Abstract
The article deals with the results of the study of enamel, dentin and composite restorations of permanent teeth in vitro, regarding microhardness and micromorphology of the enamel surface, dentin and composite restorations of the samples got by Knoop method. Domestic photopolymer material Restavrin was used as a composite. It was compared with Restavrin under the sealant Optiguard. Microhardness of the restoration was measured on the 10, 30 and 45 day after putting into glass-tubes with artificial saliva filled with mixture of oral streptococcus S. mutans and S. oralis. At all dates of research with the covering by Optiguard, microhardness of enamel and dentin in the places of contact with Restavrin and composite, turned out to be actually higher (p
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