Effect of bioactive dentin modulators on adhesion of glass fiber posts

This study aimed to evaluate the effect of natural dentin modulators on the bond strength and adhesive interface of resin materials bonded to dentin oxidized by sodium hypochlorite. Forty bovine roots underwent endodontic treatment and were assigned to four groups: control gel, Libidibia ferrea 10% gel, Apis mellifera 10% gel, and sodium hypochlorite irrigation. Glass fiber posts were cemented using a universal adhesive system and dual-cure resin cement. Bond strength was assessed by the push-out test, and the failure pattern and resin tag penetration were also evaluated. The results showed that both L. ferrea and A. mellifera treatments enhanced bond strength and resin tag extension compared to the control and sodium hypochlorite groups, with no difference between the two natural modulators, regardless of the root canal third. Cohesive failures were more frequent in the natural modulator groups, whereas adhesive failures predominated in the control and sodium hypochlorite groups. The findings indicate that natural dentin modulators improved the adhesive performance of resin materials bonded to dentin previously oxidized by sodium hypochlorite.