Abstract
The aim of this study was to evaluate the effect of peracetic acid (PAA) as a single irrigant on the smear layer, on the intraradicular dentinal bond strength, and on the penetrability of an epoxy-based resin sealer into the dentinal tubules. A total of 120 roots were distributed into 4 groups according to the irrigant used in root canal preparation: 1% PAA (PAA); 2.5% NaOCl followed by final irrigation with 17% EDTA and 2.5% NaOCl (NaOCl-EDTA-NaOCl); 2.5% NaOCl (NaOCl); and saline solution (SS). The smear layer was evaluated using scanning electron microscopy. The bond strength of an epoxy-based resin sealer (AH Plus) to root dentin was evaluated by the push-out test and penetrability of the sealer into dentinal tubules was observed by confocal laser microscopy. The results were analyzed by the Kruskal-Wallis and the Dunn post-test (α = 0.05). The use of 1% PAA as single root canal irrigant provided smear layer removal and improved the penetrability and bond strength of AH Plus to root dentin in a manner similar to that of the NaOCl-EDTA-NaOCl group (p > 0.05). The NaOCl and SS groups had higher values of smear layer and lower values of sealer penetrability and dentin bond strength than the PAA and NaOCl-EDTA-NaOCl groups (p < 0.05). Thus, 1% PAA has the potential to be used as a single irrigant in root canals.
Highlights
Submitted: November 19, 2018 Accepted for publication: May 14, 2019 Last revision: June 12, 2019Sodium hypochlorite (NaOCl) is the irrigant solution universally indicated for chemomechanical root canal preparation due to its antimicrobial and organic material solvent actions.[1,2] NaOCl adversely affects the mechanical properties of dentin, such as microhardness, elastic modulus, and flexural and fatigue strength.[3]
The specimens were randomly distributed into 4 groups (n = 30) according to the irrigant used for root canal preparation: 1% peracetic acid (PAA) (PAA); 2.5% NaOCl (Rioquímica, São José do Rio Preto, SP, Brazil) during instrumentation, followed by final irrigation with 17% Ethylenediaminetetraacetic acid (EDTA) (Biodinâmica, Ibiporã, Brazil) and 2.5% NaOCl (NaOCl-EDTA-NaOCl); 2.5% NaOCl (NaOCl); and 0.9% saline solution (JP Indústria Farmacêutica S.A, Riberão Preto, Brazil) as control (SS)
In all the root thirds, there was no statistical difference between the PAA and NaOCl-EDTA-NaOCl groups (p > 0.05) and both these groups presented lower smear layer values than those of the NaOCl and saline groups (p < 0.05)
Summary
Submitted: November 19, 2018 Accepted for publication: May 14, 2019 Last revision: June 12, 2019Sodium hypochlorite (NaOCl) is the irrigant solution universally indicated for chemomechanical root canal preparation due to its antimicrobial and organic material solvent actions.[1,2] NaOCl adversely affects the mechanical properties of dentin, such as microhardness, elastic modulus, and flexural and fatigue strength.[3]. The use of EDTA associated with NaOCl leads to the erosion of dentin and reduction in microhardness.[6]
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