الفهرس 
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Abstract
This investigation looked at the adhesive power of various veneering materials, including hybrid ceramics, lithium disilicate, and zirconia, to polyetherketonketon (PEKK).
Thirty (n = 30) pekk discs, each measuring 7x7x4 mm, were used in this experimental study. Each Pekk disc was set in acrylic resin that self-polymerizes. They were split into three main groups (n=10 for each group) based on the kind of veneering materials used: group A includes polyetherketonketon (PEKK) discs with hybrid ceramic veneers, group B includes polyetherketonketon (PEKK) discs with lithium disilicate veneers, and group C includes polyetherketonketon (PEKK) discs with zirconia veneers. The veneering materials were adhered to the surfaces of the pekk specimens using TheraCem TM (universal dual cure self- adhesive resin cement).
For 24 hours before to testing, half of the samples (n=5) in each group were placed in distilled water chambers with 100% humidity and a temperature of 37°C. While the other half (n=5) of each group underwent 10000 cycles of thermocycling between 5 and 55 degrees Celsius.
The specimens were attached to a universal testing machine following the subgrouping of each group and the application of thermo-cycling. To identify the failure mode, the specimens were examined using an optical stereomicroscope at a magnification of 50 x while the shear bond strength (SBS) values of each group were determined.
Results:
Zirconia (BruxZir shaded zirconia) demonstrated a statistically significant increase in shear bond strength when compared to e-max specimens, despite thermocycling. Zirconia had the greatest mean value (27.42) Mpa, followed by hybrid ceramics (Vita Enamic) with 21.22.2 Mpa. In the meantime, e-max 211.5 Mpa experienced the lowest mean value.
After thermocycling, there were substantial differences in the shear bond strengths of the various materials, with E max showing the greatest reduction with the lowest mean value (6.50.8MPa) in comparison to the other two materials (vita enamic 172.2MPa and BruxZir shaded zirconia 15.32.2 MPa).