上颌埋伏阻生尖牙应用螺旋CT定位诊断的研究

On the localization of impacted maxillary canines by spiral CT

目的:探讨螺旋CT在上颌埋伏阻生尖牙定位诊断中的应用价值。方法:对22例(27颗)上颌埋伏阻生尖牙行轴位螺旋CT容积扫描,利用GEAW 4.1工作站对数据进行图像后处理,以获得任意方向的三维立体图像或任意曲面断层图像。对埋伏牙进行外科-正畸联合治疗。结果:螺旋CT三维重建可以从多个角度清晰地显示出所有埋伏阻生尖牙位置、形态、大小、萌出方向及与周围组织的关系。依据扫描结果制定治疗计划,26颗埋伏阻生尖牙取得了预期的临床效果。结论:螺旋CT三维重建技术弥补了传统X线片的不足,能全方位地展示埋伏尖牙,在上颌埋伏阻生尖牙的定位诊断中具有很高的应用价值。

Objective： To investigate the application value of spiral CT to the locatization diagnosis of impacted maxillary canines.Methods： 27 impacted maxillary canines of 22 patients underwent spiral CT volume scans,and image postprocessing was performed on the GEAW 4.1 workstation to obtain the three dimensional（3-D） images or arbitrary surface tomographic images.Then,the impacted maxillary canines were conducted surgery-orthodontic treatment.Results： The location,shape,size,eruption orientation of the impacted maxillary canines and their relationships with the surrounding tissues can be clearly seen from every angle through the 3-D reconstruction of spiral CT.The therapeutic plan was made according to the scans,and expected clinical effect was achieved for 26 impacted maxillary canines.Conclusion： The 3-D reconstruction technique of spiral CT has made up for the insufficiency of traditional X-ray,through which the impacted maxillary canines can be clearly observed.Therefore,the 3-D reconstruction technique of spiral CT can be of high application value in localization diagnosis of impacted maxillary canines.