Materials and Methods:20 patients with 25 un-erupted and impacted teeth were scanned by Spiral CT and processed by dental reconstruction with SIEMENS spiral CT scanner.
材料和方法：用Siemens螺旋CT扫描机，对20例共25颗上颌埋伏阻生前牙患者进行螺旋CT横断面扫描，并进行曲面、三维重建。
The teeth on bevel gears can be straight, spiral or hypoid.
锥齿轮的齿可以是直齿、螺旋形或准双曲面。
Objective: To discuss the Clinical application of spiral ct scanning and 3d imaging reconstruction in the localization of unerupted maxillary teeth.
前言：目的：探讨螺旋CT三维重建技术在埋伏牙定位中的应用价值。
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