Author(s)

Renata Pavanello^1*, Sérgio Luiz Pinheiro²

¹Health Sciences, Pontifícia Universidade Católica de Campinas (PUC-Campinas), Campinas, Brazil.
²Master’s Program in Health Sciences, School of Dentistry, PUC-Campinas, Campinas, Brazil.

The purpose of this study was to evaluate the influence of acid etching on the bond strength of a universal adhesive system (Single Bond Universal, 3M) to caries-affected dentin. Forty permanent third molars were selected and carious lesions were induced by the microbiological method with S. mutans ATCC25175. Teeth were allocated randomly across four experimental designs (n = 10): PA-I: phosphoric acid etching and application of the adhesive system, followed by immediate microtensile bond strength testing; PA-CC: phosphoric acid etching and application of the adhesive system, followed by microtensile bond strength testing after a 14-day cariogenic challenge; NPA-I: application of the adhesive system without acid etching, followed by immediate bond strength testing and NPA-CC: application of the adhesive system without acid etching followed by bond strength testing after 14-day cariogenic challenge. For microtensile bond strength testing, a restoration with Charisma composite resin was made and each specimen was sectioned with a cross-sectional area of 1 mm². Only adhesive and mixed fractures were considered for bond strength calculation. Results were evaluated by the Kruskal-Wallis and Friedman tests. The highest bond strengths were observed in the phosphoric acid etching groups (p < 0.05). Cariogenic challenge did not affect bond strength (p > 0.05). The predominant fracture type was adhesive. We conclude that phosphoric acid increased the bond strength of the Single Bond Universal system to caries-affected dentin, and that cariogenic challenge did not interfere with this bond strength.

Caries-Affected Dentin, Universal Adhesives, Hybrid Layer, Collagen Fibers, Microtensile Bond Strength

Pavanello, R. and Pinheiro, S. (2018) Influence of Phosphoric Acid Etching on the Bond Strength of a Universal Adhesive System to Caries-Affected Dentin. Advances in Biological Chemistry, 8, 37-46. doi: 10.4236/abc.2018.83004.