Microtomographic view of external root resorption: an observational transversal study

This study investigated root resorption (RR), which can occur on the internal or external surfaces of the tooth, with difficulty in differential diagnosis using conventional radiography. Objective: To analyze external root resorption (ERR) through microtomography of ex vivo teeth. Material and methods: Two null hypotheses were tested: (1) the size and shape of natural root resorption are identical to those produced artificially; (2) the size and shape of natural root resorption differ from those produced artificially. Results: 126 teeth were scanned in high resolution, evaluated by calibrated radiologists, showing a higher incidence of RR in premolars (29.8%), followed by molars (27.7%), canines (23.4%), and incisors (19.1%), in relation to root thirds and location on the tooth surface. Conclusion: It was concluded that RR cavities exhibit a distinct architecture compared to those created by round burs, as observed in imaging modalities such as X-rays and cone beam computed tomography.