Observación de la permeabilidad de los túbulos dentinales en el tercio apical y medio posterior a la preparación de los conductos con rc-prep® e irrigación final

Abstract

Introduction: Chelating agents were introduced in endodontics to facilitate the instrumentation of calcified canals. The aim of this study is to observe the permeability and cleaning of the dentinal tubules in the apical and middle third of single-rooted human teeth using the chelating agent Rc-Prep®. Methods: An experimental observational study in vitro was performed evaluating 21 teeth randomized into two groups with 10 teeth each one and a third group with one tooth. Group I: Each canal was instrumented with Rc-Prep® and irrigated with 5.25% NaOCl, distilled water and 17% EDTA. Group II: The same irrigation was used without Rc-Prep®. Control Group: Irrigated with distilled water. All canals were instrumented using the System Wave One® Primary 25/08, longitudinally sectioned and observed under scanning electron microscopy (SEM) at 2000x. Results: Group I presented lot of smear layer, few permeable dentinal tubules and smaller, group II presented moderate smear layer and greater dentinal tubules than group I. Discussion: After rotatory preparation, irrigation with 5,25% NaOCl and 17% EDTA and the use of Rc-Prep® no microphotography was free of smear layer. Conclusions: Teeth prepared with Rc-Prep® present greater amount of smear layer compared to the group without Rc-Prep®, causing insufficient permeability of the dentinal tubules.