الفهرس 
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Abstract
Objective: The purpose of this study was to assess the diagnostic accuracy of cone beam computed tomography (CBCT) versus digital bitewing (PSP) in detection of simulated recurrent caries beneath composite restoration. Materials and Methods: In this study, a total of 60 proximal slots of class II cavities were prepared on 60 extracted human premolars and molars. Then, 30 teeth were randomly selected out of this sample and artificial carious lesions were created on these teeth by a round bur (study group). All 60 teeth were restored with composites fillings and radiographs were taken, both with Digital bitewing (PSP system) and CBCT (Cranex 3D) using 5x5mm field of view at three voxel sizes : 0.85,0.125,0.200mm. The area under the receiver operating characteristic curve (AUC) was used to compare the diagnostic accuracy of two systems. The inter- and intra-operator agreement was assessed by kappa analysis (P < 0.05). Results: The AUCs value for CBCT with voxel size 0.85mm,0.125mm, 0.200mm and digital bitewing were 0.983,0.917,0.833.0.600, respectively. Significant differences were found between CBCT and digital bitewing (pairwise comparisons, P < 0.001, < 0.001, = 0.004 respectively. The kappa value for inter-observer agreement was 0.980 and 0.865 for CBCT and digital bitewing, respectively. Conclusion : CBCT has a higher diagnostic accuracy than digital bitewing conventional intraoral radiography for detection of recurrent caries around composites resin restoration. Voxel size 0.125mm can be used to detect caries lesions with adequate accuracy and the least patient exposure dose. CBCTs, taken for other diagnostic reasons, can be used for caries detections.