【摘要】 目的:研究锥形束CT(CBCT)在诊断上颌埋伏牙冠根成角中的应用。方法:选择在曲面平展片、上牙咬合片上不能确切判断冠根是否成角以及成角大小的上颌埋伏牙患者13例,对其进行CBCT扫描,并进行三维重建,确定埋伏牙在上颌骨中的位置、冠根是否成角,并测量成角度数及冠根长度比。结果:13例上颌埋伏牙中,3例无冠根成角,10例确诊为冠根成角,其中6例冠根成角在120°~150°之间,另外4例冠根成角分别在150°~180°、90°~120°、60°~90°之间不等;7例冠根比在1∶1.5~1∶1之间,5例在1∶1~1∶0.5之间,另1例在1∶2~1∶1.5之间。结论:CBCT能够明确诊断上颌埋伏牙的冠根成角情况,对制定可行的治疗方案具有重要的指导意义。更多还原

【Abstract】 Objective: To evaluate the clinical application of cone beam computed tomography(CBCT) in diagnosing the crown-root angulation of impacted maxillary tooth.Methods: Thirteen patients with maxillary impacted tooth,whose crown-root angle could not be judged by panoramic radiographs and occlusal films,were scanned by CBCT and then the images were taken three-dimensional reconstruction to locate the impacted tooth,detect the presence of crown-root angulation,measure the crown-root angle and ratio.Then the results of measurement were analyzed and discussed.Results: Among the 13 maxillary impacted tooth cases,10 were diagnosed as crown-root angulation,of whom the angles of 6 cases were between 120°~150°,those in 4 cases were between 150°~180°,90°~120°,60°~90° respectively;besides,the crown-root ratio was between 1∶1.5~1∶1 in 7 cases,1∶1~1∶0.5 in 5 cases and 1∶2~1∶1.5 in 1 case.Conclusion: CBCT can definitely diagnose the crown-root angle of impacted maxillary tooth,which provides important clinical significance for making treatment plans.更多还原