Effect of Silver Nanoparticles on Flexural Strength of Two Types of Methyl Methacrylate, Selecta Plus and Rapid Repair

  • Ahmad Sowdagar, Tehran University of Medical Sciences, Iran
  • Negar Javadi, Tehran University of Medical Sciences, Iran
  • Mohammadzaman Kassaee, Tarbiat Modarres University, Iran
  • Sepideh Arab, Tehran Univercity of Medical Sciences, Iran
  • Marta Treccani, Department of Orthodontics, School of Dentistry, University of Aarhus, Aarhus, Denmark
  • Kim Carlsson, Department of Orthodontics, School of Dentistry, University of Aarhus, Denmark
  • Thrøstur Thorgeirsson, Department of Orthodontics, School of Dentistry, University of Aarhus, Denmark
  • Birte Melsen, Department of Orthodontics, School of Dentistry, University of Aarhus, Denmark

Objectives: silver nanoparticle is one of the products of nanotechnology which is used in many fields. It is also added in poly methyl methacrylate because of its antimicrobial properties. It is still unknown that this addition will result in better mechanical properties or not. The aim of this study is to investigate the effect of silver nanoparticles on the flexural strength of two types of poly methyl methacrylate.
Methods: acrylic liquid containing 0.05% and 0.2% silver nanoparticles was used with two kinds of acrylic resin (Rapid Repair & Selecta Plus).two groups without nanoparticles were used as control groups. For each group flexural strength was investigated via Three Point Bending method for 15 acrylic boxes. Two way ANOVA, one way ANOVA and Tukey tests were used for statistical analysis.
Results: Rapid Repair without nanoparticles showed the most flexural strength. Addition of 0.05% nanoparticle in Rapid Repair, significantly increased flexural strength while, continuing addition up to 0.2% reduced it nearly up to its primary level. In Selecta Plus, addition of nanoparticles increased flexural strength but flexural strength by addition of 0.05% nanoparticles was more than 0.2%.
Conclusion: addition of nanoparticles has different effects on different types of poly methyl methacrylate. Therefore several other factors such as different concentrations of nanoparticles should also be important in the flexural strength of acrylics.