Structural Properties and Resistance against Abrasion of Some New Dental Materials

Abstract

Experimental dental composite materials were obtained using urethane aliphatic dimethacrylate monomers (isophorone diisocyanate 2-hydroxyethyl methacrylate) and Bis GMA respectively as organic phase. Glass containing barium oxide and colloidal silica, and quartz and colloidal silica respectively was used as inorganic fillers. X ray diffraction spectra showed that the inorganic barium glass is a vitreous amorphous phase embedding crystalline SiO2. For the related composites, the wear depth and the morphology (using SEM) were determined. The micrographs of the specimens illustrated the influence of the composition of inorganic filler on the morphology of obtained composites, as well as that of the organic matrix on the shiny composite surface. C3 composites, that contain the greatest amount of glass, reported a good smoothness of composites surface and good wear behavior. The abrasion test of each material shows that the wear depth depends on: the composition of inorganic filler, the size and distribution of particles for each sample. A material submitted to abrasion may have its roughness increased or reduced, depending on the proportion organic matrix/inorganic fillers and particle size in its composition