Effect of recasting percentage of base metal alloys on the metal-ceramic bond strength
Makaleler > Tam Makale · 2017
Yazarlar: Ayşe Gözde Türk
Yeditepe Dental Journal, Uluslararası, 2017, cilt 13, ss 51-54
DOI: 10.5505/yeditepe.2017.69885
Özet
Aim: Long-term success of metal ceramic restorations depends on metal ceramic bond.Recasting has been generally used for casted dental restorations in laboratories for economic reasons.This study was conducted to assess the effect of recasting percentage of Co-Cr alloys on the bond strength of metal-ceramic.Materials and Method: Different percentage combinations of new and once casted alloy were used to manufacture a total of fifty metal-ceramic samples for five groups (n=10).Metal discs (5 mm high-5 mm in diameter) were casted from 100% new alloy (G1), 75% new-25% once casted alloy (G2), 50% new-50% once casted alloy (G3), 25% new-75% once casted alloy (G4), 100% once casted alloy (G5).Opaque and dentin ceramics (4 mm high-4 mm in diameter) were fired on the metal samples.Metal-ceramic samples were thermo cycled (5-55 °C, 5000 cycles), with a dwell time of 20 s and a 10 s transfer time.The shear bond strength test was performed in a universal testing machine (Shimadzu) with a crosshead speed of 0.5 mm/min.Failure types were examined with a streomicroscope (X20).The data were analyzed with one-way ANOVA and the Tukey HSD test (p=0.05).Results: The mean bond strengths (MPa) were; 80.67 for G1, 85.69 for G2, 81.25 for G3, 80.46 for G4, and 81.74 for G5.No significant difference was found between the groups (p>0.005).Cohesive failure types were seen for all groups.Conclusion: Different percentages of new alloy and once casted alloy had similar bond strength values.