[In vitro evaluation of two composite material for posterior restorations].

In this in vitro study the wear resistance and abrasiveness against opposing enamel cusps, marginal adaptation and radiopacity of two experimental composite resin materials were tested. The results indicated that in particular the fine particles hybrid showed low wear. The radiopacity of both materials tested was just acceptable. Marginal adaptation was insufficient in both cases, the reason being most probably the low viscous bonding agent and the polymerization shrinkage. Therefore both test materials are not suitable for use as direct posterior composite fillings.