Efeito dos períodos de armazenamento na resistência de união de um
sistema adesivo autocondicionante à dentina bovina

CAVALCANTI, Andrea Nóbrega Cavalcanti; SANTOS-DAROZ, Claudia Batittucci Santos Daroz; VOLTARELLI, Fernanda Regina Voltarelli; LIMA, Adriano Fonseca de Lima; PERIS, Alessandra Rezende Peris; Marchi, G.M.

Original Article

Efeito dos períodos de armazenamento na resistência de união de um sistema adesivo autocondicionante à dentina bovina

Effect of the storage periods on the bond strength of a self-etch system to bovine dentin

CAVALCANTI, Andrea Nóbrega Cavalcanti; SANTOS-DAROZ, Claudia Batittucci Santos Daroz; VOLTARELLI, Fernanda Regina Voltarelli; LIMA, Adriano Fonseca de Lima; PERIS, Alessandra Rezende Peris; Marchi, G.M.

Rev. odontol. UNESP, vol.38, n4, p.222-227, 2009

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Resumo

O objetivo do presente estudo foi avaliar o efeito do armazenamento de dentes bovinos, em diferentes períodos, na resistência de união de um sistema adesivo autocondicionante de dois passos. Para essa avaliação, 40 incisivos bovinos (n = 10) foram armazenados em solução de timol 0,10 g.mL–1 durante os seguintes períodos: 24 horas (controle), 15 dias, um mês e seis meses. Após esses períodos de armazenamento, cada dente foi desgastado até a exposição da dentina superficial, um sistema adesivo autocondicionante (Clearfil SE Bond/Kuraray) foi aplicado e um bloco de resina composta (TPH Spectrum, Dentsply DeTrey) foi confeccionado sobre o substrato dentinário. Os materiais restauradores foram aplicados segundo as instruções do fabricante. Os espécimes foram seccionados a fim de se obterem fatias de 1 mm de espessura e constrições foram realizadas para obtenção do formato de ampulheta com área adesiva de 1 mm2. As fatias foram testadas sob tensão em uma máquina de ensaio universal a uma velocidade de 0,5 mm.min–1 e o padrão de fratura foi analisado em microscopia eletrônica de varredura (MEV). Os seguintes resultados foram obtidos (MPa): 24 horas – 11,73 ± 5,2; 15 dias – 9,66 ± 3,6; 1 mês – 11,01 ± 6,7, e 6 meses – 9,43 ± 4,7. Não foi observada nenhuma diferença estatística significante (ANOVA, p = 0,79). Falhas na interface adesiva foram mais frequentemente observadas. Pode-se concluir que os períodos de armazenamento avaliados não influenciaram a união do sistema adesivo autocondicionante à dentina bovina.

Palavras-chave

Dentina, resistência de união, sistemas adesivos.

Abstract

The aim of this study was evaluate the effect of the storage of bovine teeth in different periods on the microtensile bond strength of a two-step self-etch system. For this, forty bovine incisors (n = 10) were stored in 0.10 g.mL–1 thymol solution during the following periods: 24 hours (control), 15 days, 1 month, and 6 months. After these storage periods, each tooth was flattened until superficial dentin exposure, the bonding system (Clearfil SE Bond/Kuraray) was applied and a composite block (TPH Spectrum, Dentsply DeTrey) was built over the dentin substrate. Restorative materials were used following manufacturer’s instructions. The specimens were sectioned to obtain 1 mm thick slabs, which were trimmed to an hour-glass shape with cross sectional area of 1 mm2. Slabs were tested under tension in a universal testing machine at 0.5 mm.min–1 and their failure mode was analyzed with scanning electron microscopy (SEM). The following results were obtained (MPa): 24 hours - 11.73/5.2; 15 days - 9.66/3.6; 1 month - 11.01/6.7, 6 months - 9.43/4.7. Significant differences among experimental groups were not observed (ANOVA, p = 0.79). Failures within the adhesive interface were the most frequently observed. May be concluded that the storage periods did not influence the bonding of the two-step self-etch system to dentin.1 mm2. Slabs were tested under tension in a universal testing machine at 0.5 mm.min–1 and their failure mode was analyzed with scanning electron microscopy (SEM). The following results were obtained (MPa): 24 hours - 11.73/5.2; 15 days - 9.66/3.6; 1 month - 11.01/6.7, 6 months - 9.43/4.7. Significant differences among experimental groups were not observed (ANOVA, p = 0.79). Failures within the adhesive interface were the most frequently observed. May be concluded that the storage periods did not influence the bonding of the two-step self-etch system to dentin.

Keywords

Dentine, bond strength, adhesive systems

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