Alloy Patents (Class 433/207)
  • Patent number: 8641418
    Abstract: A method of forming an implant to be implanted into living bone is disclosed. The method comprises the act of roughening at least a portion of the implant surface to produce a microscale roughened surface. The method further comprises the act of immersing the microscale roughened surface into a solution containing hydrogen peroxide and a basic solution to produce a nanoscale roughened surface consisting of nanopitting superimposed on the microscale roughened surface. The nanoscale roughened surface has a property that promotes osseointegration.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: February 4, 2014
    Assignee: Biomet 3I, LLC
    Inventors: Robert L. Mayfield, Ross W. Towse
  • Publication number: 20130273501
    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.
    Type: Application
    Filed: April 11, 2013
    Publication date: October 17, 2013
    Applicant: The Argen Corporation
    Inventors: Paul J. Cascone, Arun Prasad
  • Publication number: 20120196244
    Abstract: A dental article includes yttria stabilized tetragonal zirconia polycrystalline ceramic, and no more than about 0.15 wt. % of one or more coloring agents of one or more of: Pr, Tb, Cr, Nd, Co, oxides thereof, and combinations thereof, whereby the dental article is provided with a color corresponding to a natural tooth shade; and wherein the dental article has a flexural strength of at least about 800 MPa. Corresponding methods are also described.
    Type: Application
    Filed: April 3, 2012
    Publication date: August 2, 2012
    Inventors: Ajmal Khan, Carlino Panzera, Dmitri G. Brodkin
  • Publication number: 20090053676
    Abstract: A gold-plated, full porcelain-coverage crown and a method to create that crown. The crown may be formed from a metallic coping mimicking the shape of the human tooth, such as one made from a nickel-chromium alloy. The intaglio of the crown is plated in gold. The exterior of the crown is covered in a ceramic material such as porcelain, and the interior of the crown or intaglio is plated in gold, and together this prevents exposure of the metallic alloy to the patient's mouth. The crown may be used for patients with an allergy to alloys such as nickel-chromium. Additionally, the crown is useful because it is affordable, contains only a small amount of gold, and is aesthetically pleasing.
    Type: Application
    Filed: August 23, 2007
    Publication date: February 26, 2009
    Inventor: William McCormick
  • Patent number: 7491361
    Abstract: A burning-on alloy for the production of ceramically veneered dental restorations, containing: cobalt 55-65 percent by weight, chromium 20-30 percent by weight, tungsten and/or where the sum of the content by weight molybdenum of molybdenum and half the content by weight of tungsten is in the range of 4-12 percent by weight, gallium 2-4 percent by weight, silicon 0-2 percent by weight, manganese 0.05-1.9 percent by weight, nitrogen 0-0.4 percent by weight, carbon 0-0.02 percent by weight, vanadium, niobium, in total 0-5 percent by weight, tantalum, iron, titanium, zirconium, hafnium nickel 0-0.1 percent by weight, rhenium, gold, in total 0-0.09 percent by weight, silver, copper other metals, 0-1 percent by weight, semi-metals and impurities where the percent by weight data are in each case based on the total weight of the alloy, is described.
    Type: Grant
    Filed: February 16, 2006
    Date of Patent: February 17, 2009
    Assignee: BEGO Bremer Goldschlägerei Wilh. Herbst GmbH & Co. KG
    Inventor: Roland Strietzel
  • Publication number: 20080193900
    Abstract: A ceramo-ceramic dental prosthesis is made from a patient's negative mandibular impression, including at least one working cavity having an inner surface matching the lower surface of the prosthesis to be produced and left at least by one tooth primed by the dental surgeon to be prosthetized. The method of making the prosthesis includes a step of providing a single-unit wax model used for producing by precision casting a single-unit metal model on which is mounted, by the dental technician, a ceramic, the single-unit model having previously been coated with a stripping product to avoid the adherence of the ceramic on the metal single-unit model after the ceramic is cured on the single-unit metal model.
    Type: Application
    Filed: March 31, 2006
    Publication date: August 14, 2008
    Inventor: Germinal Veyrat
  • Patent number: 7041251
    Abstract: To improve the fracture resistance of a dental casting alloy without giving rise to undue hardness thereof it is proposed that the dental casting alloy substantially consists of 28–34 wt % Cr, 5–9 wt % Mo, 1–3 wt % W, 0.9–1.3 wt % Si, 0.15–0.3? wt % Mn, 0.1–0.3 wt % N, 0.1–0.3 wt % C, <0.1 wt % Ni, manufacturing impurities, remainder cobalt, the ratio of the content of Mo to that of W being in the range of from about 3:1 to about 5:1 and the ratio of the content of Si to that of Mn being in the range of from about 3:1 to about 9:1.
