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Background and Objectives Internal Root Resorption (IRR) occurs in pulpchamber and canals of the tooth and results in desolation of around dentin. Regarding to important role of early diagnosis of IRR in prognose and treatment plan of the teeth and also limitations of intraoral technics in early detecting of these lesions, in this study we evaluated the accuracy of PSP in diagnosis of these lesions. Subjects and Methods We split 70 single root premolar teeth mesiodistalyand made artificial IRR in 35 teeth. The rest of them used as control group PSP and Conventional radiography captured from all teeth. IRR existence or not was considered in PSP and Conventionalradiographies of each tooth. Results PSP has complete agreement in all cases with reality but Conventional radiography in some cases particularly in 1/3 apical lesions of the root has moderate accuracy with reality and its results diden’t have considerable differences with reality. Conclusion Regarding to this study, has higher accuracy for PSP than Conventional radiography in detecting Internal root resorption lesions particularly in apical sites.

Comparison of Diagnostic Accuracy of Conventional and Photo Stimulable- Phosphor Periapical Radiography in Internal Root Resorption Lesions