Dental prosthesis method and alloys

A - Human Necessities – 61 – C

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A61C 13/00 (2006.01)

Patent

CA 2482340

Dental prostheses are machined from a metallic body instead of being made by lost wax casting. Suitable gold base alloys have only base metal alloying additions which are more readily oxidized than gold and when combined with the gold can be age hardened. Exemplary metals include titanium, zirconium, yttrium and chromium. Scrap from the machining of a dental prosthesis is melted in air so that the base metals are all oxidized and substantially pure gold is reclaimed for reuse in new alloys.

Des prothèses dentaires sont usinées à partir d'un corps métallique au lieu d'être fabriquées par coulée à cire perdue. Des alliages à base d'or convenables comprennent seulement des additions d'alliage de métal de base qui s'oxydent plus facilement que l'or et, lorsqu'ils sont combinés avec de l'or, ils peuvent être durcis par vieillissement. Les métaux représentatifs comprennent le titane, le zirconium, l'yttrium et le chrome. Les déchets provenant de l'usinage d'une prothèse dentaire sont fondus dans l'air de sorte que les métaux de base soient tous oxydés, ce qui permet de récupérer sensiblement l'or pur et de le réutiliser dans de nouveaux alliages.

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