IADR Abstract Archives
Effect of recasting percentage of base metal alloys on the metal-ceramic bond strength
Objectives: Long-term success of metal ceramic restorations depends on metal ceramic bond. Castability plays an important role in selection of an alloy for casted dental restoration. This study was conducted to assess the effect of recasting of Co-Cr alloys on the bond strength of metal-ceramic.
Methods: 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. The shear bond strength test was performed in a universal testing machine with a crosshead speed of 0.5 mm/min. 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).
Conclusions: There is no statistically difference between the bond strength value of the new alloy and the once casted alloy.
Methods: 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. The shear bond strength test was performed in a universal testing machine with a crosshead speed of 0.5 mm/min. 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).
Conclusions: There is no statistically difference between the bond strength value of the new alloy and the once casted alloy.