Efeito da smear layer na degradação da união entre a dentina e um sistema adesivo autocondicionante
Effect of the smear layer on the degradation of dentin bonds produced by a self-etching adhesive system
Sanabe, M.E.; Jacques, P.; Ricci, W.A.; Costa, C.A.S.; Hebling, J.
Rev. odontol. UNESP, vol.38, n1, p.45-51, 2009
Abstract
O objetivo deste estudo foi avaliar o efeito da incorporação da smear layer na degradação da união resina-dentina produzida por um sistema adesivo primer autocondicionante. Superfícies planas em dentina foram obtidas de 24 molares e divididas em três grupos (n = 8) de acordo com o tratamento da smear layer: sem remoção (G1), remoção com ácido fosfórico (G2) ou EDTA (G3). Após o tratamento da smear layer, o sistema Clearfil SE Bond foi aplicado, seguido da construção da coroa em resina. Os dentes foram seccionados para a produção de espécimes com área de secção transversal de 1 mm2, que foram armazenados por 24 horas ou 24 meses em água previamente ao ensaio mecânico de microtração. Aos dados de resistência de união (RU), foram aplicados teste-t de Student e de ANOVA a um critério fixo, complementado por teste de Tukey (α = 0,05). Os maiores valores de RU para ambos os períodos de envelhecimento foram registrados para G3. Redução significante da RU foi observada para todas as condições de tratamento da smear layer: 21,6, 26,6 e 21,7% para G1, G2 e G3, respectivamente. Em conclusão, embora a remoção da smear layer com EDTA tenha favorecido o aumento da resistência de união imediata do sistema Clearfil SE Bond, a degradação da união resina-dentina não foi negativamente afetada pela incorporação dessa estrutura.
Keywords
Dentina, camada de esfregaço, adesivos dentinários, resistência à tração,
degradação.
Resumo
The aim of this study was to evaluate the effect of the incorporation of the smear layer on the degradation of resin-dentin bonds produced by a self-etching adhesive system. Flat dentin surfaces were produced from 24 molars and randomly assigned to three groups (n = 8) according to the treatment of the smear layer, no removal (G1), removal with phosphoric acid (G2) or EDTA (G3). After treating the smear layer, Clearfil SE Bond was applied on the surface followed by the built-up of a resin crown. The teeth were cut to produce specimens with a crosssectional area of 1 mm2, which were stored in water for 24 hours or 24 months before being tested under tension. Bond strength data were analyzed by Student’s t-tests and ANOVA complemented by Tukey at a preset level of significance of 5%. The highest bond strengths, for both periods of aging, were produced in G3. Significant reduction in bond strength was recorded for all groups, 21.6, 26.6 and 21.7% for G1, G2 and G3, respectively. In conclusion, although the removal of the smear layer with EDTA significantly improved the immediate bond strength, the incorporation of the smear layer did not adversely affect the biodegradation of resin-dentin bonds.
Palavras-chave
Dentin, smear layer, dentin bonding agents, bond strength, degradation
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