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A Journal on Dentistry and Maxillofacial Surgery
Minerva Stomatologica 2007 March;56(3):105-14
language: English, Italian
Bond strength to deep coronal dentin: effect of bonding strategies
Giovannone T. 1, Migliau G. 1, Bedini R. 2, Ferrari M. 3, Gallottini L. 1
1 Unit of Endodontics Department of Conservative Dentistry La Sapienza University Policlinico Umberto I, Rome, Italy.
2 Department of Technology and Health Italian National Institute of Health, Rome, Italy
3 Department of Restorative Dentistry and Dental Materials University of Siena Policlinico Le Scotte, Siena, Italy
Aim. The aim of this study was to evaluate bond strength at the composite-adhesive-deep dentin interface following pre-treatment with sodium hypochlorite using 4 different types of enamel-dentin adhesive and a composite for the core.
Methods. From 60 healthy human molars, cylindrical samples (3 mm high) were obtained using a special slow-speed saw. Cavities with 2-5-mm diameters were made in all the samples. Samples were assigned to 8 groups, 4 groups were designated as experimental groups and were irrigated with NaOCl and the other 4 groups designated as control groups were irrigated with distilled water. Adhesive systems were applied to the samples and then restored using a core build-up composite. Samples were subjected to shear stress test using an electronic dynamometer.
Results. The data were analyzed using one-way ANOVA and the Tukey test (P<0.05). The results, in terms of bond strength, demonstrate that the two-step self-etch adhesive systems generate a stronger bond than the other systems considered in the study (P<0.05). The results also show that pre-treatment with hypochlorite does not seem to influence the bond strength of self-etch adhesive systems.
Conclusion. This in vitro study demonstrates that there exist differences in bond strength between self-etch and etch & rinse adhesive systems on deep dentin pretreated with sodium hypochlorite to simulate endodontic treatment