Influence of surface pretreatment of fiber posts on cement delamination

L.A. Jongsma, C.J. Kleverlaan, A.J. Feilzer

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    Objectives

    To evaluate the influence of post surface pretreatment on the delamination strength of different cements from a prefabricated FRC post tested in a three-point bending test.
    Methods
    Three cements were tested; RelyX Unicem, DC Core Automix, and Panavia F2.0. Per cement, 40 posts (D.T. Light Post Illusion size 3) were divided into four groups; no pretreatment (control), sandblasting, silanization, and sandblasting followed by silanization. A cement layer was applied to the posts using a standardized poly-oxy-methacrylate mold. The specimens were subjected to a three-point bending test recording the initial and catastrophic failure loads. Two-way ANOVA and Tukey post-hoc tests were used to analyze the differences between the variables.
    Results
    At the initial failure load, all specimens demonstrated delamination of the cement layer, therefore initial failure load was defined as delamination strength. With RelyX Unicem, none of the pretreatments showed significant differences. When using Panavia F2.0, silanization (735 ± 51 MPa) resulted in higher initial failure values than sandblasting (600 ± 118 MPa). When DC Core Automix was used, silanization (732 ± 144 MPa) produced significantly higher initial failure values than the no pretreatment group (518 ± 115 MPa) and the combined sandblasting and silanization group (560 ± 223 MPa). Two failure types were observed; cohesive and adhesive failure. In the silanization groups, more cohesive failures were observed for all cements tested.
    Significance
    Especially when non self-adhesive cements are used, silanization of fiber posts has a beneficial effect on cement delamination strength and failure type.

    Original languageEnglish
    Pages (from-to)901-907
    JournalDental Materials
    Volume26
    Issue number9
    DOIs
    Publication statusPublished - 2010

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