Abstract: A non-magnetic cobalt based “noble” metal dental alloy is provided. The alloy generally contains at least 25 wt. % palladium, from 15 to 30 wt. % chromium and a balance of cobalt, where to ensure the alloy is non-magnetic the concentration of chromium in the alloy is at least 20 wt. %, or if the concentration of chromium is less than 20 wt. % the combined concentration of chromium, molybdenum, tungsten, niobium, tantalum vanadium and rhenium is greater than 20 wt. %.

Abstract: A dental prosthesis comprising a metal alloy pre-form and a dental porcelain veneer coating the metal alloy, wherein the metal alloy has a composition comprising, in % by weight, about 30-40% Co, 25-40% Ru, 20-40% Cr, and 0-0.

Abstract: A noble alloy suitable for dental purposes that contains cobalt and chromium in addition to ruthenium and optionally gold and/or platinum group elements, and is non-magnetic is provided. In the alloy system cobalt-chromium-ruthenium-gallium it was found that gallium contents above about 10 weight percent may exhibit ferromagnetism upon slow cooling. Ferromagnetism is an undesirable feature for dental prosthesis. Reducing the gallium content below 10%, however, lowers the thermal expansion coefficient of the alloy.

Abstract: Dental prostheses are fabricated as a metallic alloy body by a technique that produces scrap alloy. 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 fabricating 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.

Abstract: A Pd—Ag alloy system that utilizes internal oxidation by including a base metal addition of only Ga is provided. The Pd—Ag—Ga alloy is particularly well-suited for use in porcelain-fused-to-metal (PFM) applications because the alloy does not form a dark oxide upon heating. The high oxygen potential of the material ensures the development of a tenacious chemical bond with the porcelain when used in PFM applications. Moreover, the addition of gallium lowers the liquidus temperature of the alloy to improve castability and strengthens the alloy significantly.

Abstract: A dental prosthesis may be cast and machined from a cobalt-, iron- and/or nickel-chromium base dental alloy comprising at least 25% metal selected from the group consisting of ruthenium, platinum, palladium, iridium, osmium, rhodium, and gold wherein the major portion or at least 15%, whichever is larger, of metal in this group is ruthenium; from 15 to 30% chromium; and a principal balance of metal selected from the group consisting of iron. nickel and cobalt.

Abstract: A silver free high noble dental alloy comprising at least 60 wt. % noble materials, where 40 wt. % of the material is gold; at least 2.5 wt. % gallium, at least about from 2 to 4 wt. % cobalt; and at least from about 0.01 to 0.25 wt. % lithium and/or boron; and a principal balance of palladium is provided. Dental products and methods of manufacturing dental products using such a high noble dental alloys are also provided.

Abstract: A noble alloy comprising at least 25 wt. % palladium; from 15 to 30 wt. % chromium; at least 5 wt. % molybdenum and/or tungsten; and a principal balance of nickel is provided. Dental products and methods of manufacturing dental products using such a nickel-chromium base noble alloy are also provided.

Abstract: A non-magnetic cobalt based “noble” metal dental alloy is provided. The alloy generally contains at least 25 wt. % palladium, from 15 to 30 wt. % chromium and a balance of cobalt, where to ensure the alloy is non-magnetic the concentration of chromium in the alloy is at least 20 wt. %, or if the concentration of chromium is less than 20 wt. % the combined concentration of chromium, molybdenum, tungsten, niobium, tantalum vanadium and rhenium is greater than 20 wt. %.

Abstract: 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.

Abstract: A silverless gold alloy for dental prosthesis comprising 60-70 wt. % gold, 20-30 wt. % palladium, 0-1 wt. % of ruthenium, iridium, rhenium or of a combination thereof, as grain refiner, and the balance to 100 wt. % being indium and gallium.

Abstract: A dental alloy is provided for use in porcelain-fused-to-metal dental restorations, which has an excellent oxide color and which can be cast and recast without deleterious effect, which comprises at least 99.5 wt. % gold, 0.1-0.25 wt. % zinc, 0.1-0.25 wt. % indium and 0-0.3 wt. % total of Rt, Pd, Rh, Ir, Re or combinations thereof.

Abstract: A silverless low gold dental alloy contains, by weight, 10-40% gold; 3-8% gallium; 0.5-10% indium and/or tin; 0.1 to 1.5% ruthenium, or iridium, or rhenium; balance palladium. The alloy is non-staining and bondable to and compatible with porcelain.

Abstract: A thermally stable, non-staining, silver and gold free, palladium-based dental alloy for use with the porcelain fused-to-metal technique, said alloy containing specified minor amounts of cobalt, gallium and ruthenium, iridium or rhenium, and the method for preparing the alloy are disclosed herein.

Abstract: A silverless gold alloy consists of about 50-58% gold, 0.5-10.5% indium, 0.5-8.5% tin or 1.0-3.0% gallium, and the balance palladium. This alloy has physical properties similar to ADA Spec. No. 5 for Type IV dental casting gold alloys; and it may have porcelain fused thereto for making dental prosthetic appliances, with little chance that the porcelain will be stained.

Abstract: A brazing alloy composition is provided for brazing together a ferrous metal part to another part, said alloy comprising about 15% to 30% manganese, about 15% to 30% zinc, 0 to about 10% nickel (e.g. 0.5% to 10%) and the balance essentially copper ranging from about 45% to 65%, the brazed joint produced comprising a ferrous metal part on one side strongly bonded at the interface to another part.