Efeito do tempo de evaporação do solvente residual sobre a resistência de união imediata de adesivos contendo própolis

Abstract

Introduction: The constituents of adhesive systems provide them with unique properties, which make them highly efficient, with solvents being prominent components. Objective: The aim of this study was to evaluate the effect of the time used to remove residual solvent from dentin adhesives with propolis on the immediate bond strength. Materials and methods: An experimental methacrylate-based adhesive (AE) was synthesized. Red propolis (PV) was added to the AE and to the Single Bond Universal (SB) adhesive at the following concentrations 20 μg/mL, 250 μg/mL and 500 μg/mL. Pure AE and SB were used as controls. Two layers of adhesive were applied to the phosphoric acid etched dentin surface. To remove residual solvent was a slight air blow was applied for 5, 10 or 15s and then the adhesive was light-cured. Four microcylinders of composite were bonded to the dentin. After 24h in distilled water at 37 °C, the shear bonding-strength (SBS) test was performed. ANOVA two-way followed by Tukey test were used for data analysis (α=0.05). Results: Considering each adhesive tested, there was no significant difference for any time of the air application for solvent evaporation (p=0.425). Analysis by adhesive type showed that the addition of propolis did not change significantly the adhesive strength to dentin (p>0.05). The AE PV500 10s group showed the highest shear strength (8.18 + 1.77 MPa) among all AE groups. The same happened with the SB PV500 10s group (14.73 +4.76 MPa), compared to the SB groups. Conclusion: The times tested in this study to remove residual solvent from dentin adhesives with propolis have been no-influence the immediate shear bond strength.