Effect of sodium ascorbate on bond strength of different adhesive systems to NaOCl‐treated dentin

Abstract

The aim of this study was to evaluate the effects of sodium ascorbate on bond strength of different adhesive systems to NaOCl-treated dentin. Eighty extracted molar teeth were used in the study. The buccal enamel surfaces were removed to obtain a flat dentin surface. The teeth were mounted in self-curing resin and dentin surfaces were irrigated with NaOCl for 10 min. Half of the specimens were treated with sodium ascorbate for 10 min. The teeth were randomly assigned to four subgroups according to the adhesive systems used (Clearfil SE Bond, Clearfil Tri-S Bond, Adper Prompt-L-Pop, Adper Single Bond 2). Bond strengths were determined with a Universal Testing Machine, at a crosshead speed of 0.5 mm/min. Data were statistically analysed using anova at a significance level of 0.05. Two-way ANOVA revealed that the effect of sodium ascorbate application on bond strength of adhesive systems to NaOCl-treated dentin was statistically significant (P < 0.05). The bond strength results were significantly influenced by the application of sodium ascorbate (P < 0.05) and there was a significant difference between the adhesive systems (P < 0.05). Although statistically significant differences were not demonstrated in all adhesive resin groups, sodium ascorbate application after NaOCl treatment improved the bond strength values.

Effect of sodium ascorbate on degree of conversion and bond strength of RealSeal SE to sodium hypochlorite treated root dentin

“…Use of 10% sodium ascorbate, a reducing agent, after NaOCl irrigation has demonstrated increased bond strength of resin-based obturation system 30) and other adhesive materials 31) . Similarly, the application of sodium ascorbate, between irrigation of 1.3% NaOCl and MTAD, resulted in a significant increase in bond strength in the present study.…”

Impact of chemical agents for surface treatments on microhardness and flexural strength of root dentin

“…15 Although the application of the aforementioned agents or their associations can preserve or improve the adhesion of resin materials to radicular dentin, 3,4,5,6,7,16,17 changes in organic and mineral content caused by these chemicals 18 could negatively affect the physical properties of dentin, thus causing root fragility.…”

“…11 Additionally, by applying NaOCl on the acid-demineralized dentin, 12 the exposed collagen is removed, 5 and the wettability of the bonding substrate 9 and resin infiltration may be facilitated.…”

“…3,4 However, despite the possible bond strength improvement, 3,4,5,6,7 the mechanical properties of the treated dentin could be affected by the chemical substances.…”

“…19,23 Considering that the agents evaluated in this study are used for the pretreatment of dentin in order to improve the adhesion process, the exposure of dentin to chemical substances was conducted for time periods to restore and improve the bond strength. 2,3,4,5,6 The periods of exposure to treatment agents were based on previous investigations of dentin pretreatment with NaOCl, 3 CHX, 3,4 phosphoric acid 2 and sodium ascorbate. 5 Other chemical agents and treatment protocols seemed to be important factors affecting the mechanical properties of the root dentin.…”