Abstract: Objective: To study the effect of different surface treatments on the shear bond strength between PEEK and veneer resin. Methods: One hundred and sixty PEEK samples were prepared and randomly divided into four groups for surface treat: 98% sulfuric acid etching group, adhesive group, 98% sulfuric etching acid + adhesive group, and control group. Each group was divided into two subgroups of different veneering resins: GC Gradia resin and Ceramage resin. Half of each subgroup was randomly selected and immersed in distilled water at 37℃ for 24 h, and the other half was thermocycled 10000 times. The bond strength of samples was measured in a universal testing machine, and then analyzed by ANOVA and SNK-q test in SPSS software. The failure types were assessed by stereomicroscopy. Results: The highest shear bond strength before and after thermocycling was observed for the group treated with sulfured acid and veneering Ceramage resin(P＜0.05). After thermal cycling, all experimental groups showed lower shear bond strength (P＜0.05) except sulfuric acid + adhesive treatment group between PEEK and GC Gradia resin. Conclusion: The treatment with 98％ sulfuric acid etching or the adhesive both can enhance the shear bond strength between PEEK and veneer resin. The bond strength between GC Gradia and PEEK with sulfuric acid + adhesive treatment is more durable.

Key words: Polyetheretherketone, Surface treatment, Veneering resin , Shear bond strength