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Manipal Journal of Medical Sciences

Abstract

Purpose: The objective is to assess how the bond between metal and ceramic is impacted by recasting the base metal alloy. Materials and Methods: A total of 78 metal-ceramic specimens were created using beryllium-free nickel-chromium alloy from Dentalloy International Pvt Ltd. There were 26 specimens in each of the three groups, and they were all prepared differently. The first group was cast from 100% fresh alloy and served as the control. The second group was made by mixing 50% used (once cast) alloy and 50% fresh alloy. The third group was cast using 100% reused (once-cast) alloy. All of the alloy specimens from the three groups were then bonded to porcelain using VMK 95 Metall Keramik from Vita Zahnfabrik, Bad Sackingen, Germany. After the bonding process, the samples were tested for their shear bond strength. To test the weight percentage of each element, ten fractured specimens from each group were subjected to microanalysis. The bond strength data was analyzed using one-way ANOVA followed by the Tukey multiple comparison test. Results: The study results support the use of once-cast alloys for metal-ceramic restorations. The bond strength of these specimens was found to be significantly higher at 37.67±8.65 MPa as compared to those made from fresh metal (25.43±7.34 MPa). The SEM (scanning electron microscope) images of the fracture surface revealed a mixed mode of failure with visible porcelain fragments and the microstructure analysis of the fractured surfaces showed a remarkable decrease in the oxides of Ni, Cr, Mn, and Mo in the recast specimens. Conclusion: These findings strongly suggest that once-cast alloys can be safely used without compromising the strength of the porcelain-metal bond.

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