Efeito do fluor de um sistema adesivo na resistencia de união e no desafio acido em dentina / Effect of fluoride containing adhesive system on microtensile bond strength and acid challenge on dentin

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Despite of the advance in adhesive dentistry, it is not possible to achieve an ideal bonding between composite resin and dental substrate. Currently, a variety of adhesive systems have been used. However, any adhesive system is capable to hamper the marginal leakage, degradation, and secondary caries formation at dentin-resin interfaces in long-term. For that reason, as an alternative, fluoride was incorporated in adhesive in order to promote an antibacterial action and to impede the secondary caries formation, onsequently increasing the longevity of restoration. Thus, the objectives of this study were: (1) to evaluate the influence of a fluoride-containing adhesive on the microtensile bond strength (`mu´TBS) in dentin, and to analyze the ultra-structure of the dentin-adhesive interface after acid challenge; (2) to evaluate the influence of fluoride-containing adhesive on `mu´TBS after 24 hours and 3 months waterstorage; to observe an acid-resistant zone at resin-dentin interface using polarized light microscopy (PLM) after 24 hours and 3 months water storage, and to compare the degree of conversion of fluoride-containing adhesive with non-fluoride containing adhesives after 24 hours, 1 week, and 1 month. For both, to the `mu´TBS test and to analyze the ultra-structure of interfaces: free-caries human third molars were used for restorations, in accordance with of the analyzed groups in each specific study. In order to measure the degree of conversion, chips of adhesives were prepared at a constant temperature and in a nitrogen atmosphere for the analysis at Fourier Transform-Raman spectroscopy (FTIR). The results showed that the present fluoride-containing adhesive has a positive effect in bonding strength, although the lower degree of conversion compared with non-fluoride adhesives. The photomicrographs of SEM and PLM demonstrated that fluoride-containing adhesive allow the formation of an inhibition zone adjacent to the hybrid layer after acid challenge

ASSUNTO(S)

dental adhesives adesivos dentarios resistencia dos materiais microscopia materiais dentarios tensile strength microscopy dental materials

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