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KMID : 0362120090310030027
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Journal of Technologic Dentistry
2009 Volume.31 No. 3 p.27 ~ p.34
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The Impacts of the Recasting of Non-precious Metal Alloy for Porcelain Fused to Metal Crowns on Strength
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Chung Hee-Sun
Oh Gyung-Jae
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Abstract
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This study compared and analyzed changes to the mechanical characteristics to nonprecious metal alloy for porcelain fused to metal crowns when it’s repetitively used without the addition of new alloy. Metal samples were made with the Verabond V nonprecious metal alloy. Those samples to measure tensile and yield strength were made in the standardized design(ISO 22674), those to measure bond strength in the format, and those to measure hardness in the format. A ceramic to measure bond strength was made at the center of the metal sample in the length of by using Noritaker Super Porcelain EX-3. Ten samples were prepared for one, three and five repetitions of casting each. The test results were as follows: 1. The more casting was repeated, the more significantly tensile strength dropped. 2. The more casting was repeated, the more significantly yield strength dropped. 3. Repetitive casting didn’t cause significant changes to bond strength. 4. The Vickers hardness significantly fell with increasing repetitions of casting. There were no changes to bond strength observed with the increasing number of repeating casting. But tensile strength, yield strength, and Vickers hardness decreased. Those results indicate that repeated casting can affect durability and that careful attention should be paid by avoiding repetitive use or excessive increase of uses when no new alloy is added.
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KEYWORD
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Recasting, Strength, Bond strength, Tensile strength, Yield strength, Porcelain metal
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