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.
2013, Vol. 24 
