Resumo

GARCIA, Rubens Nazareno et al. Bond strength of contemporary restorative systems to enamel and dentin. RSBO (Online) [online]. 2011, vol.8, n.1, pp. 60-67. ISSN 1984-5685.

INTRODUCTION AND OBJECTIVE: New aesthetic restorative systems have been recently introduced in dental market. The objective of this study was to evaluate the bond strength of contemporary restorative systems to ground enamel and medium-depth dentin. MATERIAL AND METHODS: Sixty bovine incisors were prepared by using silicon carbide papers to obtain samples of ground enamel and medium dentin (n = 10). The following restorative systems were used: Adper SE Plus / Z350 [SE + Z350], P90 System Adhesive / Filtek P90 [SA + P90] and BeautiBond / Beautifil II [BB + BII]. They were applied to the surfaces, and Tygon tubes were positioned over each sample of hybridized enamel and dentin. The inner space of the tubes was filled in with composites. After light-curing, the tubes were removed and the samples were stored in distilled water at 37°C, for one week. Subsequently, the samples were positioned into a chisel-shaped test device and tested in a universal testing machine (EMIC), with a speed of 0.5 mm/min. Bond strength was calculated in MPa and data analyzed statistically by ANOVA and Tukey test (p < 0.05). RESULTS: No statistical differences were found among groups in enamel. For dentin, [SE + Z350] group resulted in the highest bond strength, while [BB + BII] group showed the lowest bond strength. The comparison between enamel and dentin, for each restorative system, showed that [SE + Z350] resulted in statistically higher bond strength to dentin than enamel. Conversely, [BB + BII] showed higher bond strength to enamel. For [SA + P90], no significant difference was found between enamel and dentin. CONCLUSION: Regarding bond strength, the materials showed different performance in dentin and the same performance in enamel. Only silorane restorative system presented a similar performance in both substrates.

Palavras-chave : dentin; enamel; dentin-bonding agents; shear strength.