Influence of primer and adhesive mixture on the real-time polymerization and mechanical properties of experimental dental adhesives / Influência da mistura de primers e adesivos na polimerização em tempo real e nas propriedades mecânicas de adesivos dentais experimentais

• Autor(a) principal: Humel, Maria Malerba Colombi
• Data de Publicação: 2020
• Outros Autores: Prieto, Lucia Trazzi, Pierote, Josué Junior Araujo, Araujo, Cintia Tereza Pimenta de, Câmara, João Victor Frazão, Barbosa, Isabel Ferreira, Carvalho, Guereth Alexsanderson Oliveira, Paulillo, Luis Alexandre Maffei Sartini
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista Veras
• Texto Completo: https://ojs.brazilianjournals.com.br/ojs/index.php/BRJD/article/view/15263
• topic: Flexural strength; elastic modulus; degree of conversion; adhesive layer; hybrid layer.

Objective: To evaluate the influence of primer concentration on the physical and chemical properties of model adhesive systems. Materials and methods: Two model adhesives were tested: M1 (40% BisGMA and 60% HEMA) and M2 (40% BisGMA, 40% HEMA and 20% TEGDMA). The mixture of adhesives with four different concentrations of the primer agent (0, 5, 10 and 15%). The properties evaluated were flexural strength (FS), elastic modulus (E), degree of conversion (DC), the kinetics of conversion (K) and the rate of polymerisation (RP). To evaluate the mechanical properties, were prepared specimens using silicone bar moulds (7 mmX2 mmX1 mm), and tested them by the three-point bending test at a crosshead speed of 0.5 mm/min. DC and the kinetics of cure were measured by Fourier Transform infrared spectroscopy (FTIR). Results: The FS and E of all adhesives tested were not affected by different primer concentrations. All adhesives had decreased DC as the primer concentration increased. In the real-time conversion, the model adhesives presented decreased RP according to increases in primer concentration. Conclusions: Mechanical properties of non-solvated adhesives were not affected by the primer concentrations tested and the DC and RP were influenced by concentrations of the agents.