Evaluation of the bond strength of fiberglass posts using a pull-out test after the use of sodium thiosulfate and ascorbic acid to reverse the effect of dentin deproteinization

• DOI: https://doi.org/10.22533/at.ed.13176426270311

• Palavras-chave: : Fiberglass Post, Ascorbic Acid, Antioxidants, Dental Materials.

• Keywords: : Fiberglass Post, Ascorbic Acid, Antioxidants, Dental Materials.

• Abstract:

  The adhesion of the post to the root canal may be altered by the irrigant solution used prior to the cementation of intraradicular retainers. The use of antioxidant agents has shown good results in this process. The objective of this study was to evaluate the bond strength of fiberglass posts using a pull-out test after the use of sodium thiosulfate or ascorbic acid to reverse the oxidizing effect of dentin deproteinization. Ninety-two single-rooted bovine teeth were divided into four groups with different irrigation protocols (G1: irrigation with saline; G2: irrigation with 5% NaOCl; G3: irrigation with 5% NaOCl and 10% ascorbic acid; G4: irrigation with 5% NaOCl and 5% sodium thiosulfate). After cementing the fiberglass posts, a pull-out test was performed. The data obtained were subjected to statistical analysis using the Kruskal-Wallis test with a significance level of 0.05. A statistically significant difference was found among the four tested groups, with the highest mean bond strength in the group irrigated with 10% ascorbic acid following deproteinization with 5% NaOCl. The use of antioxidant agents prior to the cementation of glass fiber posts may contribute to reversing the oxidizing effect of dentin deproteinization and, consequently, improve adhesive strength.