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Abstract

Objective: To evaluate the influence of post fit and luting system on pull-out force and failure mode of conventionally and adhesively luted fiber-reinforced composite posts (FRCP). Methods: 260 extracted bovine deciduous teeth were randomly assigned to each of the four luting systems (Fuji Plus (FP), RelyX Unicem (RXU), Multilink Primer/Multilink (MLP_ML), LuxaBond/LuxaCore Z (LB_LCZ and three post fits (Congruency (C), medium incongruency (MIC), high incongruency (HIC)) (n=20/group). The teeth were decapitated, root canal treated, embedded and post space was prepared. The FRCPs (Macro-Lock Post sizes 1, 3 and 6) were pretreated and inserted, according to the manufacturer’s instructions. The custom-made titanium-post was inserted with Ketac Cem (control) (n=20). After water storage (24h, 37°C), pull-out test was performed. The data were analyzed using Kolmogorov-Smirnov test (p>0.05), Two-way ANOVA and post-hoc tests (Dunnett T3 with Bonferroni correction) (α=0.05). Failure mode was assessed using a stereomicroscope. Results: The influence of post fit and luting system was statistically significant (p