    Type: Grant
    Filed: June 12, 2003
    Date of Patent: May 9, 2006
    Assignee: Dentaurum J.P. Winkelstroeter KG
    Inventor: Juergen Lindigkeit
  • Patent number: 6994550
    Abstract: A coating for a biomedical device is disclosed, including a metal layer and/or a ceramic layer, such as a layer of titanium (Ti) and a layer of titanium-nitride (TiN). The coating can form a coping for a crown for a tooth, the crown including a porcelain layer bonded to the titanium-nitride (TiN) layer. Methods for making and using a biomedical device are also disclosed, including vapor deposition of metal and/or ceramic layers, such as titanium (Ti) and titanium-nitride (TiN) layers. In one embodiment, the method includes forming a titanium (Ti) vapor that solidifies to form a titanium (Ti) layer; forming a titanium-nitride (TiN) vapor that coats the titanium (Ti) layer with a titanium-nitride (TiN) layer; and forming a porcelain layer on the titanium-nitride (TiN) layer. The porcelain can be sintered to form a dental crown or other device.
    Type: Grant
    Filed: July 17, 2003
    Date of Patent: February 7, 2006
    Assignee: Nano-Write Corporation
    Inventors: Kenneth E. Knapp, Michael L. Hedrick
  • Patent number: 6626672
    Abstract: An alloy and method is disclosed for forming an improved dental prosthesis. The invention relates to a dental material of a precious metal composition and a method for infiltrating one alloy with another to produce a substructure for ceramic prosthetic restorations for damaged or missing teeth or metal replacements for same.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: September 30, 2003
    Inventor: Larry C. Been
  • Patent number: 6613273
    Abstract: Dental restorations are fabricated using metal powder. Preferably, the metal powder is a high fusing metal and preferably, the metal powder comprises a non-oxidizing metal. The metal powder is applied to a die and is covered with a covering material such as a refractory die material preferably in the form of a flowable paste. A second covering material may be sprinkled or dusted onto the paste. The model is then dried prior to firing. After drying, the model is sintered to provide a high strength metal restoration. After sintering, the outer shell can be broken off easily with one's hand to expose the sintered coping.
    Type: Grant
    Filed: January 10, 2001
    Date of Patent: September 2, 2003
    Assignee: Jeneric/Pentron Incorporated
    Inventors: Gregg Daskalon, Arun Prasad, Denise L. North, Elie Zammarieh
  • Publication number: 20030096214
    Abstract: The invention is based on the object of providing a method to produce a tooth restoration, in particular a tight-fitting ceramic tooth restoration, in which under avoidance of a hard-worked ceramic material and with a minimum of method steps, the outer shape of the ceramic tooth restoration being in opposition to the buccal cavity including the gradually thinning down restoration edge is manufactured in its final shape, whereby the sintering shrinkage is being taken into consideration.
    Type: Application
    Filed: November 5, 2002
    Publication date: May 22, 2003
    Inventors: Ralph Gunnar Luthardt, Volker Herold, Martina Johannes, Olaf Sandkuhl
  • Publication number: 20020187458
    Abstract: In a method for forming a dental part, a laser beam is guided over a powder layer of biocompatible material. The laser is guided by a computer controlled laser scanning system based on data representing the shape of cross-section through the shaped body. The powder is substantially melted by the laser beam to form a layer in the shaped body, to build the shaped body entirely from layers of laser-melted material.
    Type: Application
    Filed: May 14, 2002
    Publication date: December 12, 2002
    Applicant: BEGO Bremer Goldschlagerei Wilh. Herbst GMBH & Co.
    Inventors: Haig Dolabdjian, Roland Strietzel
  • Patent number: 6426149
    Abstract: A ceramic structure where a gold foil or a platinum foil having a high purity is enclosed between a first layer made of a ceramic material fused at a medium temperature or a glass material (glass substance) and a second layer made of a ceramic material fused at a low temperature and/or a glaze material, or made of a glaze material or fritting glass material. Since such a ceramic structure is light in weight and has excellent durability, the final product can be preferably applied to fashion accessories, ornaments on artificial teeth.
