Role of post design and cement type in fiber post adaptation and retention

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Background: Apical voids reduce cement thickness uniformity and increase the risk of post dislodgment. This study evaluated the pull-out force, resin cement thickness, and the volume of voids and gaps in the apical third of two fiberglass posts (Exacto and Reforpost) luted with RelyX™ ARC (R-ARC) or RelyX™ U200 (R-U200). Methods: Thirty-two endodontically treated single-rooted teeth were assigned to two post groups (Exacto, Reforpost; n = 16), each subdivided according to the resin cement used (R-ARC or R-U200; n = 8). Micro-CT was used to quantify resin cement thickness and apical voids/gaps. Pull-out testing and failure mode analysis were performed. Voids/gaps and pull-out force were analyzed using two-way ANOVA/Tukey, resin cement thickness with three-way ANOVA/Tukey, and failure mode with chi-square. Conclusions: The parallel-sided serrated post (Reforpost) combined with a self-adhesive dual-cure resin cement (RelyX™ U200) resulted in superior apical adaptation, fewer voids, and higher pull-out strength compared with the smooth tapered post (Exacto) or the conventional cement (RelyX™ ARC). Clinically, selecting a post with better anatomical conformity, together with a self-adhesive resin cement, may enhance post retention and reduce the risk of debonding in endodontically treated teeth.

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