Dental Prosthesis: An Evaluation
on Mechanical Properties of
Recast Base Metal Alloys
R. Prabhu, MDS
Reader, Dept. of Prosthodontics,
Thai Moogambigai Dental College and Hospital,
Mogappair, Chennai-600 107
Introduction: Dental casting alloys have found widespread usage in restorative dentistry owing to their physical, biological and economical properties. Recent technologies have been applied to these alloys to improve their utility, longevity and efficiency.
Purpose of the Study: The current study aimed at evaluation of recast base metal nickel-chromium alloy with or without addition of new alloy based on their mechanical properties.
Materials and Methods: The study evaluated 10 samples each of fresh alloy, recast alloy with addition of 50% of wt. of new alloy and recast alloy without addition of new alloy. Samples were subjected to computerized Universal Testing Machine and mechanical properties viz. tensile strength, yield strength, percentage of elongation, modulus of elasticity and microhardness was tabulated. Data was subjected to multiple posthoc test of significance.
Results: Significant changes were observed in recast alloy with and without addition of new alloy in contrast to fresh alloy. Conclusion: Recast alloys used in fixed dental prostheses without addition of new alloy show degenerative changes when compared to unused alloys after casting.