Adhesion of Fiber Posts Cemented Using Different Adhesive Approaches

Objectives: The aim of the study was to investigate the adhesion of fiber posts cemented to intraradicular dentin with luting agents that utilize three currently available adhesive approaches: etch-and-rinse, self-etch and self-adhesive. Methods: Thirty five intact human premolars with a single root canal were used in the study. The roots were endodonticaly treated and prepared for the insertion and cementation of the posts. Teeth were randomly divided into five groups (n=7). In each group, different resin cement with its adhesive system (if needed) and fiber post was used. The groups were classified according to the adhesive approach into three categories. 1) Etch-and-rinse groups: Calibra resin cement/XPBond adhesive+Self curing activator(SCA)/RadiX Fiber Post (Dentsply Caulk) and MultiCore Flow luting and core build-up material/Excite DSC adhesive/FRC Postec Plus fiber post (Ivoclar Vivadent). 2) Self-etch group: Panavia F 2.0/ED primer (Kuraray)/RadiX Fiber Post (Dentsply Caulk). 3)Self-adhesive groups: Experimental self-adhesive cement/RadiX Fiber Post (Dentsply Caulk) and RelyX Unicem/RelyX Fiber Post (3M ESPE). The adhesion between the post and root canal walls was assessed with the "thin-slice" push-out test. One-way ANOVA followed by the Tukey test were performed (p<0.05). Results: The type of luting agent significantly influenced the measured push-out strengths (p<0.001; Table 1). Conclusion: The most favourable adhesion was obtained with resin cements that utilize etch-and-rinse adhesives and with two investigated self-adhesive cements. The authors thank Dentsply Caulk for support.

Table 1: Push-out strengths. Numbers are means, values in brackets are standard deviations. Different letters indicate statistically significant differences

Luting agent	Push-out strength [MPa]
Calibra	12.70 (4.33) A
MultiCore Flow	11.14 (3.88) AB
Panavia F 2.0	8.68 (5.29) B
Experimental self-adhesive	10.61 (5.01) AB
RelyX Unicem	12.52 (5.47) A