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Background and purpose: The use of intraoral direct digital radiography has been possible only the past two decades. Controlled laboratory and clinical studies are needed to determine whether the new digital system changes the diagnosis, treatment and prognosis than the conventional methods. Purpose of this study is compare the diagnostic accuracy for the detection of approximal caries of three CCD-based digital systems. Materials and methods: seventy eight surfaces in thirty nine extract unrestored posterior teeth were radiographed under standard condition using three CCD systems, Planmecadixi 2 image receptor with Dimaxis 2.4.1 (Helsinki, Finland) software, Progeny dental image receptor with Cygnus media 3.0 (USA) software and RVGai Trophy image receptor with Trophy windows access (Eastman Kodak, France). The images were assessed by three observers. True caries existence and depth determined by histological examination. Diagnostic accuracy of the systems was validated by using Kappa agreement coefficient. Results: for approximal carries, no significant differences were found in diagnostic accuracy between three CCD systems Conclusion: the diagnostic accuracy of digital CCD systems is comparable with each other. The existence and depth of the lesion had no significant effect on the performance of the imaging modality. Planmeca performed consistently better than others and Progeny performed consistently better than Trophy, but the differences were not significant.

Keywords: Interproximal caries, Radiography, Digital, Kappa agreement coefficient

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