    Type: Grant
    Filed: September 2, 1997
    Date of Patent: July 30, 2002
    Inventor: Akitoshi Machida
  • Patent number: 6290501
    Abstract: The invention relates to silver-palladium alloys for the manufacture of dental prostheses which can be faced with dental ceramic. Because of selected contents of the alloy elements indium, tin and zinc, these cause no discolorations when combined with low-melting dental ceramic with a coefficient of thermal expansion of approx. 16.5 &mgr;m/mK.
    Type: Grant
    Filed: December 2, 1999
    Date of Patent: September 18, 2001
    Assignee: Degussa-Huls Aktiengesellschaft
    Inventors: Franz Josef Grau, Joseph Maria Van Der Zel
  • Publication number: 20010012491
    Abstract: What is proposed is a non-precious alloy with a cobalt-chrome or nickel-chrome base containing 30-70% nickel and/or cobalt, 20-35% chrome and 3-25%, in particular 12-15% manganese and/or iron. With such an alloy as casting material, it is possible to make dental products such as crowns, bridges, inlays and the like that can be ceramically veneered without problems arising as a result of different coefficients of thermal expansion.
    Type: Application
    Filed: January 10, 2001
    Publication date: August 9, 2001
    Inventor: Roland Dieter Strietzel
  • Patent number: 6213776
    Abstract: A bonding material for joining a polymeric veneering material or porcelain ceramic to a metal framework of a dental restoration or dental prosthesis before sintering the porcelain at a suitable temperature to form a clinically unbreakable structure. The bonding material is composed of finely divided metal particles including at least 50% gold or a gold alloy as its major constituent and finely divided particles of a carbonaceous material preferably of activated carbon.
    Type: Grant
    Filed: March 28, 2000
    Date of Patent: April 10, 2001
    Inventors: Itzhak Shoher, Aharon Whiteman
  • Patent number: 6103383
    Abstract: A new nickel-chromium alloy having high rigidity, castability, corrosion and oxidation resistance and easy workability is disclosed. The alloy comprises from about 45 to 81% nickel by weight, from about 13 to 25% chromium by weight, from about 3 to 15% tungsten by weight, and silicon and aluminum in the range from about 1 to about 6% by weight each. The new alloy has a high concentration of tungsten.
    Type: Grant
    Filed: January 27, 1998
    Date of Patent: August 15, 2000
    Assignee: Jeneric/Pentron Incorporated
    Inventor: Arun Prasad
  • Patent number: 5922276
    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.
    Type: Grant
    Filed: February 17, 1998
    Date of Patent: July 13, 1999
    Assignee: The Argen Corporation
    Inventor: Paul J. Cascone
  • Patent number: 5853661
    Abstract: A high gold content dental alloy comprises, on a weight basis, 91 to 99.4% of gold, 0.5 to 3% of at least one metal selected from titanium and tantalum, up to 5% of silver, 0.05 to 1% of iridium and/or tungsten, and up to 1% at least one element selected from the group comprising rhodium, ruthenium, platinum, osmium, iron, molybdenum, niobium and rhenium.
    Type: Grant
    Filed: December 24, 1996
    Date of Patent: December 29, 1998
    Assignee: Cendres ET Metaux SA
    Inventor: Jens Fischer
  • Patent number: 5852248
    Abstract: Shaped article replicas which are proportionately accurate replicas of a shaped article and which are equal, greater or smaller in size than said shaped article are made by preparing a swellable polymer cavity mold from said shaped article; immersing said swellable polymer cavity mold in a swelling agent system under conditions which will enlarge said cavity mold to a predetermined extent; forming a powder compact in said casting mold or a replica thereof and heating said powder compact to produced a proportionately accurate solid replica of a predetermined size.
