Resumo

SIMAS, Camila Maria de Sousa et al. Substrate and type of dental adhesive's effect on microleakage in composite resin restoration. Odontol. Clín.-Cient. (Online) [online]. 2011, vol.10, n.1, pp. 43-47. ISSN 1677-3888.

It was evaluated in vitro the substrate influence (bovine and human) and the adhesive system (total etching and self-etching primer) on microleakage, in class II restoration. In 16 human third molars and 16 bovine incisors were prepared two proximal cavities vertical "Slot" (OM-DO), with the gingival margin in dentin. Then, the cavities were divided into four groups (n = 16) according to the adhesive and the substrate: group I - human substrate / total etching adhesive, group II - human substrate / self-etching primer adhesive, group III - bovine substrate / total etching adhesive, group IV - bovine substrate / self-etching primer adhesive. The cavities were restored with Tetric Ceram composite with three increments. Then the teeth were stored at 37 º C for 30 days. After that, sealed with cosmetic nail varnish, immersed in a 50% solution of silver nitrate, for 2 hours, washed and immersed in revealing solution for 6 hours. After the samples were sectioned and analyzed in a 25X loupe. Data were subjected to nonparametric statistical analysis of Kruscal-Wallis (p<0.05) revealed the existence of significant differences between the adhesives (p=0.000). Regarding to the substrate, there was no significant difference (p>0.05). It was concluded that: the human and bovine substrates behaved statistically in a similar way, the total etching adhesive behaved statistically significant.

Palavras-chave : Microleakage; Substrate; Dental adhesives.