POLYMERIC COMPOSITES FOR DENTISTRY.I: SYNTHESIS AND CHARACTERIZATION OF A NOVEL DENTAL COMPOSITE WITH POLYMERIC MATRIX

摘要

Novel composite materials based on polymer matrix with inorganic filler have been synthesized and characterized in order to evaluate their potential application in dentistry, as restorative materials. The first approach was to generate and characterize a new filler having the composition in the CaO-Al_2O_3-SiO_2 system. The study continued with the development of the polymer matrix based on 2,2 propyl bis-phenyl glycidyl dimethacrylate (Bis-GMA) and triethylenene glycol dimethacrylate (TEGDMA) monomers. Composites containing Bis-GMA and TEGDMA at the ratio (wt/wt) of 75/25, filled with different amounts of filler (up to 80% wt) have been prepared. The photopolymerization was induced in the presence of camphoroquinone/N,N-dimethylaminoethyl methacrylate (CQ/DMAEMA), as photoinitiator system. The degree of conversion of each composite was measured by infrared spectroscopy immediately after being cured and it was correlated with the gel content. Water uptake and Vickers' microhardness were evaluated and correlated with the composition of the composites.