Eficácia dos sistemas Reciproc e Rotate no retratamento endodôntico de caninos: estudo por micro-CT

Abstract

The present study aimed to evaluate the removal of gutta-percha using different endodontic instruments (Reciproc file and VDW Rotate Retreatment file) through micro-computed tomography (micro-CT). Twenty mandibular canines were selected and scanned using micro-CT to assess the initial morphology and volume of the root canals. Subsequently, the canals were instrumented and obturated using gutta-percha and AH Plus endodontic sealer, following the continuous wave technique. The teeth were scanned again and then divided into two groups according to the endodontic retreatment protocol used (n=10): Reciproc and VDW Rotate Retreatment system. After this stage, another micro-CT scan was performed to assess the effectiveness of each system in removing the filling material from the root canals. The quantification of the remaining filling material volume was conducted using the CTAn software. Data normality was verified using the Shapiro-Wilk test, and comparisons between the groups were performed using the Mann-Whitney test (for non-parametric data) or the Student’s t-test for independent samples (for parametric data) (P < 0.05). The results showed that both evaluated systems had similar performance in removing the filling material (13.3% and 12.1%) for the Reciproc and VDW Rotate groups, respectively, with no statistically significant difference between them (P > 0.05). However, neither system was able to completely remove the filling material. It is concluded that the Reciproc and VDW Rotate Retreatment systems provide similar removal of filling material from the root canals of mandibular canines.