The purpose of this study was to evaluate the effect of the nanoparticles in experimental resin cements on opacity (contrast ratio) and antibacterial activities. Experimental resin cements were prepared with three different kinds of fillers: silica microfiller (0.04 m), silica nanofiller (< 7 nm), and silver nanoparticles (< 5 nm). The contrast ratios of the specimens were evaluated using a spectrophotometer. The distribution morphology of the filler particles in the resin matrix was also examined using energy-filtering transmission electron microscopy. Surface roughness and surface free energy (SFE) characteristics were measured using confocal laser scanning microscopy and the sessile drop method. Shear bond strength were also analyzed. The experimental resin cements that contained more than 3% nanofiller had significantly lower contrast ratios (p < 0.05). The resin cements that contained 6 wt% nanofiller had contrast ratios 50% lower than the composite that did not contain nanofiller. The experimental resin cements that contained 250 ppm silver nanoparticles showed significantly slower bacterial growth than the resin cements that did not contain silver nanaoparticles. This study suggests that experimental resin cements with silver nanoparticles can help prevent enamel demineralization around their surfaces without compromising esthetical and physical properties.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)
Published: June 18, 2012
Pages: 113 - 116
Industry sector: Advanced Materials & Manufacturing
Topics: Materials Characterization & Imaging