| 摘要 |
A dental material is based on a polymerisable, ethylenically unsatd. monomer as binder, a catalyst for cold, hot and/or photo-polymerisation, and 1-95 wt.% of an inorganic filler comprising a mixt. of (A) spherical particles based on SiO2 and (b) non-spherical scale powder of quartz, glass ceramic and/or glass, with refractive index 1.50-1.58 and particle size 0.5-5.0 microns. Component (A) is present in the final dental material as separate spherical particles of (A1) SiO2 with refractive index from 1.38 to below 1.50 and particle size 0.04-1.5 microns, (A2) a SiO2 core coated with an oxide of an element of Gps. (I), II, III and/or IV, where the coated particle has refractive index of 1.45-1.62 and prim. particle size of 0.04-1.5 microns, and the layer thickness is 15-40 nm, and/or (A3) the particles (A1) or (A2) coated with a 5-50 nm layer of a polymerisable organic binder based on mono- or poly-functional (meth)acrylates and/or reaction prods. from isocyanates and methacrylates contg. OH gps., where the prim coated particle has refractive index of 1.40-1.52 and particle size 0.04-1.5 microns. |
