Impact of Resin Cement and Adhesive Systems on the Bond Strength of Polyetheretherketone Dental Restorations

Abstract

Objective: This study investigated the effect of adhesive systems and resin cements on the shear bond strength (SBS) of poly (ether ether ketone). Materials and Methods: 60 disc-shaped PEEK samples were divided into 2 according to the adhesive system to be applied (n=30): (1) Visio.link; (2) Scotchbond Universal and further divided according to resin cement (n=10): (1) Panavia V5; (2) Panavia SA Universal; (3) Variolink Esthetic cement. Resin cements with a diameter of 3 mm and a height of 2 mm were bonded to the adhesive-applied specimens. After thermal-cycling (5,000x), SBS was measured, and failure types (cohesive, adhesive and mixed) were evaluated. Data were analyzed by two-way ANOVA and Tukey HSD test for pairwise comparisons (p<0.05). Results: No significant differences were found among the adhesives. Variolink Esthetic showed the lowest SBS, followed by Panavia SA Universal and Panavia V5 cement, respectively. Only 21.4% of SBS could be explained by the cement, the interaction of adhesive and cement, or the adhesive. The partial eta-squared values revealed that cement had the highest effect on SBS values (0.244). All the groups showed predominant adhesive failure. Conclusion: Chairside adhesives showed similar bond strength to standard PEEK adhesives, and all the cement were above the minimum acceptable bonding strength according to ISO 10477, but only dual-cure resin cement was clinically acceptable. Therefore, cementation with dual-cure resin cement following the universal adhesive application is a safe bonding procedure that can be applied in the clinic for the cementation of PEEK restorations.