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Fiber Post Etching with Hydrogen Peroxide: Effect of Concentration and Application Time

2011; Elsevier BV; Volume: 37; Issue: 3 Linguagem: Inglês

10.1016/j.joen.2010.11.037

1878-3554

Murilo de Sousa Menezes, Ellyne Cavalcanti Queiroz, Paulo Vinícius Soares, André Luis Faria‐e‐Silva, Carlos José Soares, Luís Roberto Marcondes Martins,

Dental Implant Techniques and Outcomes

IntroductionEtching is necessary to expose the fibers and enable both mechanical and chemical bonding of the resin core to the fiber post. This study evaluated the effect of concentration and application time of hydrogen peroxide on the surface topography and bond strength of glass fiber posts to resin cores.MethodsFiber posts were etched with 24% or 50% hydrogen peroxide for 1, 5, or 10 min (n = 10). Posts without any treatment were used as a control. After etching, the posts were silanated and adhesive resin was applied. The posts were positioned into a mold to allow a self-cured resin core to be inserted. The post/resin assembly was serially sectioned into five beams that were subjected to a tensile bond strength test. Data were subjected to two-way ANOVA and Tukey test (α = 0.05). The surface topography was analyzed using scanning electronic microscopy.ResultsNon-etched post presents a relatively smooth surface without fiber exposure. Application of hydrogen peroxide increased the surface roughness and exposed the fibers. All experimental conditions yielded similar bond strength values that were higher than those obtained in the control group.ConclusionBoth 24% and 50% hydrogen peroxide exposure increased the bond strength of resin to the posts, irrespective of the application time.