Coatings, Vol. 16, Pages 33: Tensile Bond Strength Between Zirconia and PEEK Blocks: A Polymer–Ceramic Adhesive Interface Study

Coatings doi: 10.3390/coatings16010033

Authors:
Bora Akat
Ezgi Su Sarıal
Fehmi Gönüldaş
Mehmet Ali Kılıçarslan

Reliable bonding between zirconia and PEEK surfaces is crucial for ensuring the long-term success of hybrid prosthetic restorations. This study aimed to evaluate the tensile bond strength of zirconia–PEEK specimens prepared using different primer strategies to determine the most effective adhesive protocol. One hundred bonded specimens were divided into four groups (n = 25): control (no primer), zirconia primer (MKZ Primer), PEEK primer (Visio.link), and dual primer application. Specimens underwent sandblasting with 110 µm Al2O3 particles at 2 bar pressure for 15 s, and the PEEK primer was light-cured using a Valo Grand LED curing unit (1000 mW/cm2, 90 s). All samples were bonded using the same universal adhesive and resin cement, and tensile bond strength was measured with a micro-tensile testing device. Data were analyzed using one-way ANOVA and Tukey’s HSD test (α = 0.05). The mean bond strengths were 12.83 MPa (control), 15.05 MPa (zirconia primer), 90.50 MPa (PEEK primer), and 102.09 MPa (dual primer). Application of PEEK primer significantly enhanced adhesion compared to zirconia primer or control (p < 0.001), while dual primer use yielded the highest values, indicating a synergistic effect. These findings suggest that surface-specific priming of both zirconia and PEEK surfaces effectively improves polymer–ceramic bonding performance and may contribute to the clinical durability of hybrid prosthetic restorations.

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