Effect of peracetic acid used as single irrigant on the smear layer, adhesion, and penetrability of AH Plus

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.

Final Endodontic Irrigation with 2% Peracetic Acid: Antimicrobial Activity and Cytotoxicity

“…29 About endodontic irrigating solutions, the cytotoxic effect of chemical auxiliary solutions has been increasingly studied. 29,31,32 This study showed that in the various dilutions, the cell viability of 2% PAA remained higher than the solutions of NaOCl 5.25% and CHX 2%, with a statistically significant difference between the groups (p < 0.001). Such results are like those found by other authors demonstrated that 1% PAA showed less cytotoxic effect than 2.5% NaOCl and 17% EDTA.…”

“…In the present study, there is a great disparity in the results found between the experimental groups 5.25% NaOCl and 2% CHX in comparison to 2% PAA. Although PAA presents positive results for endodontic therapy, such as smear layer removal capacity, 32 and good cell viability, it also demonstrates a significantly lower bacterial decrease than NaOCl and CHX against Enterococcus faecalis biofilm. 38 Thus, its performance as a final irrigator would not improve the disinfection in the irrigation technique.…”

Comparison of the efficacy of laser-activated and ultrasonic-activated techniques for the removal of tricalcium silicate-based sealers and gutta-percha in root canal retreatment: a microtomography and scanning electron microscopy study

“…The root canals were irrigated by 2 mL of 2.5% sodium hypochlorite (NaOCl) (Disineer, Shandong, China) with a 30-gauge side-vented needle (United Dental, Shanghai, China) between each instrument. The final irrigation was 2 mL 17% ethylenediaminetetraacetic acid (EDTA) (Longly, Wuhan, China) for 1 min, followed by 2 mL of 2.5% NaOCl for 1 min and a rinse with 2 mL of saline solution for 1 min[ 24 , 29 ]. Then, the root canals were dried with sterile paper points (Dayading, Beijing, China).…”

Impact of Peracetic Acid on the Dynamic Cyclic Fatigue of Heat-Treated Nickel-Titanium Rotary Endodontic Instrument

“…Moreover, at 5%, PAA could dissolve pulp tissue equally effectively as 2.5% and 5.25% NaOCl [ 8 ]. Its antibacterial effectiveness accompanied by the capability to eliminate the smear layer has made the PAA a promising irrigant, which would speed up and simplify the preparation of root canal [ 23 ]. In an investigation into the combined use of 0.05% PAA with rotary instruments, Gomes et al [ 24 ] introduced it as an alternative to 2.5% NaOCl for removing the smear layer.…”