埋伏牙诊断中的应用

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。

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

OBJECTIVE: To evaluate the 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 treatment.