    Type: Grant
    Filed: May 21, 1998
    Date of Patent: December 22, 1998
    Assignee: Den-Mat Corporation
    Inventor: Thomas Chadwick
  • Patent number: 5849417
    Abstract: Implantation materials for the living body comprising: 10 to 4000 ppm of gaseous ingredients combined, mainly composed of oxygen; up to 100 ppm of ingredients other than the gaseous ingredients such as iron; and the balance titanium. An oxide film is formed on the surface, where necessary, by anodizing or the like. Titanium fixation wires for implanting in the living body composing: up to 300 ppm oxygen, up to 50 ppm hydrogen, up to 200 ppm nitrogen, and up to 400 ppm carbon, all as gaseous ingredients; up to 100 ppm of ingredients other than the gaseous ingredients such as iron; and the balance titanium. For applications where strength is the primary consideration, the wires comprise: from more than 100 to 1000 ppm of iron; up to 250 ppm oxygen, up to 50 ppm hydrogen, up to 170 ppm nitrogen, and up to 400 ppm carbon, all as gaseous ingredients; up to 100 ppm of iron and ingredients other than the gaseous ingredients; and the balance titanium.
    Type: Grant
    Filed: September 11, 1995
    Date of Patent: December 15, 1998
    Assignee: Japan Energy Corporation
    Inventors: Susumu Sawada, Tateo Ohhashi, Ichiro Sawamura, Toshiaki Shimada
  • Patent number: 5833462
    Abstract: Precision attachments containing a titanium-containing gold alloy which is covered with a gold film, capable of being cast on, which have a golden yellow color, are extremely corrosion-resistant and, despite base metal constituents, form no oxides at the place of casting-on.
    Type: Grant
    Filed: February 23, 1996
    Date of Patent: November 10, 1998
    Assignee: Degussa Aktiengesellschaft
    Inventors: Bernd Kempf, Hans Martin Ringelstein, Alexander Voelcker, Ulrich Birkholz
  • Patent number: 5695714
    Abstract: Gold-palladium alloys with a high gold content for dental applications should, for reasons of biocompatibility, not contain any toxically dubious components. For particularly corrosion-resistant and biocompatible Type 4 alloys, tin is needed as the only base-metal component in amounts between 0.7 and 5.8 wt % if one remains within defined limits in a palladium-tin diagram of FIG. 1, for Pt values less than 2%. Such alloys contain, in addition to gold and tin, 6 to 25 wt % palladium, 0 to 12 wt % platinum and 0 to 2 wt % of at least one of iridium, rhodium and/or ruthenium.
    Type: Grant
    Filed: July 20, 1994
    Date of Patent: December 9, 1997
    Assignee: Degussa Aktiengesellschaft
    Inventors: Bernd Kempf, Doris Hathaway, Gernot Schoeck, Hans-Martin Ringelstein, Bernd Meier
  • Patent number: 5516355
    Abstract: The invention relates to a method of preparing a dental amalgam that is devoid of harmful free mercury, to be used as a filler for dental cavities. In particular the invention relates to processes by which two separate compositions characterized as treated silver and silver-mercury compound are formed, which are then used in a mixture with mercury to form the dental amalgam.
    Type: Grant
    Filed: November 21, 1994
    Date of Patent: May 14, 1996
    Inventor: Subramaniam Radhakrishnan
  • Patent number: 5462437
    Abstract: A dental alloy is provided which is compatible with a wide variety of composites and porcelain compositions. The alloy has a melting range of between about C. and C. and a coefficient of thermal expansion of between 15.5.times.10.sup.-6 and 17.5.times.10.sup.-6 in/in/.degree. C. when heated from room temperature to C. The alloy contains between one and 85 percent by weight gold, between two and 65 percent by weight of a thermal expansion adjuster, between 0.25 and 34 percent by weight of a strengthener and oxide former, up to about one percent by weight grain refiner, and up to about 0.25 percent by weight deoxidizer.
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: October 31, 1995
    Assignee: Jeneric/Pentron Incorporated
    Inventors: Arun Prasad, Martin Schulman
  • Patent number: 5453290
    Abstract: A system for dental restorations comprising dental alloys for the manufacture of a substructure of the restoration and dental porcelains for coating the substructure. The porcelains have a relatively high thermal expansion coefficient, above 14.5 .mu.m/, and a relatively low firing temperature, below C. The alloys have adapted properties, a thermal expansion coefficient above 14.5 .mu.m/ and a solidus temperature of at least C.
    Type: Grant
    Filed: November 16, 1993
    Date of Patent: September 26, 1995
    Assignee: Elephant Edelmetaal B.V.
