Degradação das interfaces resina-dentina: uma revisão da literatura
Degradation of resin-dentin interfaces: a literature review
Reis, A.F.; Cassoni, A.; Kirihata, M.; Sapata, A.S.P.; Atuí, R.A.F.L.; Pereira, P.N.R.; Giannini, M.
Resumo
Restaurações adesivas vêm sendo amplamente utilizadas em diversos procedimentos odontológicos na atualidade. Diversas pesquisas demonstram uma união satisfatória dos materiais resinosos à dentina, principalmente logo após sua aplicação. No entanto, a efetividade dos procedimentos restauradores adesivos promovida por diferentes protocolos de aplicação tem sido questionada com relação à durabilidade da união ao substrato dentinário. A degradação da união, atribuída principalmente à hidrólise dos componentes resinosos e à digestão enzimática dos constituintes da interface, tem se mostrado mais severa para alguns sistemas adesivos do que para outros. O objetivo desta revisão de literatura foi abordar os possíveis mecanismos de degradação das interfaces resina-dentina obtidas com os diferentes protocolos de aplicação disponíveis atualmente. Foram analisadas as diferentes metodologias para estudar o comportamento das interfaces ao longo do tempo. Os estudos das propriedades físico-mecânicas das interfaces e da nanoinfiltração têm se mostrado ferramentas importantes para estimar a longevidade dos adesivos no meio oral. Os trabalhos mostram que a nanoinfiltração ocorre com diferentes severidades, mas praticamente em todos os adesivos. A maioria dos materiais mostra-se eficiente logo após a sua aplicação; no entanto, o comportamento da união ao longo do tempo ante a presença de água varia consideravelmente. Os adesivos autocondicionantes de passo único são os mais susceptíveis à degradação após armazenagem em água. De acordo com os trabalhos revistos, concluiu-se que a degradação da união está relacionada à hidrofilia dos materiais.
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References
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