Influence of different surface treatments on shear bond strength of polyetheretherketone (peek) to composite resin and chemical cement

The objective of the present study was to evaluate the influence of different surface treatments for polyetheretherketone (PEEK) on the bond strength to a flow composite resin and a chemical cement. PEEK discs (n=132) were polished using sandpapers of grit sizes #600, #1200, and #2000 to standardize the surfaces. PEEK samples were divided into 12 groups (n=11 per group) according to the type of surface treatment: Control - No treatment (CTRL), Sulfuric Acid (SA), Laccase (L), Dopamine (DM), Laccase-catalyzed Dopamine (DM2), Caffeic Acid (CA), DOPA (D), H-Protein A (HP-A), H-protein B (HP-B), Aluminum Oxide Blasting (AOB), Silica Oxide Blasting (C) and Silica Oxide Blasting + Laccase (C+L). Surface roughness, scanning electron microscopy and contact angle were analyzed and then the samples were restored using the Visio.link adhesive system, Beautifil Flow Plus resin and SuperBond cement. Four restorations were made per sample. After 24 hours, bond strength was tested using a universal testing machine at a crosshead speed of 0.5 mm/min, with results reported in MPa. The Shapiro-Wilk normality test was performed for all tests. The roughness and contact angle data were analyzed using Kruskal-Wallis and Bonferroni post-hoc. Data were analyzed using the Shapiro-Wilk normality test. Surface roughness and contact angle data were analyzed using the Kruskal-Wallis test with Bonferroni post-hoc correction, and bond strength data were analyzed using the Wilcoxon test, with significance set at p < 0.05.