Cone-Beam Computed Tomography Analysis of Retreatability of Resin and Bio-ceramic Sealer For Root Canal Treatment: An In Vitro Study.

Root canal retreatment (Re-RCT) cases have shortcomings due to the ineffective removal of the root canal filling material, eventually leading to endodontic failure. This study aims to test the comparative efficacy of retreatment files in removing calcium silicate-based sealer and epoxy resin-based sealer. Thirty-two single-rooted teeth were decoronated at 15 mm and bio-mechanical preparation was performed. These samples were divided into two groups based on the sealer used - Angelus Bio-C ceramic sealer (Angelus, Londrina-PR, Brazil) and AH Plus sealer (Dentsply Sirona, North Carolina, US). Obturation was done and all the samples were stored in the incubator according to the respective setting time of the sealer. After this, the samples in each group were subdivided into two groups based on the retreatment files used, i.e., Neoendo (Orikam Healthcare India Pvt. Ltd., Haryana, India) and Dentsply (Dentsply Sirona, North Carolina, US) retreatment files. The specimens were then sectioned vertically into two halves and analyzed by cone-beam computed tomography (CBCT). A one-way ANOVA F test was used for an intragroup comparison, whereas a post hoc Tukey test was used for an intergroup comparison. The Dentsply retreatment files were superior to the Neoendo retreatment files and the Bio-C ceramic sealer was left behind to a greater extent than the AH Plus sealer. Thus, Dentsply retreatment files were more efficient than Neoendo files and the removal of the Bio-C ceramic sealer was more difficult than the AH Plus sealer.