Comparison of periapical radiography, panoramic radiography, and cone-beam computed tomography for detecting implant-related injuries to the inferior alveolar canal: An ex vivo study

Background: The aim of this study was to evaluate the diagnostic potential of periapical radiograph, panoramic radiograph, and cone-beam computed tomography (CBCT) in detecting implant-related perforation of the inferior alveolar canals. Materials and Methods: study, a total of 45 dental implants were placed in 15 sheep hemimandibles simulating two types of injuries to the inferior alveolar canal: pilot drill injury and implant penetration into the canal. Fifteen implants were placed as the control group with 1 mm distance from the inferior alveolar nerve (IAN) canal roof. An imaging phantom was prepared by placing implant-containing blocks in the posterior mandibular area on both sides of an artificial model of the cranium. Panoramic and periapical radiographs as well as CBCT scans were obtained from the imaging phantom. Two independent observers repeated image analysis over two sessions. The area under the receiver operating characteristic curve (AUC) was used to determine diagnostic accuracy. Interobserver and intraobserver agreements were obtained using Cohen's kappa (α = 0.05). Results: > 0.05). Conclusion: CBCT was better in detecting pilot drill injuries to the IAN canal compared to panoramic radiograph. Therefore, in cases where clinical presentations suggest IAN disturbances, CBCT scan should be preferred. However, the diagnostic potential of periapical radiograph, panoramic radiograph, and CBCT was not significantly different for detection of penetrative injuries to the IAN canal.