Background:-The aim of this prospective cross sectional study was to determine the accuracy of CBCT in quantifying intra-osseous periodontal bone defects.Methods:-5 patients with intra-bony defects were selected and 10 defects were assessed. A total of 60 measurements were performed.Periapical radiographs and Cone beam CT scan images were obtained. Height and depth of each defects was measured using appropriate software. Direct measurements were done during surgical interventions using a periodontal probe and were considered the standard reference. Measurements made by all three modalities were compared to each other.
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