RESUMO
Objective: To study the effect of Carisolv in caries removal on dentin bonding surface.Methods:24 extracted third molars with moderate carious were randomly divided into four groups. Each cavity was split into two parts, one part was prepared by Carisolv and the other by high-speed bur. Then samples were processed as follows: samples in group A were not treated, those in group B were treated with 320 ml/L phosphoric acid, SEM was used to observe the morphology of dentin surface of the samples in group A and B. Samples in group C were restored with Dyract AP and those in group D with resin for the observation of the microstructure of dentin-filling bonding interfaces.Results:In group A, rough surface without obvious smear layer was exhibited and dentinal tubules were clearly open after Carisolv preparation; after bur preparation, dentin surfaces were covered with a thick smear layer and no opening of tubules was visible. In group B, after treatment with 320 ml/L phosphoric acid, the smear layer was removed and dentinal tubules were exposed after either Carisolv or bur preparation, but tube stoppers were visible in the samples prepared by bur. In group C, resin tags were observed only in the samples after Carisolv preparation. In group D,dentin surfaces and lengths of the resin tags did not show remarkable difference after Carisolv or bur preparation, but more lateral branch connection between resin tags appeared in the samples prepared by Carisolv than by bur.Conclusion:The dentin prepared by Carisolv favors bonding between dentin and resin/compomer and has the advantage of restoring with compomer.