    Inventor: Joseph M. van der Zel
  • Patent number: 5431875
    Abstract: A precious metal alloy for dental restorations which develops a light oxide upon firing, on a percentage weight basis at makeup, consists of 60-95 precious metal(s) selected from the group consisting of 60-855 palladium, 0-10 gold, 0-10 platinum, 0-12 silver, and mixtures thereof; 1-15 tin; 2-7 zinc; 0.005-0.2 boron; 0-2 gallium; 0-2 cobalt; 0-15 indium; 0-0.2 of a deoxidant selected from the group consisting of silicon, germanium, magnesium, aluminum, lithium, tantalum and mixtures thereof; and 0-1.0 of a grain refiner selected from the group consisting of ruthenium, iridium, rhenium, and mixtures thereof. The alloy has a liquidus temperature of not more than C., and the alloy has a tensile yield strength of at least 250 Mpa and an elongation of at least 2 percent. Restorations having a porcelain coating fired on castings of the alloy evidence a light oxide color.
    Type: Grant
    Filed: May 2, 1994
    Date of Patent: July 11, 1995
    Assignee: The J. M. Ney Company
    Inventors: Thomas B. Cameron, Edward F. Smith, III
  • Patent number: 5423680
    Abstract: A dental alloy is provided which is free of palladium, gallium and copper and which is compatible with a wide variety of composites and porcelain compositions. The alloy has a melting range of between about C. and C. and a coefficient of thermal expansion of between 15.5.times.10.sup.-6 and 17.5.times.10.sup.-6 in/in/.degree. C. when heated from room temperature to C. The alloy contains between about 40 and 80 percent by weight gold, between 5 and 50 percent by weight of thermal expansion adjuster, between two and 15 percent by weight strengthener and oxide former, up to about 1.5 percent by weight grain refiner, and up to about 0.25 percent by weight deoxidizer.
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: June 13, 1995
    Assignee: Jeneric/Pentron, Incorporated
    Inventor: Arun Prasad
  • Patent number: 5362438
    Abstract: This invention relates to a powder substantially of dental metal, which powder is suitable for the manufacture of a dental restoration such as a crown or a bridge, comprising a substructure of dental metal and a fired on coating of a dental ceramic material. The powder comprises a core substantially of a dental metal, which core is coated with one or more layers substantially of metal which protect the dental metal of the core during sintering against oxidation and/or reduce the temperature at which the powder is sintered.The invention also relates to a process for the manufacture of a dental restoration such as a crown or a bridge, comprising a substructure of a dental metal and a fired on coating of a dental ceramic material.
    Type: Grant
    Filed: June 10, 1993
    Date of Patent: November 8, 1994
    Assignee: Elephant Edelmetaal B.V.
    Inventor: Joseph M. van der Zel
  • Patent number: 5338378
    Abstract: A dental gold alloy which is soft enough for adjustment of a patient's occlusal condition, which is age-hardenable with passage of time at temperatures encountered within a patient's oral cavity, and which has a single phase structure which imparts improved corrosion resistance, the dental gold alloy consisting essentially of 82-67% by a weight of gold; 18-33% by weight of copper; and 2-8 at % of an age-hardening accelerator which is at least one metal selected from the group consisting of gallium, aluminum and zinc, wherein the dental gold alloy has been subjected to a solution treatment by heating at C. and quenching into water.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: August 16, 1994
    Assignee: Kyushu University
    Inventors: Michio Ohta, Shigeki Matsuya, Takanobu Shiraishi, Masaharu Nakagawa
  • Patent number: 5314109
    Abstract: A method of joining orthodontic appliances or dental appliances by brazing with an alloy material containing at least about 50% by weight silver and at least about 20% by weight gold.
    Type: Grant
    Filed: April 26, 1993
    Date of Patent: May 24, 1994
    Assignee: Ormco Corporation
    Inventor: Farrokh Farzin-Nia
  • Patent number: 5227131
    Abstract: A metal alloy for cast prosthetic frames in dentistry, consisting of (in % by weight)______________________________________ 0.1 to 0.3 % C up to 1.5 % Si up to 3 % Mn 25 to 35 % Cr 3 to 6.5 % Mo 0.5 to 5 % Ta 0.15 to 0.40 % N ______________________________________remainder cobalt and residual impurities.
