[The effect of different liner materials on the polymerization of composites]

It has been shown that the polymerization of certain composite filling materials are inhibited by eugenol containing temporary filling materials. The aim of this study was to evaluate the influence of different lining materials (Ketac-Bond, Vitrebond, Dropsin, Dycal, Alkaliner, Super EBA [= control]) on the degree of polymerization of different composites (Brilliant Lux, Brilliant, Herculite, Dual-Cement). The degree of polymerization was characterized by Knoop hardness measurements. The data were analysed by the Wilcoxon test. All lining materials decreased the hardness of the adjacent zone of the tested composites. Brilliant Lux showed a significant decrease (p < 0.01) in hardness until a distance of 200 microns from all lining materials. The chemical curing composite (Brilliant) was generally less influenced in its polymerization by the tested lining materials. Light-activated glass ionomer materials influenced the polymerization at least. It was concluded that light-activated composites seemed to be more influenced in their polymerization by adjacent lining materials than chemically activated ones.