Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Oral (Radiology and Diagnosis)

External root resorption is a multi-factorial pathosis which can potentially cause irreversible damage of tooth structure and may even lead to complete loss of the tooth. Early diagnosis of resorptive lesions has a substantial effect on the line of treatment and contributes to preservation of the affected tooth. However, diagnosis of resorptive defects may sometimes be an extremely challenging task. Owing to lack of signs or symptoms and difficult visualization in routine intraoral radiographs, clinical and conventional radiographic examinations are considered unsuitable for this task.(10,102,104) Over the past twenty years, CBCT has already proven its efficiency in detecting multiple dental conditions. Various studies had investigated its diagnostic accuracy in detection of external root resorption and found it to be remarkably superior to other radiographic modalities. The only concern that hinders its extensive use in dental diagnostic tasks is its high radiation dose relative to that of intraoral techniques. Since the selection of an imaging modality that yields a minimal radiation dose with no significant compromise of its diagnostic accuracy is of paramount importance, therefore; this study aimed to assess the diagnostic accuracy of a novel CBCT imaging protocol (Ultra-Low dose) in detection of simulated external root resorption

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