Adesivos dentinários - correlação entre resistência à tensão adesiva e o grau de penetração dos agentes de união
Dentinal adhesives - correlation between shear bond strength and the penetration degree of the bonding agents
Mello, J.B.; Araújo, M.A.M.; Huhtala, M.F.R.L.; Araújo, R.M.; Machado, M.S.C.
Rev. odontol. UNESP, vol.21, nÚnico, p.233-242, 1992
Resumo
O objetivo da presente pesquisa foi avaliar a resistência a tensão dos adesivos dentinários (Bondlite; ARMD, Scotchbond 2, Prisma Bond 2 e Gluma), associados às resinas compostas (Herculite, Adaptic II P, P-50 e Prisma APH) em 140 amostras de dentes humanos integros. Realizamos, também, uma avaliação em microscopia eletrônica de varredura, nas amostras, após a ruptura da resina composta, para verificar o grau de penetração dos adesivos na dentina. Concluímos que a resistência adesiva variou muito entre os materiais estudados, e que os melhores resultados ficaram por conta da associação ARMD e Herculite. Não verificamos correlação entre o grau de penetração do adesivo nos túbulos dentinários e a resistência à tensão adesiva. Notamos, também, que a espessura do smear layer dificulta a difusão e a união dos adesivos à dentina.
Palavras-chave
Adesivos dentinários, resina composta, dentina
Abstract
Thepurpose of this investigation was to determine the shearbond strength of the following dentinal adhesives: Bondlite, ARMD, Scotchbond 2, Prisma Bond 2 and Gluma, in association with the composite resins: Herculite II P, P-50 and Prisma APH, in a 140 human teeth. It was also performed an evaluation of the specimens in the scanning electron microscope, after the fracture of the resin, to identify the adhesives penetration degree into dentin. It was found that the shear bond strength values varied much among the studied systeins; and the best results obtained were when ARMDand Herculite were associated. The present study did not show any correlation between the dentin bonding agent penetration degree into the dentinal tubuli and its shear bond strength. It was noted that the smear layer thickness turned the infiltration and the bonding of the adhesive to the dentin difficult.
Keywords
Adhesive, composite resins, dentin, bonding
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