Influência do gel de ascorbato de sódio na resistência adesiva entre resina composta e esmalte clareado
Influence of the sodium ascorbate gel on bond strength between resin composite and bleached enamel
Marson, F.C.; Sensi, L.G.; Vieira, L.C.C.; Baratieri, L.N.
Rev. odontol. UNESP, vol.36, n1, p.17-21, 2007
Resumo
O objetivo deste estudo foi avaliar o efeito de diferentes géis de ascorbato de sódio na resistência adesiva entre resina composta e esmalte clareado. Vinte e quatro molares humanos foram selecionados e seccionados no sentido mésio-distal, formando 48 espécimes de esmalte divididos em seis grupos (n = 8): G1- sem clareamento; G2 - somente clareado (P.H. a 7,5%); G3 - clareado + ascorbato (P.H. a 7,5% + 10% de gel ascorbato de sódio); G4 - clareado + ascorbato + flúor (P.H. a 7,5% + 10% de gel ascorbato de sódio com fluoreto de sódio a 2%); G5 - clareado + ascorbato (P.H. a 7,5% + 40% de gel ascorbato de sódio) e G6 - lareado + diário (P.H. a 7,5% + 40% gel de ascorbato de sódio). O clareamento foi executado por 1 hora/dia, durante 14 dias, com peróxido de hidrogênio a 7,5%. Nos Grupos 3, 4 e 5, os géis de ascorbato foram aplicados apenas uma vez após o término da última sessão de clareamento. No Grupo 6, o gel de ascorbato a 40% foi aplicado diariamente. Após 24 horas, foram realizados os procedimentos adesivos com Single Bond + Filtek Z-250 (3M-ESPE). Os espécimes foram cortados e a resistência adesiva testada em máquina de ensaio universal (Instron, Modelo 4444, Canton, Ma, EUA). As médias da resistência adesiva e do desvio padrão (MPa + SD): G1 - 25,78a (±9,19); G2 - 5,31b (±6,41); G3 - 14,02b (±7,11); G4 - 13,97b (±4,76); G5 - 20, 49ab (±4,64) e G6 - 27,11a (±6.67). A utilização do gel de ascorbato de sódio a 40%, tanto em única aplicação (G5) ou quando utilizado diariamente (G6), resultou em valores de adesão similares aos do grupo controle.
Palavras-chave
Clareamento de dente, adesivos dentinários, peróxido de hidrogênio.
Abstract
The objective of this study was to evaluate the effect of different sodium ascorbate gels on the bond strength between composite resin and bleached enamel. Twenty-four recently extracted human molars were selected and sectioned (mesio-distally) to form 48 enamel specimens, that were randomly divided into six study groups (n = 8): G1 - without bleaching (control group); G2 - bleaching (7.5% hydrogen peroxide); G3 - bleaching + 10% sodium ascorbate gel; G4 - bleaching + 10% sodium ascorbate gel with 2% sodium fluoride; G5 - bleaching + 40% sodium ascorbate gel and G6 - bleaching + 40% sodium ascorbate gel (daily use). Bleaching was performed 1h/day for 14 days with a 7.5% hydrogen peroxide. For groups 3, 4 and 5, the ascorbate gels were used only once, after the end of the bleaching procedure, for 1 hour. For group 6, the ascorbate gel 40% was used daily. After 24 h, adhesive procedures with Single Bond + Z-250 (3M-ESPE). The specimens were sectioned and bond strengths mensured with universal testing machine (Instron, Modelo 4444, Canton, Ma, EUA). Mean μTBS and standard deviation (SD) in MPa were: G1 - 25.78a (±9.19); G2 - 15.31b (±6.41); G3 - 14.02b (±7.11); G4 - 13.97b (±4.76); G5-20.49ab (±4.64) and G6) 27.11a (±7.83). The use of a 40% sodium ascorbate gel either in a single application (G5) or when used daily (G6) achieved similar bond strengths to that of the non-bleached control group.
Keywords
Tooth bleaching, dentin-bonding agents, hydrogen peroxide
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