曲面体层片和螺旋CT三维重建对上颌埋伏中切牙唇腭向定位的对比研究

目的应用曲面体层片(panoramic tomography,PTG)和螺旋CT三维重建(three-dimensional reconstruction of spiral computed tomography,3D CT)对上颌埋伏中切牙(impacted maxillary central incisors,IMCIs)进行唇腭向定位,比较两者的差异,探讨应用PTG对上颌埋伏中切牙进行唇腭向定位的方法。方法对25例上颌埋伏中切牙使用PTG和3D CT成像,3D CT成像包括表面遮盖技术(shaded surface display,SSD)和多平面重建技术(multiplanar reformation,MPR)。在3D CTMPR矢状位图像上测量埋伏中切牙唇腭向的倾斜角度(labial-palatalangle,LPA),综合MPR及SSD图像对埋伏牙冠根唇腭向分布进行评估;在PTG图像上通过反三角函数测算埋伏中切牙的LPA,并对埋伏牙冠根在唇腭向的分布进行评估;对两种成像方法得到的上述结果用SPSS11.5进行统计学分析。结果通过PTG测算的埋伏中切牙的LPA与在3D CT图像上测得的LPA显著相...

Application panoramic tomography and three-dimensional reconstruction of spiral computed tomography to impacted maxillary central incisors for their labial-palatal location

Objective To apply panoramic tomography(PTG) and three-dimensional reconstruction of spiral computed tomography(3D CT) to impacted maxillary central incisors(IMCIs)for their labial-palatal location,and to compare the differences and discuss the method of using PTG to locate IMCIs labial-palatally.Methods Twenty-five cases of IMCIs were examined with both PTG and 3D CT,the 3D CT contained shaded surface display(SSD) and multiplanar reformation(MPR).The labial-palatal angles(LPA) of IMCIs were measured on sag...