Background and Objectives: This study was conducted to investigate the accuracy of CBCT by comparing the linear measurements of impacted maxillary canines measured by CBCT scans with physical measurements from digital calipers. Method: 18 patients in the age group of 13 years and above having impacted maxillary canine/s classified as sector III or IVwith complete root formation and willing for surgical extractionwere included. CBCT scan was taken of the quadrant of interest using KODAK 9000 3D Extraoral Imaging System. All linear measurements (mesiodistal width, labiolingual width and total length of tooth) were carried out. After the atraumatic surgical removal of impacted canines, the teeth were collected and the same measurements were made by digital calipers, using the same points as those used for the CBCT scans. The data obtained were subjected to statistical analysis. Results: Intra and inter observer reliability was excellent as coefficient of correlation was above 0.92 for all digital caliper and CBCT measurements. Comparison of intra-examiner CBCT and Digital Caliper methods in measurements of labiolingual width, mesiodistal width and total tooth length by Paired-t test showed no statistically significant difference for labiolingual width and mesiodistal. Conclusion: The labiolingual and mesiodistal tooth width measurements from CBCT scans were accurate and the differences between the digital caliper and CBCT measurements were not statistically significant. Total tooth length measurements derived from the CBCT images were less accurate compared with the actual measurements.

Objective The diagnosis of any dental pathology can vary from being simple to challenging. While the use of cone beam computed tomography (CBCT) is well established, magnetic resonance imaging (MRI) remains a proof of concept. This systematic review aims to compare the diagnostic ability of MRI with CBCT in diagnosing periapical pathosis. Materials and Methods This systematic search was performed using the electronic databases of MEDLINE, Cochrane Library, Google Scholar, and Science Direct to identify relevant articles from 2010 to 2020. The search terms used were magnetic resonance imaging, cone beam computed tomography, diagnosis, and periapical diseases. Result In total, 3218 potentially relevant abstracts and titles were identified. After removing duplicates, 1288 articles were reviewed for titles and abstracts, and 29 articles were selected for full-text reading. From those, 19 articles were finally selected that included original research studies, case reports, and case series and were included for systematic review. Most of the studies included in this review suggested that the combined use of CBCT and MRI is needed for a better and more precise diagnosis of complex periapical pathoses. The main advantage of MRI is its ability to image soft tissues usingnonionizing radiation, and the main disadvantage in the case of CBCT is overdiagnosis of the lesion. Conclusion MRI has various advantages over CBCT with similar diagnostic utility. When diagnosing periapical pathogens, both MRI and CBCT are needed for an accurate diagnosis.