Análise da resistência térmica de um adesivo dentinário com própolis vermelha de Alagoas

Abstract

Introduction: A limitation that affects the adhesive-dentin bonding interface is the degradation that occurs over time, which compromises the durability of restorations over the years. Objectives: The aim of this research was to study the thermal stability of dental adhesives containing extract of red propolis from Alagoas. Materials and methods: An experimental adhesive (EA) based on methacrylates with extract of red propolis from Alagoas (EPV) was used. Then the adhesives were distributed following experimental groups: G1: AE without propolis (Control); G2: EA + EPV 250g/mL; G3: EA + EPV 300g/mL; G4: Single Bond Universal (3M/ESPE). Thermal stability was evaluated by differential scanning calorimetry (DSC). From each adhesive, 2 mg was placed in an alumina test vial and photoactivated for 20s. Thermal phenomena in the range of 25–200 ºC were recorded for each sample. Results: Adhesives with EPV showed greater thermal stability during temperature increasing. Conclusion: The incorporation of EPV to the experimental adhesive at the concentrations used in this study collaborates to improve its thermal resistance.