Estudo ex vivo na remoção da smear layer com agitação e sem agitação do EDTA 17% e ácido cítrico 10%: análise em MEV

Abstract

The removal of the smear layer favors the penetration of disinfecting agents within the dentinal tubules and promotes better adaptation of endodontic filling materials. The purpose of this study, ex vivo, was to evaluate the smear layer removal with and without agitation EDTA 17% and 10% citric acid. Twenty-five freshly extracted human canines were instrumented and randomly divided into five groups according to the protocol irrigation end: G1 - 5 ml of 10% citric acid per 1 minute without agitation and 5 ml of 6% NaOCl, G2 - acid 10% citric associated with gutta-percha agitation for 1 minute 6% NaOCl +, G3 - 17% EDTA for 1 minute without stirring NaOCl + 6%; G4 - 17% EDTA with agitation associated with gutta-percha + NaOCl for 1 minute 6%; G5 - 10 ml of 6% NaOCl (positive control). The specimens were cleaved longitudinally and prepared for analysis in the apical third Scanning Electron Microscope (MEV). Data were analyzed with the Kruskal-Wallis and Dunn multiple comparison. According to the results of the statistical analysis, comparison between the groups, two by two, there was no difference between Groups III and V, as compared to Group IV. Groups III and V were not able to remove the smear layer. There was no statistically significant difference between Groups I, II and IV. It was concluded that there was no difference between the groups regarding the removal of the smear layer, except the group which used 17% EDTA without agitation, the latter has been unable to remove the smear layer of dentin wall.