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Objectives: To evaluate the influence of dentin pretreatments on the push-out bond strength (POBS) of self-adhesive resin cements (SARCs) to radicular dentin.
Materials And Methods: Two experimental pretreatments (2.5% titanium tetrafluoride (TiF ) and 26% polyacrylic acid (PA)) and two SARCs: Maxcem Elite (MAX) and Calibra Universal (CAL) were used. For each cement, a control group was applied as indicated by the manufacturer. Sixty bovine incisors were restored (n = 10) and subjected to POBS evaluation. Failure mode, adhesive interface and surface morphology were analyzed by a Scanning Electron Microscopy (SEM) and resin infiltration was performed by confocal laser scanning microscopy (CLSM). Data for POBS and CLSM were analyzed by three-way ANOVA and Bonferroni post-hoc (α = 0.05).
Results: For MAX, both experimental pretreatments resulted in increased POBS in the cervical third, and for CAL, only the PA resulted in higher POBS in the cervical third. The most failures occurred between the dentin and the resin cement, except when TiF was applied. For PA, analysis of surface morphology showed open dentinal tubules, while TiF presented particle agglomerates. SEM and CLSM images confirmed presence of resin tags for both pretreatments.
Conclusion: Pretreating radicular dentin with PA and TiF solutions improves the bond strength of SARCs.
Download full-text PDF |
Source |
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http://dx.doi.org/10.1111/jerd.12922 | DOI Listing |
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