[Preparation of hard crown and bridge resin without PMMA powder (III) (author's transl)].

We have been studying hard crown and bridge resins. Mixtures of several polyfunctional monomers and a composite filler finely pulverized, prepared by polymerization of trimethylolpropane trimethacrylate in the presence of hydrophobic colloidal silica, were polymerized and their mechanical properties were studied. They were excellent and a sample from 2.6 E.UDMA comonomer was the best among them. The new filler possessed better affinity with matrices than composite fillers reported previously, presumably due to the reactivity with matrices. Introduction of this new filler into the hard crown and bridge resin preparation must improved the resins remarkably.