Effect of the addition of silanated silica on the mechanical properties of microwave heat-cured acrylic resin

Lucas H. Da Silva, Sabrina A. Feitosa, Marcia C. Valera, Maria A.M. De Araujo, Rubens N. Tango

Research output: Contribution to journalArticle

8 Scopus citations


Objectives: The purpose of this study was to evaluate fthe 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 × 10 × 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 (α = 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.

Original languageEnglish (US)
Pages (from-to)e1019-e1023
Issue number2
StatePublished - Jun 1 2012
Externally publishedYes


  • acrylic resin
  • microwave heat-cured
  • reinforcement
  • silica

ASJC Scopus subject areas

  • Dentistry(all)
  • Geriatrics and Gerontology

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