da Silva, Lucas H. [UNESP]Feitosa, Sabrina A. [UNESP]Valera, Marcia C. [UNESP]de Araujo, Maria A. M. [UNESP]Tango, Rubens N. [UNESP]2014-05-202014-05-202012-06-01Gerodontology. Hoboken: Wiley-blackwell, v. 29, n. 2, p. E1019-E1023, 2012.0734-0664http://hdl.handle.net/11449/22778Effect of the addition of silanated silica on the mechanical properties of microwave heat-cured acrylic resinObjectives: The purpose of this study was to evaluate the flexural strength and Vickers hardness of a microwave energy heat-cured acrylic resin by adding different concentrations of silane surface-treated nanoparticle silica.Methods: Acrylic resin specimens with dimensions of 65 x 10 x 2.5 mm were formed and divided into five experimental groups (n = 10) according to the silica concentration added to the acrylic resin mass (weight %) prior to polymerisation : G1, without silica; G2, 0.1% silica; G3, 0.5% silica; G4, 1.0% silica; and G5, 5.0% silica. The specimens were submitted to a three-point flexural strength test and to the Vickers hardness test (HVN). The data obtained were statistically analysed by ANOVA and the Tukey test (alpha = 0.05).Results: Regarding flexural strength, G5 differed from the other experimental groups (G1, G2, G3 and G4) presenting the lowest mean, while G4 presented a significantly higher mean, with the exception of group G3. Regarding Vickers hardness, a decrease in values was observed, in which G1 presented the highest hardness compared with the other experimental groups.Conclusion: Incorporating surface-treated silica resulted in direct benefits in the flexural strength of the acrylic resin activated by microwave energy; however, similar results were not achieved for hardness.E1019-E1023engacrylic resinsilicamicrowave heat-curedreinforcementArtigo10.1111/j.1741-2358.2011.00604.xWOS:000308547000142Acesso restrito