Adesão de resina composta a cimento de ionômero de vidro submetido a diferentes tratamentos de superfície

• Autor(a) principal: Ramos, Amanda Barreto
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/14199
• topic: Glass Ionomer Cements; Shear Strength; Composite resins; Adhesives; Cimentos de Ionômeros de Vidro; Resistência ao Cisalhamento; Resinas compostas; Adesivos; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The association of glass ionomer cement (GIC) and composite resin is widely indicated in dental clinical procedures. The association of the two materials aims to combine the desirable characteristics of each one increasing the properties and the success rate of the final restoration. Based on this, the aim of this study was to evaluate, through a microshear test, the better surface treatment of glass ionomer cements, in the initial stages and after thermocycling, in order to ensure an effective and durable adhesion to composite resins. Standard cavities were made (0,2x1x1cm) in a circular acrylic resin matrix in which the GIC (Ionofil Plus - VOCO, Germany) was inserted. Eighty samples were divided into 8 groups (n = 10). Five resin composite test bodies were made in each sample, generating 50 per group and a total of 400. Groups were divided according to the surface treatment (adhesive application, desiccation with compressed air, etching, roughening with a bur), and according to the type of adhesive system used (two-step etch-rinse and single-step self-etching). After treatment, the samples were stored in humid conditions for 48 hours and then half of the specimens in each group was submitted to microshear test and the other half to thermal cycling with 10.000 cycles of 20s each one at temperatures of 5 and 55°C and then microshear test. The results of microshear resistance were analyzed with Two-way ANOVA and Tukey s HSD post hoc test with a significance level of 0,05 (p <0.05). The bond strength in aged group were lower and showed statistically significant difference (p = 0) when compared to the groups that had the same surface treatment, but were not aged. The roughening of the surface followed by etching showed the highest bond strength values in both stages. All samples were analyzed in optical microscopy to evaluate the type of fracture that occurred in the adhesive interface. Then, representative samples were prepared for analysis by scanning electron microscopy (SEM) and x-ray spectroscopy for energy dispersion (EDS / EDX). Under the conditions of the study, it was concluded that the roughening of the glass ionomer surface, followed by etching and conventional adhesive system represented the best option of adhesive strategy.