Abstract: Our study seeks to mimic the structure of natural enamel by adding nano and micro fillers to acrylic monomers. To determine the effects of filler type and size, glass fibers, silica microrods, TiO2 nanorods, TiO2 nanoparticles, and silica nanospheres were silanized and added to 50:50 BisGMA:TEGDMA matrix, respectively. The microstructure and the organization of the rods and fibers were characterized by SEM. Three- point bend tests were used to determine flexural strength, elastic modulus, and toughness. Vicker’s microhardness and degree of curing were also measured. Because the composite is intended for use in the mouth, samples were characterized in the as-cured and water aged state. Aging did not lead to significant swelling but did affect mechanical properties. Toughness was enhanced by the addition of fibers or rods to the filler mix. The fibers and rods could be organized by centrifuging, settling and packing. Packing was the least effective approach.
Authors: R. Mallu, I.K. Lloyd, K. Mohan, Y. Yang, A. Thapa, J. Marchese, and K-K Chang
Keywords: Composites, Dentistry, Ceramics, Mechanical Properties