Abstract

PINHEIRO, Sergio Luiz et al. Influence of cavity contamination on marginal adaptation of composite resin restorations. Rev. Assoc. Paul. Cir. Dent. [online]. 2016, vol.70, n.1, pp. 70-75. ISSN 0004-5276.

Objective: evaluate the influence of cavity contamination on marginal adaptation of composite restorations and the association of lysozyme to the adhesive system. Materials and Methods: Were selected 40 permanent third molars and made cavity preparations class V with cylindrical diamond burs 1090 (4 mm wide, 6 mm long and 2 mm deep). All teeth were sterilized and randomly divided into 4 groups (n = 10): G1: adhesive system (SA) and restoration with composite resin (CR); G2: cavity contaminated with 10 μl of Streptococcus mutans (0.5 McFarland), SA and RC; G3: adhesive system associated with lysozyme (ADL) and RC and G4: cavity contaminated with 10 μl of Streptococcus mutans (0.5 Mc Farland), ADL and RC. Lysozyme was added to the SA with a microbrush embedded in the SA and powdered lysozyme. The teeth were sealed and immersed in a methylene blue for 4 hours at 37 ° C. The teeth were sectioned and photographed. Results: The evaluation of microleakage was made by two reviewers using the Tpsdig Program. To assess the calibration of examiners, we used the Pearson correlation test. The mean percentages of cracks and bubbles were submitted to Kruskal Wallis test at 5% significance level. Conclusion: the cavity Streptococcus mutans contamination resulted in the formation of cracks between the composite resin and the cavity margins. Lysozyme associated with the adhesive system did not influence the formation of cracks and bubbles in the composite restorations.

Keywords : adhesives; streptococcus mutans; dental leakage..