Binus, S., Koch, A., Petschelt, A., Berthold, C.

To evaluate the influence of the luting system on the pull-out bond strength of conventionally and adhesively luted fiber-reinforced composite posts (FRCPs).

Material and methods
One hundred extracted bovine teeth (Di 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 (8mm), the custom-made FRCPs were inserted using conventional glass-ionomer cement (Ketac Cem), resin-reinforced glass-ionomer cement (Meron Plus and Fuji Plus), self-adhesive resin cement (RelyX Unicem and BisCem), self-conditioning adhesive and resin cement (Multilink Primer + Multilink and AdheSE + DC Activator + MultiCore Flow), or etch-and-rinse adhesive and resin cement (SealBond Ultima + CoreCem, and LuxaBond + LuxaCore Z). As a control, custom-made titanium posts were inserted with Ketac Cem. After water storage (37°C, 24h, dark), the pull-out test was performed, followed by failure mode evaluation. The data were statistically analysed (α=0.05) using analysis of variance and the Dunnett T3 post hoc test.

Luting system type and identity significantly influenced bond strength (P<0.001); the bond strengths of all luting systems except Ketac Cem, MeronPlus and BisCem were significantly higher than the control (4.4 ± 1.1MPa). RelyX Unicem (12.0 ± 3.0MPa) and LB + LCZ (14.8 ± 2.3MPa) generated the highest bond strengths. The clinical application was demonstrated by restoring a traumatised tooth with extensive coronal destruction and thin root canal walls, using an FRCP combined with direct composite build-up.

Luting system selection significantly influenced the bond strength of conventionally and adhesively luted FRCPs to bovine root canal dentin.

Dental Traumatology 2013; 29 (5): 339-354.