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: July 13, 1993
    Assignee: Thyssen Stahl Aktiengesellschaft
    Inventor: Hans-Hermann Weigand
  • Patent number: 5221207
    Abstract: A yellow dental alloy is disclosed with high gold content for castings and ceramic veneers with an adjusted thermal expansion coefficient that does not produce any undesirable discoloration of the ceramic veneers and that is very hard. It contains 70 to 85% by weight gold, 5 to 13% by weight silver, 2 to 9% by weight platinum, 0 to 4.5% by weight palladium, 0.05 to 1% by weight iridium, rhenium, rhodium and/or ruthenium, 2 to 8% by weight copper, 0.1 to 6% by weight indium, zinc and/or germanium, and 0 to 4% by weight gallium, iron and/or tungsten.
    Type: Grant
    Filed: October 2, 1991
    Date of Patent: June 22, 1993
    Assignee: Degussa Aktiengesellschaft
    Inventors: Gernot Schoeck, Bernd Kempf, Werner Groll
  • Patent number: 5186626
    Abstract: A dental prosthetic device is provided comprising a coping adapted to be placed on at least one abutment tooth to an edentulous region. A pontic metal substructure adapted to be joined to the coping and a ceramic buildup to fill the edentulous region are also provided. Also provided are metal-porcelain dental restorations which can be made in a two-layer or three-layer structure. The first layer closely fits the contours of the abutment teeth and ceramic and the additional layer complete the restoration. One or both of the other layers may be stainless steel mesh.
    Type: Grant
    Filed: May 22, 1991
    Date of Patent: February 16, 1993
    Assignee: Asami Tanaka Dental Enterprises
    Inventor: Asami Tanaka
  • Patent number: 5174954
    Abstract: The present invention relates to alloys containing about 50-90% palladium, 0-37% gold, 0-3% platinum, 0-35% silver, 0.5-8% gallium, 0-8% tin, and up to 0.2% of a grain refiner selected from the group consisting of iridium, rhenium and ruthenium, or mixtures thereof. In order to withstand the forces of mastication over long spans or cantilever sections, the alloys are more rigid than conventional palladium based alloys. The alloys may be utilized for conventional crown and bridgework or may be fabricated into a number of different prostheses for use on dental implants. These applications include, for example, metal base plates for dentures, metal retaining bars for removable or fixed removable dentures, full metal coverage crowns and bridges, and metal substructures to be veneered with resin or porcelain materials.
    Type: Grant
    Filed: March 1, 1991
    Date of Patent: December 29, 1992
    Assignee: Ivoclar N.A.
    Inventors: Stephen P. Schaffer, Patrick J. McCabe, Bernt-Roger Gustafsson
  • Patent number: 5143692
    Abstract: A method of making a substructure for a dental restoration which comprises a substructure of a dental metal and a fired on coating of a dental ceramics, which method comprises applying a powder-form mixture of a dental metal powder and a thermoplastic polymeric material having a melting point above C., in the shape of the dental restoration to be made, to a porous refractory model, by means of a heated instrument, heating the assembly so obtained to a temperature at which the thermoplastic polymeric material liquefies and is sucked from the coating into the model, followed by raising the temperature of the assembly to a temperature at which the thermoplastic polymeric material disappears, and raising the temperature further to a sintering temperature at which the dental metal powder is sintered into a solid metal mass. The substructure so formed can be provided with a fired on coating of dental ceramics.
    Type: Grant
    Filed: July 2, 1991
    Date of Patent: September 1, 1992
    Assignee: Elephant Edelmetaal B.V.
    Inventor: Joseph M. van der Zel
  • Patent number: 5064731
    Abstract: A dental prosthesis comprises an inner layer portion and an outer layer portion. The outer layer portion is a dental porcelain material, while the inner layer portion is a sintered product which, after sintering, is composed of:(i) 40 to 95% by weight of one or (two or) more electric conductive ceramic materials selected from the group consisting of nitride ceramics, boride ceramics and carbide ceramics, all having a specific electric resistance of 10.sup.-1 or below, and(ii) 5 to 60% by weight of the following (A) and/or (B):(A) a dental porcelain material, and(B) one or (two or) more metals selected from the group consisting of Ti, Zr, Au, Pt, Pd, Ag, In and Sn.
    Type: Grant
    Filed: March 21, 1990
    Date of Patent: November 12, 1991
    Assignee: G-C Dental Industrial Corp.
