Evaluation of marginal infiltration by varying the adhesive protocol

Aim: The aim of this study was to evaluate the sealing of composite resin restorations, observing marginal infiltration through a conventional resin by varying the adhesive technique. Materials and Methods: Cavity preparations were performed on the buccal and lingual surfaces with margins at the cement-enamel junction. The samples were divided into three groups (n=10): Group 1-Selective conditioning technique; Group 2-Total conditioning technique; Group 3-Non conditioning. After, the restorations were made using conventional composite resin, immersed in methylene blue (C16H18ClN3S) for seven days and evaluated in a standardized manner, through scores, and analyzed the penetration depth of the dye. Results: The data were submitted to the Tukey test with a significance level of 5%. The results showed that the samples that were not conditioned obtained the highest infiltration rates (p=0.0001). Discussion: The integrity of the margins of a restoration is essential to clinical success, since its absence is directly related to the emergence of interface infiltrations. Conclusion: The authors concluded that the worst group was the one without etching; enamel showed less infiltration than dentin for all groups; the technique of selective etching and total etching obtained similar results regarding microleakage.