Abstract
The aim of this study was to assess the effect of endodontic chemical substances on the retention of fiber posts luted using a self-adhesive cement. Single-canal human roots of 75 teeth were divided into 5 groups (n = 15). Root canals were instrumented with one of the following substances: 0.9% NaCl (control); 5.25% sodium hypochlorite; 5.25% Sodium hypochlorite + 17% EDTA; 2% chlorhexidine gel; 2% chlorhexidine gel + 17% EDTA. After chemo-mechanical preparation, fiber post cementation was performed with self-adhesive resin cement (RelyX Unicem, 3 M/ESPE). One-way ANOVA was performed followed by a multiple comparison Tukey post hoc test (α = 5%). The use of 2% chlorhexidine gel resulted bond strength statistically similar to the control group (p = 0.418), which was higher than the other groups. A final irrigation with 17% EDTA significantly reduced bond strength (p < 0.001). The use of 5.25% sodium hypochlorite negatively affected the bond strength, either with or without a final irrigation with 17% EDTA (p < 0.001). Our results suggest that 2% chlorhexidine gel used during endodontic chemo-mechanical preparation, without a final irrigation with 17% EDTA, promotes a more favorable condition to the retention of fiber posts luted using a self-adhesive cement than 5.25% sodium hypochlorite.
Highlights
Glass-fiber posts are an important clinical option to provide retention for coronal dental restorations, as they have the elastic modulus is similar to that of dentin, and are cemented by an adhesive technique [1].The debonding at the dentin/cement interface has been considered the major cause of fiber post restorations failure [2,3]
Endodontic protocols indicate the application of 17% Ethylene diamine tetracetic acid (EDTA) as a final irrigating solution, in order to promote an appropriate cleaning of the root canal walls, improving the penetration of chemical substances and promoting a better contact between the dentin walls and filling material [10,11]
The use of NaOCl as a chemical substance resulted in the lowest bond strength (p < 0.001)
Summary
The debonding at the dentin/cement interface has been considered the major cause of fiber post restorations failure [2,3]. A propitious environment for both root dentin hybridization and stability of the bond strength must be intended. One of the factors affecting the bond strength of fiber posts is the chemical substance used for biomechanical preparation of root canals [4]. Endodontic protocols indicate the application of 17% Ethylene diamine tetracetic acid (EDTA) as a final irrigating solution, in order to promote an appropriate cleaning of the root canal walls, improving the penetration of chemical substances and promoting a better contact between the dentin walls and filling material [10,11]
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