Effect of the Bonding Technique on the Morphology of Dentin/Adhesive Interfaces Bonded with Various Adhesive Systems. SEM Investigation
Efeito da técnica adesiva na morfologia da interface adesivo/dentina de vários sistemas adesivos. Estudo em MEV
Palma-Dibb, R.G.; Esper, H.R.; Ramos, R.P.
Rev. odontol. UNESP, vol.33, n1, p.33-40, 2004
Abstract
This study analyzed, by SEM, the effect of bonding technique on the morphology of dentin/adhesive interfaces of five total-etch (Scotchbond MP, Single Bond, Optibond FL, Stae and Unibond) and one self-etching system (Etch&Prime 3.1). Moist and dry bonding techniques were compared. Eighteen dentin disks were prepared, standardized smear layer was produced and the disks were bisected. The following drying protocols were accomplished: on one half, dentin was kept moist; on the other, dentin was dried. The adhesive systems were applied and a layer of Z250 resin was placed on dentin surface and light-cured. Specimens were sectioned, smoothened and prepared for SEM. The resin-dentin interfaces were analyzed as to the formation of a hybrid layer, focusing on its characteristics and quality. The self-etching system did not produce a consistent hybrid layer, regardless of the bonding technique. The hybrid layers produced by the total-etch adhesives, were always thicker and more homogeneous when the moist technique was performed.
Keywords
Adhesives, dental bonding, scanning electron microscopy
Resumo
Este estudo analisou, em MEV, o efeito da técnica de adesão na morfologia das interfaces adesivas de cinco sistemas total-etch (Scotchbond MP, Single Bond, Optibond FL, Stae, Unibond) e um self-etching (Etch&Prime 3.1). As técnicas úmida e seca foram comparadas. Dezoito discos de dentina foram preparados, smear layer padronizada foi produzida e os discos divididos ao meio. Os seguintes protocolos de secagem foram realizados: num hemi-disco, a dentina foi mantida úmida; no outro foi seca. Os sistemas adesivos foram aplicados e uma camada da resina Z250 foi acomodada na superfície dentinária e polimerizada. Os espécimes foram seccionados, polidos e preparados para MEV. As interfaces resina-dentina foram analisadas quanto à formação de camada híbrida, enfocado suas características e qualidade. O sistema self-etching não foi capaz de produzir uma camada híbrida consistente, independente da técnica de adesão. As camada híbridas produzidas pelos adesivos total-etch, foram mais espessas e homogêneas quando a técnica úmida foi realizada.
Palavras-chave
adesivos, colagem dentária, microscopia eletrônica de varredura
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