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    Evaluation of Bond Strength of Different Repair Methods Applied in PEEK Infrastructure Restorations
    (Sci Printers & Publ Inc, 2021) Yilmaz, Berivan Dundar; Cetinkaya, Numan; Polat, Zelal Seyfioglu; Unal, Server Mutluay; Tuncer, Mehmet Cudi
    OBJECTIVE: To evaluate the appropriate intraoral repair procedures in PEEK (polyetheretherketone) restorations when there is a veneer fracture. STUDY DESIGN: The study groups were formed according to the presence or absence of fractured veneer material of PEEK restorations. PEEK specimens (N = 91) were prepared with CAD/CAM in dimensions of 5 x 5.4 x 13 mm and divided into 13 groups including the positive control group. 5000 thermocyclic was applied to the specimens, and then the repair bond strength (RBS) was made at a speed of 0.5 mm/min. The fracture surfaces of the specimens were examined under a stereomicroscope. SEM, EDX, XRD, AFM, and surface contact angle analyses were performed in terms of roughened surfaces of PEEK (N = 16). One-way ANOVA and independent sample t test were used for data analysis (alpha = 0.05). RESULTS: The efficiency of surface treatment, the roughness and wettability of the acid and Co-Jet groups have increased. Acid etching was found to be the most effective surface treatment. The RBS values of the Super-Bond groups in the repair procedures were found to be higher than the Visio.link group and were statistically significant (p = 0.002). When evaluating failure modes, the mode most encountered among all groups was the mixed mode, and least was the cohesive mode. CONCLUSION: The presence or absence of fractured veneer during the repair of PEEK-based restorations does not affect the values of repair bond strength, and RBS values were also not statistically significant.