Avaliação da resistência de união à microtração e habilidade de selamento de um adesivo dental com própolis

Abstract

Introduction: Ethyl acetate extract of red propolis from Alagoas (EAEPV) was added to an experimental methacrylate-based adhesive (EA) to obtain adhesives with propolis at following concentrations: 100 (EA PV100), 250 (EA PV250) e 500 μg/mL (EA PV500). Single Bond Universal adhesive (SB) (3M ESPE) and AE without propolis were used as controls. Objective: This study aimed to analyze both dentinal and coronal sealing ability and microtensile bond strength of a dental adhesive with propolis. Material and methods: The microtensile bond strength was measured 24 hours after the bonding process. The effectiveness of the dentin sealing of adhesives with propolis was evaluated at nanoscale (silver uptake) and coronal marginal sealing at microscale (dye microleakage). The data were analyzed using one-way analysis of variance (ANOVA) and Tukey’s test (α=0.05). Results: An amber-pinkish experimental adhesive with appearance comparable to commercial adhesives were obtained. Immediate bond strength values ranged from 28.94 + 9.25 MPa (EA PV100) to 39.09 + 9.60 MPa (SB). Comparing SB and EA with propolis, a significant reduction in bond strength was noted (p<0.05). The EA without propolis had similar performance to SB (p-1.000). Conclusion: The addition of silica and titanium nanoparticles did not change the immediate bond strength of the dentin/resin interface. EA PV500 presented better dentinal and coronal sealing than the SB adhesive and the control. The dentin bond strength of the adhesives was reduced by the addition of propolis. However, at concentration of 500 µg/mL, the adhesive with propolis showed the best coronal sealing, with better performance than the control and the commercial adhesive.