Efeito da remoção do colageno na infiltração marginal em restaurações de resina composta utilizando dois sistemas adesivos de frasco unico

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

The aim of this study was to evaluate the effect of collagen removaI on the microleakage of two single-bottle adhesive systems. Forty human third molars were selected and each of them received two preparations on its roots. The roots were randomly assigned to be restored using Prime &Bond 2.1(PB-Dentsply) or Single Bond (SB-3M). One of the cavities in each root was treated with H IND. 3 PO IND. 4 and the other received an additional treatment with 10% sodium hypochlorite (NaOCI) for 60 s before adhesive application for removaI of collagen layer. Four groups were created: G1(PBSH)-PB without NaOCI; G2(PBCH)-PB with NaOCI; G3(SBSH)-SB without NaOCI and G4(SBCH)-SB with NaOCI. All the cavities were restored with Z 100 restorative resin (3M). The specimens were submitted to 5,000 thermal cycles (5-55 °C) and stored in 37°C water for 1 year. After this time the specimens were coated with a varnish except for 1 mm of tooth structure surrounding the restoration and immersed in 2% blue methylene for 4 hours. After rinsing, the restorations were sectioned and two independent observers, using a light microscopy at x45 magnification, scored (0 - 4) the microleakage at the interface between restorative material and tooth. The scores were submitted to Fisher s Exact Test and the results showed that collagen removal reduced significantly the microleakage for Prime &Bond 2.1 and had not effect on microleakage for Single Bond

ASSUNTO(S)

sodium hypochlorite colageno collagen adesivos dentarios microleakage dentin adhesives

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