Abstract
Aim: The purpose of this study was to evaluate the bond strength and point of failure between ceramic and Nickel-Chromium alloys with various proportions of fresh and recast alloy. Materials and method: Fresh and once recast nickel-chromium alloy were used in various proportions and divided into 5 groups, group A, B, C, D, E with 100%, 75%, 50%, 25% and 0% of fresh alloy respectively with 10 specimens in each group. All the metal specimens were veneered with VMK 95 ceramic and were then subjected to three point bend test and SEM analysis. Results: The values were statistically analyzed using One-way ANOVA and Bonferroni test. One-way ANOVA analysis showed a statistically significant difference (p < 0.001) in metal ceramic bond strength which decreased as the percentage of once recast Nickel-Chromium alloy increased. There was no statistically significant differences between Groups A, B and C but Group D and E showed statistically significant differences when compared with group A. SEM analysis showed, majority of the failure occurred at the metal- ceramic interface. Conclusion: When more than 50% fresh alloy was used in the casting procedure, the bond strength was found to be superior to that when less than 50% of fresh alloy was used. Upto 50% of once recast alloy does not have significant effect on the metal-ceramic bond strength.
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