上颌前部埋伏牙在口腔正畸中经常遇到 ,矫治前确定其牙冠及牙根的位置 ,萌出方向以及与邻牙的结构关系尤为重要。三维ＣＴ重建图像立体感强 ,解剖关系清晰 ,有利于空间定位 ,由此判断埋伏牙能否保留或矫至正常位置[1,2 ] 。为了总结经验 ,现将我院 1997年 7月～ 1999年 12月收 Anterior teeth of maxillary anterior teeth are often encountered in orthodontics. It is particularly important to determine the position of crown and root before erection, the direction of eruption and the structure of the adjacent teeth. Three-dimensional reconstruction of CT images strong sense of three-dimensional, anatomical relationship is clear, is conducive to the positioning of the space, to determine whether the retained teeth can be retained or corrected to normal position [1,2]. In order to sum up experience, now our hospital in July 1997 ~ December 1999 received