Restoration of endodontically treated teeth with major hard tissue loss – influence of post surface design on pull‐out bond strength of fiber‐reinforced composite posts

Aim The aim was to evaluate the influence of post surface design and luting system on bond strength of quartz‐fiber‐reinforced composite posts ( QFRCP s) luted to root canal dentin. Materials and methods Single‐rooted bovine teeth ( n  = 650) were randomly assigned (13 groups, n  = 50), sectioned, endodontically treated, filled, and post space (length 8 mm) prepared. Custom‐made plain‐surfaced fiber posts ( PSXRO ) and (both RTD ) macroretentive Macro‐Lock Post Illusion X‐ RO ( MLXRO ) were inserted into the post spaces using six luting systems: Ketac Cem (KC), Fuji Plus (FP), RelyX Unicem, Multilink Primer_Multilink, Sealbond Ultima_CoreCem, and LuxaBond_LuxaCore Z. As control, a titanium post was cemented with KC. After water storage (24 h, 37°C), pull‐out test was performed, followed by failure mode assessment. Bond strength was calculated in MP a and analyzed using anova , Dunnett‐T3‐test, and Student's t ‐test with Bonferroni correction. Results Post design and luting system significantly influenced the bond strength [ MP a] ( P  < 0.05). Compared with the control 4.3 (1.5), all test groups exhibited higher bond strengths ( P  < 0.05), except for group PSXRO /KC 4.2 (1.0). The remaining bond strengths were PSXRO : FP 8.6 (1.5), RelyX Unicem 10.4 (3.4), Multilink Primer_Multilink 12.7 (3.0), SealBond Ultima_CoreCem 12.7 (3.0), LuxaBond_LuxaCore Z 15.7 (2.5), and MLXRO : KC 7.2 (2.2), FP 13.4 (2.5), RelyX Unicem 9.2 (2.9), Multilink Primer_Multilink 12.5 (4.5), SealBond Ultima_CoreCem 13.7 (4.6), LuxaBond_LuxaCore Z 20.6 (2.2). The bond strengths of MLXRO were higher than those of PSXRO when luted with KC, FP, and LuxaBond_LuxaCore Z ( P  < 0.05). Conclusion The post surface design and luting system selection influenced the bond strength of conventionally and adhesively luted QFRCP s to bovine root canal dentin.