Efeitos da aplicação dos líquidos para modelagem nas propriedades físico-mecânicas de resinas compostas

Abstract

The main objective of this study was to investigate the influence of the application of different materials for modeling (Composite Wetting Resin, Scotchbond Multipurpose, Singlebond Universal) on the physical- mechanical properties of resin composites (Vittra, Z350 XT, Forma). This study was divided into 3 chapters, according to each specific objective: chapter 1) to evaluate the surface roughness and color parameters of different modeling liquids of resin composite subjected to staining and simulated toothbrushing; chapter 2) to evaluate the effect of modeling liquids on hardness, contact angle, surface roughness, and bacterial biofilm formation in resin composites; chapter 3) to evaluate the effect of modeling agents on the bond strength (μSBS) and on the failure mode of the immediate repair of resin composite, through the microshear mechanical test and optical microscopy. The response variables used were surface roughness, color stability, whitening index, opacity, surface topography, hardness, contact angle, bacterial adhesion by colony forming unit count and biofilm formation, bond strength and failure mode. After statistical analysis of the data, it was concluded that the tested Scotchbond Multipurpose and Singlebond Universal adhesives provided lower surface roughness values, better color stability, higher whitening index and lower opacity values after staining with red wine and toothbrushing; they also showed a reduction in hardness, an increase in the contact angle and did not negatively influence the surface roughness and bacterial adhesion of the resin composites; and only the air jet cleaning procedure can be performed to achieve an acceptable bond strength in the immediate repair of the resin composite, without the use of a bonding agent.