Restoration of endodontically treated teeth with major hard tissue loss – bond strength of conventionally and adhesively luted fiber‐reinforced composite posts

Aim To evaluate the influence of the luting system on the pull‐out bond strength of conventionally and adhesively luted fiber‐reinforced composite posts ( FRCP s). Material and methods One hundred extracted bovine teeth ( D i 3) were endodontically treated and randomly assigned to nine test groups and one control group ( n  = 10) according to luting system. After preparing the post cavities (8 mm), the custom‐made FRCP s were inserted using conventional glass‐ionomer cement (Ketac Cem), resin‐reinforced glass‐ionomer cement ( M eron P lus and F uji P lus), self‐adhesive resin cement ( R ely X U nicem and Bis C em), self‐conditioning adhesive and resin cement [ M ultilink P rimer +  M ultilink and A dhe SE  +  DC A ctivator +  M ulti C ore F low, or etch‐and‐rinse adhesive and resin cement ( S eal B ond U ltima +  C ore C em, and L uxa B ond +  L uxa C ore Z ). As a control, custom‐made titanium posts were inserted with K etac C em. After water storage (37°C, 24 h, dark), the pull‐out test was performed, followed by failure mode evaluation. The data were statistically analyzed (α = 0.05) using analysis of variance and the D unnett T 3 post hoc test. Results Luting system type and identity significantly influenced bond strength ( P  < 0.001); the bond strengths of all luting systems except K etac C em, M eron P lus, and B is C em were significantly higher than the control (4.4 ± 1.1 MP a). R ely X U nicem (12.0 ± 3.0 MP a) and LB  +  LCZ (14.8 ± 2.3 MPa) generated the highest bond strengths. The clinical application was demonstrated by restoring a traumatized tooth with extensive coronal destruction and thin root canal walls, using a FRCP combined with direct composite build‐up. Conclusion Luting system selection significantly influenced the bond strength of conventionally and adhesively luted FRCP s to bovine root canal dentin.