The purpose of this study was to investigate the effect of silver nanoparticles with different ratios on the compressive strength of the acrylic denture base. A total of eighty specimens (4 mm in diameter and 6 mm thickness) were fabricated from self-cured acrylic resin. Four groups (n = 20) were divided according to the concentration of silver nanoparticles incorporated to acrylic resin: 0, 1, 2 and 3 % w/w. All specimens were prepared for the compressive strength test using universal testing machine. The dispersion of silver nanoparticles was evaluated by Scanning Electron Microscope (SEM). Polymerization was analyzed by Fourier Transform Infrared Spectroscopy (FTIR). The result showed that the compressive strength of acrylic resin containing 2 % and 3 % of silver-nano was significantly higher than that of acrylic resin containing 1 % silver-nano and the control group (p < 0.05). SEM images confirmed the presence of silver-nano embedded to the polymer matrix. Nanoparticles are homogeneously dispersed over the specimen surface. In addition, polymerization of different ratios of silver nanoparticles was not different. This study showed that the concentrations of silver nanoparticles affect the compression strength of the acrylic resin. They are correlated: The higher the concentration of silver-nano, the greater the compressive strength. Moreover, the addition of silver nanoparticles
has no effect on the polymerization of acrylic resin