Influência de diferentes tensoativos em soluções irrigadoras na adesão do cimento endodôntico à dentina radicular bovina

Abstract

The aim of the present study was to evaluate the influence of different surfactants in irrigating solutions on the adhesion of Grossman’s sealer to the root canal walls. Sixty-four bovine roots were sectioned transversally, producing 2 mm height specimens. The root canals of each sample were prepared using a low-speed hand piece and a conical diamond bur. Samples were randomly divided into eight groups (n=8) and root canals were submitted to the following treatments: GI (control) – saline; GII - 2.5% NaOCl; GIII - 2.5% NaOCl + 15% EDTA; GIV - 2.5% NaOCl + 15% EDTAC; GV - 2.5% NaOCl + 15% EDTA-T; GVI - 2.5% NaOCl + MTAD; GVII - 2.5% NaOCl + 4,25% citric acid; GVIII - 2.5% NaOCl + 0.05% Tween 80. After treatment, all samples were filled with Endofill and placed into an incubator at 37ºC and 100% humidity for 48 hours to allow sufficient time for the sealing agent to set. The push-out test was conducted on a Universal Testing Machine Instron 3342, at a constant speed of 1mm/min. The results obtained were in N and then were transformed in MPa. Statistical analysis was performed using one-way ANOVA and Tukey’s test. The statistical analysis revealed significant differences between groups (p<0.05), with the worst adhesion values for GVIII (Tween 80). Among the control group (GI) and the other treatments (GII, GIII, GIV, GV, GVI and GVII) there were no significant differences (p>0.05). It can be concluded that Tween 80 associated to sodium hypochlorite reduces the adhesion of Grossman’s sealer to the root canal walls.