A filled and polymerizable dental material is described which contains a sol of SiO.sub.2 particles in a liquid, organic dispersion agent, the SiO.sub.2 particles being organically surface modified, having an average size of 10 to 100 nm and being non-agglomerated....http://www.google.com/patents/US5936006?utm_source=gb-gplus-sharePatent US5936006 - Filled and polymerizable dental material
