[The development of the perfectly adapted MOD composite filling material with tight marginal fitting in vitro findings].

Class II Adhesive Restorations have been realized with composites under laboratory conditions. They show a perfect marginal adaptation and no microleakage at the tooth/restoration interface. These properties were obtained a) with a new cavity preparation, b) by application of a low viscosity sealant prior to the placement of the bulk of the composite material. The Adhesive Restoration compared favorably with conventionally prepared restorations. Nevertheless, enamel conditioning with acid and the use of a low viscosity sealant in conventionally prepared class II cavities resulted also in some improvement of marginal adaptation.