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    Effect of Er-YAG laser application on shear bond strength of polymethyl methacrylate to Cr-Co Alloy
    (Selçuk Üniversitesi, 2016) Duran, İbrahim; Ural, Çağrı; Sarı, M.Erhan; Yüzbaşıoğlu, Emir; Yılmaz, Betül; Kavut, İdris
    Background: The aim of the present study is to investigate the effect of Er:YAG laser treatment on bond strength between Cr-Co alloy and the acrylic resin. Methods: A total of 36 square-shaped metal alloy test specimens (10x10x3 mm) were prepared. Specimens of each alloy were randomly divided into three treatment groups (n=12). Specimens, left untreated were grouped as control, air abraded with Al2O3 and Er-YAG laser irradiated. Autopolymerized resin discs of 4 mm diameter and 5 mm in height were fabricated and aplicated on alloy specimens. The bonded specimens were stored in distilled water for 24 hours at 37°C in a humidor. They were then mounted in a loading jig and debonded in shear using a universal testing machine at a cross-head speed of 0.05 mm/min. The data were statistically analyzed. Results: Among the three test groups the highest bonding values were obtained in sandblasted test specimens. Although, laser irradiated test specimens showed significantly higher test results compared with control group, they showed lower values than sandblasted test specimens. Conclusion: Laser treatment is not effective as Al2O3 sandblasting for improving bond strength between the alloy and acrylic resin.