    Inventors: Takashi Miyazaki, Takashi Inamochi, Masaaki Kitamura, Shohei Hayashi
  • Patent number: 5039574
    Abstract: The invention concerns a ceramically coated dental prosthesis in which the metal frame comprises an alloy containing, each in percent by weight: 0 to 0.4 carbon, 0.1 to 5.0 silicon, 0.01 to 8.0 manganese, 25 to 35 chromium, 1.0 to 8.0 molybdenum, 0.1 to 5 niobium, 0 to 0.3 nickel, 0 to 1.0 iron, the remainder being cobalt and impurities resulting from manufacturing conditions.
    Type: Grant
    Filed: September 14, 1987
    Date of Patent: August 13, 1991
    Assignee: Vereinigte Edelstahlwerke AG
    Inventor: Alfred Kulmburg
  • Patent number: 5011311
    Abstract: A dental alloy consists essentially of 60 to 85% by weight palladium, 5 to 20% by weight copper, 3 to 15% by weight gallium, and, as modifiers, 0.5 to 7% by weight gold, 0.005 to 0.02% by weight ruthenium, rhenium, iridium or a mixture of at least two of these metals, 1 to 5% by weight tin and 0 to 2% by weight nickel, wherein the sum of the modifiers is from 5.5 to 10% by weight. Dental restorations are produced by firing ceramic onto at least part of the surface of a casting of such an alloy.
    Type: Grant
    Filed: August 29, 1989
    Date of Patent: April 30, 1991
    Inventors: Brian C. Harris, Raymond Cook
  • Patent number: 4997723
    Abstract: A metal foil is provided for use in a metal-porcelain dental restoration, which metal foil provides improved color qualities to the finished restoration and improved bonding of the metal to the porcelain. The metal foil is made of an alloy comprising a major amount of gold, an amount of platinum or palladium, and an amount of a non-precious metal. An improved dental veneer and dental bridge can also be made using the metal foil of the invention.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: March 5, 1991
    Assignee: Tanaka Dental Enterprises
    Inventor: Asami Tanaka
  • Patent number: 4980124
    Abstract: An improvement is provided in the so-called "Foil" system for producing jacketed porcelain dental crowns. One of the most significant improvements is the formation of a crush-resistant coping comprised of a die-conforming noble metal foil and a bonded sintered alloy. Extremely strong crowns are produced in a short order of time by applying the porcelain over such a coping.
    Type: Grant
    Filed: June 29, 1989
    Date of Patent: December 25, 1990
    Inventor: David C. Dimmer
  • Patent number: 4943483
    Abstract: Dental restorations are made of a high palladium alloy which consists essentially of, on a weight basis, 70-82 percent palladium; 5-8 percent gold; 6.5-8 weight percent silver; 5-9 percent gallium; from 4 to 8 weight percent of a surface oxide producing modifier selected from the group consisting of indium, tin and mixtures thereof, from 0.01 up to 2 percent, ordinarily less than about 0.5 percent, of an oxygen scavenging component which is a member selected from the group consisting of germanium, lithium and mixtures thereof; and up to 2 percent of a grain refiner selected from the group consisting of ruthenium, rhenium and iridium. Alloy can be melted without the need of shielding the alloy from the atmosphere.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: July 24, 1990
    Assignee: Williams Dental Company, Inc.
    Inventors: Clyde E. Ingersoll, Stephen P. Schaffer, Patrick J. McCabe
  • Patent number: 4929420
    Abstract: The invention provides an alloy useful particularly in dentistry.The alloy of the invention in its broadest aspect contains from about 0.05 to about 8% by weight of indium and from about 8 to about 20% by weight of iridium, the balance essentially being platinum. Preferably, however, the allow consists essentially of platinum, iridium and indium, and contains from about 0.05 to about 8% by weight of indium, with the weight ratio of platinum to iridium being from about 84 to about 86:15.The alloy is useful in forming dental prostheses with aluminous porcelain or with a castable ceramic.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: May 29, 1990
    Assignee: The National Research Development Corporation
    Inventor: Peter Cook
  • Patent number: 4879136
    Abstract: A method of building a dental appliance and a kit for use in the method are provided. In the method, metal copings are coated with an opaque ceramic paste, and a coarse ceramic powder, having structural stability under the conditions needed to fire the ceramic paste, is dusted on the coating of ceramic paste, and the coping is fired. A coated metal coping with a rough, sandpaper like surface is produced, and subsequent layers of ceramic paste are applied to the rough surface to build up the dental appliance. The kit of the invention provides at least one preformed opaque ceramic paste, dusting powders, and other ingredients needed to build a dental appliance.
