Resistência flexural, dureza, grau de conversão e sorção da resina acrílica modificada por poliestireno

Abstract

The improvement of dental materials is a constant practice in dentistry. The aim of this study was to verify the properties of self-cured acrylic resin modified by the incorporation of polystyrene particles and compare them with those of the commercial material in order to find similarities or differences between them. Concentrations of 10%, 20% and 30% by weight of polystyrene particles were added to the commercial acrylic resin powder. Four groups were determined, being G1(control group), G2(10% polystyrene addition), G3(20% polystyrene addition) and G4(30% polystyrene addition), submitted to four tests: three point bending, Vikers hardness, degree of conversion, sorption and water solubility. The data were analyzed using the PSPP statistical software to verify the normality and homogeneity of the values, then the ANOVA test was applied and Tukey's complementary test in case of statistical significance. Non-normal values were submitted to the Kruskall-Wallis non-parametric test. The results obtained showed that there was no statistical difference for hardness, degree of conversion and water sorption in the tested groups. For solubility, G2 was statistically equal to G1, in the same way as between G3 and G4. For flexural strength, all groups showed statistical difference among themselves. G2 and G3, G3 and G4 were statistically equal for modulus of elasticity. The lower incorporated concentrations behaved similarly to the commercial material. The addition of polystyrene in particulate form to a disposable plastic material can reduce acrylic resin manufacturing costs, in addition to helping to lessen the impact of this plastic on the environment.