Compomers adaptation to Class I and V cavities in permanent teeth.

This study evaluated the adaptation of Compoglass, Dyract and Hytac to Class I and V cavities and the effect of etching on that adaptation. Sixty molars were used, divided for the three compomers used, which were subdivided for Class I and V and redivided into etched and nonetched cavities (5 each). Standard Class I and V cavities were prepared. The adhesives were applied and the cavities restored with the compomers. The restoration was finished and the cavosurface margins examined under the light microscope for any gap formation. The restored cavity was sectioned in two halves, which were fixed in glutaraldehyde and polished. The restoration-tooth interface was examined under the light microscope for any existent gap. Then one half from each tooth was prepared for SEM examination. The results revealed good adaptation of the compomers at the cavosurface margins except nonetched Class V cavities restored with Dyract. Restorations in Class V were more adapted than Class 1. Dyract and Compoglass showed better adaptation inside the cavity than Hytac. Cementum wall displayed good adaptation with all restorative materials. Etched cavities showed consistent hybrid layer formation whereas nonetched cavities showed interrupted hybrid layer with poor resin penetration.