    Type: Grant
    Filed: October 15, 1987
    Date of Patent: November 7, 1989
    Assignee: Dentsply G.m.b.H.
    Inventor: M. H. Polz
  • Patent number: 4836984
    Abstract: Palladium alloys consisting of (a) 65 to 85% palladium, (b) 0 to 10% gold and/or 0 to 5% platinum, (c) 0.1 to 10% tin, (d) 1 to 10% gallium, (e) 1 to 12% copper, (f) 0.05 to 1.5% ruthenium and/or 0.05 to 0.7% rhenium as well as (g) 0.01 to 4% tungsten and/or 0.01 to 4% aluminum and/or 0.01 to 4% zinc are use to produce firmly seated and removable dentures. These alloys do not form oxide films when melted in air.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: June 6, 1989
    Assignee: Degussa Aktiengesellschaft
    Inventors: Rudolf Wagner, Harry Schiwiora, Manfred Stumke, Werner Groll
  • Patent number: 4830824
    Abstract: An alloy for producing dental castings comprises 26.5 to 27.5% Cr, 4.5 to 5.5% Mo, 0.65 to 0.8% Mn, 0.4 to 0.5% Si, up to 1% Fe, up to 0.05% C, and the balance Co.
    Type: Grant
    Filed: March 19, 1987
    Date of Patent: May 16, 1989
    Assignee: Fried. Krupp Gesellschaft mit beschrankter Haftung
    Inventor: Jurgen Lindigkeit
  • Patent number: 4814008
    Abstract: A dental material of a metal composition for reinforcing the metal framework of a dental restoration comprising an aggregate combination of metal particles including a first high fusing temperature precious metal component and a second low fusing temperature precious metal component. The particles of the first component are in a proportion of 1-15% by volume of the total composition and have a particle size at least about five times larger than the particle size of the second component.
    Type: Grant
    Filed: April 15, 1985
    Date of Patent: March 21, 1989
    Inventors: Itzhak Shoher, Aharon E. Whiteman
  • Patent number: 4812288
    Abstract: A Ni-Cr based alloy not containing precious metals has been developed for prosthetic dentistry uses. The alloy is characterized by high hardness, good workability, high corrosion resistance and optimal adherence to ceramic materials, and consists essentially of:______________________________________ Cr 22.0-25.0% weight Mo 5.5-7.5% weight Si 2.0-4.5% weight B 0.25-0.50% weight Al .ltoreq.0.2% weight Fe .ltoreq.0.5% weight C .ltoreq.0.05% weight Cu .ltoreq.0.5% weight Mn .ltoreq.0.5% weight S .ltoreq.0.01% weight Rare earths 0.005-0.2% weight remainder Ni and impurities.
    Type: Grant
    Filed: January 5, 1988
    Date of Patent: March 14, 1989
    Assignee: Centro Sviluppo Materiali S.p.A.
    Inventors: Alberto Tamba, Silverio Fioravanti, Antonio Scaccia
  • Patent number: 4806306
    Abstract: Noble metal alloys are used to produce attachments that can be cast-on, particularly in dental technology, having a melting range above C. The alloys comprise about 40-70% platinum, about 10-40% palladium, about 5-20% iridium, about 0.5-10% gold, about 0-13 3% silver and about 0-1% each of ruthenium and rhodium.
    Type: Grant
    Filed: March 9, 1988
    Date of Patent: February 21, 1989
    Assignee: Degussa Aktiengesellschaft
    Inventors: Werner Groll, Rudi Steinke, Harry Schiwiora
  • Patent number: 4804517
    Abstract: A yellow dental alloy containing a colored intermetallic compound of palladium and indium as 15-85% by weight of the alloy and at least 10% by weight of silver and as desired gold 0-30%, copper 0-45% and silver 10-50%. This alloy exhibits a pale yellow gold color which it derives from the interaction of two white colored metals--palladium and indium. Various alloying additions are specified to improve castability, ductility, strength, hardness, tarnish and corrosion resistance.
    Type: Grant
    Filed: April 22, 1987
    Date of Patent: February 14, 1989
    Assignee: Williams Dental Company, Inc.
    Inventors: Stephen P. Schaffer, Clyde E. Ingersoll