Biodentine no reparo de furcas: análise de superfície e interface do efeito de diferentes protocolos de irrigação

Abstract

Due to its short setting time, Biodentine permits endodontists to perform the root canal treatment in the same visit of the furcal repair. The aim of this study was to evaluate the use of Biodentine in furcal repair through surface and interface analyzes, evaluating the effect of different irrigation protocols, associated to the use of NaOCl and different acids / chelating agents on the push-out bond strength and morphology of Biodentine. Furcal perforations with diameter of 1.5 mm were produced in 60 permanent mandibular molars. The walls of the perforated area were contaminated with blood. Biodentine was used for the perforations sealing, which was manipulated according to the manufacturer's recommendations. The perforations were sealed. After 10 minutes, the setting time, the samples were topographically evaluated by scanning electron microscopy (SEM). The samples were then divided into 6 groups according to the irrigation regime. In control group, all irrigation procedure was performed using distilled water. In the others 5 groups, 5.25% NaOCl was used as initial irrigant followed by distilled water in DW group; 17% EDTA in EDTA group; 37% phosphoric acid in PA group; 10% citric acid in CA group; and 7% maleic acid in MA group. Once more, after the irrigation regimens, the teeth were evaluated by SEM. The photomicrographs were evaluated comparatively, in relation to the presence of alterations before and after the irrigation regimes using a score system. Push-out bond strength (POBS) test was performed 7 days after sample preparation and data were statistically analyzed using Kruskal-Wallis and Dunn tests (p < 0.05). All irrigation regimens modified the topography of Biodentine. The effects of irrigation protocols on Biodentine surface led to changes in the interface of this material with dentin. The regimens that used DW and EDTA as final irrigant showed bond strength values statistically lower than the other groups. Control PA, CA, and MA groups did not differ statistically. In conclusion, all irrigation regimens modified the topography of Biodentine. Irrigation protocols, using NaOCl and NaOCl associated with EDTA, led to a reduction in bond strength values from Biodentine to dentin.