RESUMO
Objective:To determine the accuracy of volumetric analysis of teeth in vivo using cone beam computed tomography(CBCT).Methods: The physical volume(Vw) of 24 bicuspids extracted for orthodontic purposes(16 were imaged with the i-CAT and 8 with the CB MercuRay before extraction) was determined using water displacement technique.Corresponding pre-treatment CBCT image data were uploaded into Amira 4.0 for segmentation and radiographic volume(Va).All measurements were performed twice by two observers.The statistical difference between Vw and Va was assessed using a paired t-test.The intra-and inter-observer reliability was determined by calculating Pearson correlation coefficients and intraclass correlation coefficients(ICC).Results: The overall mean Vw of teeth specimens was 0.553?0.082 cm3,while the mean Va was 0.548?0.079 cm3,0.529?0.078 cm3 for observer 1,and 0.567?0.085 cm3 for observer 2.There were statistically significant differences between Va and Vw(P