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Volume 20 , Issue 3
May/June 2007

Pages 286288

Effects of Recasting on the Chemical Composition, Microstructure, Microhardness, and Ion Release of 3 Dental Casting Alloys and Titanium

Maria Peraire, MD, PhD / Jordi Martinez-Gomis, DDS, PhD / Josep M. Anglada, MD, PhD / Josep Bizar, DDS, PhD / Juan Salsench, MD, PhD / Francesc J. Gil, PhD

PMID: 17580461

This study evaluated the effects of recasting on high noble, noble, and nickel-based alloys, as well as on titanium. Four specimens of each material were cast and recast 7 times. Chemical composition, microstructure, microhardness, and ion release were determined before and after the first cast and following each recast. Zinc and tin concentrations in the high noble alloy decreased significantly with recasting; consequently, the release of these ions decreased as well. A significant increase in Vickers hardness appeared in the fifth recast in both the high noble alloy and titanium. The noble alloy and the nickel-based alloy demonstrated great stability after 7 recasts. The results suggest not recasting titanium. Int J Prosthodont 2007;20:286288.

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