Effect of Heat‐Pressing Technique and Adhesive Systems on the Bond Strength of PEEK Abutments With Titanium and Chromium–Cobalt Bases

OBJECTIVE: This study aimed to evaluate the tensile bond strength of polyetheretherketone (PEEK) hybrid abutments bonded to titanium (Ti) and chromium-cobalt (Cr-Co) bases using two adhesive systems or the heat-pressing technique. MATERIALS AND METHODS: Ninety PEEK abutments were fabricated using titanium or cobalt-chromium bases: 60 milled from BioHPP blocks and cemented with MKZ Primer-DTK or Monobond Plus-Multilink Hybrid (n = 15) and 30 produced by heat-pressing technique. Tensile bond strength was measured and failure modes were evaluated under a stereomicroscope. Statistical analysis was performed using two-way robust ANOVA with Bonferroni correction (α = 0.05). RESULTS: Both the bonding method and the interaction between method and base materials had a statistically significant effect on bond strength (p < 0.001). The heat-pressing technique resulted in higher bond strength than the resin cement groups (p < 0.001). The highest bond strength was observed in the Cr-Co heat-pressed group (124 MPa) (p < 0.001). All failures in the cemented groups were adhesive type. In the Cr-Co heat-pressed group, failures were cohesive and mixed. In the titanium heat-pressed group, failures were adhesive and mixed. CONCLUSION: The heat-pressing technique significantly improved the bond strength of PEEK abutments compared with resin cementation. Cr-Co bases also demonstrated favorable bonding with PEEK using the heat-pressing technique. CLINICAL SIGNIFICANCE: The heat-pressing technique improved the bond strength of PEEK abutments to titanium and cobalt-chromium bases.