Tensile bond strength of dual-cure and self-adhesive resin cements to fiber posts: an in vitro study
Keywords:
Fiber post, dual-cure resin cement, self-adhesive cement, tensile bond strength, intraradicular adhesionAbstract
This study analyzed the tensile bond strength of two resin cementation systems, evaluating whether the technical simplification of self-adhesive cements compromises the bonding force in glass fiber posts. Thirty single-rooted teeth were randomly divided into two groups ($n=15$), which underwent endodontic treatment and post-space preparation after being transversally sectioned. The posts were cemented using a conventional dual-cure adhesive resin system (RelyX™ ARC) and a dual-cure self-adhesive system (RelyX™ Unicem 2 Clicker™), strictly following the manufacturer's protocols. Through universal testing machine assays, it was determined that the conventional adhesive technique cement achieved a higher mean strength ($5.0840$ MPa) compared to the self-adhesive system ($4.2993$ MPa). Statistical analysis using the Mann-Whitney U test confirmed significant differences between both groups ($p < 0.05$), demonstrating that the total-etch and prior bonding protocol of RelyX™ ARC provides superior tensile anchoring capacity. It is concluded that, despite the clinical advantage of simplifying steps, the dual-cure adhesive resin cement offers superior performance in the fixation of intraradicular posts under the evaluated in vitro conditions.
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