Aim: is to assess the bond strength of different veneering materials to polyetherketonketon (PEKK).
Material and Methods: Thirty PEKK discs (n=30) were fabricated from PEKK blanks. According to the kind of the veneering materials used, they were assigned into three major groups: Group A: PEKK discs veneered with hybrid ceramics (Vita Enamic), Group B: PEKK discs veneered with Lithium disilicate (IPS E.max CAD), Group C: PEKK discs veneered with zirconia(BruxZir ) . The surfaces of PEKK specimen in all groups were subjected to sandblasting according to the manufacture instructions. After the surface treatment method had been completed, visio.link was applied to all treated PEKK specimens. The veneering materials in each group were adhered onto the surface of the treated PEKK specimens using universal dual cure self- adhesive resin cement (TheraCem ™). Following the creation of the specimens, thermocycling (5°C to 55°C at 10,000 cycles) was applied to half of each group (n=5) before testing. A universal testing machine was used to assess the shear bond strength, and the failure modes were evaluated using stereomicroscope. Data were collected, tabulated and statistically analyzed.
Results: The highest shear bond strength values were observed for BruxZir shaded zirconia (27.4±2), followed by Vita Enamic and IPS E.max CAD (21.2±2.2& 21±1.5 respectively). After thermocycling, IPS E.max Cad showed a marked decrease in the shear bond strength value (6.5±0.8), followed by BruxZir and Vita Enamic(15.3±2.2, 17±2.2 respectively).
Conclusions: material type and thermo-cycling significantly affected the shear bond strength values of the three veneering materials to PEKK specimens.