Metallic Backing Patents (Class 433/208)
  • Patent number: 10206763
    Abstract: This invention is a method and product that can be restored with a porcelain facial veneer, ENDODONTIC VENEER EV™ made of hard porcelain material such as IPS EMAX™ or zirconia porcelain, as well as Ceram layering ceramic and other porcelain materials. The facial incisal and lingual surfaces of teeth are prepared minimally. A labial chamfer of 0.3-0.5 mm is prepared labially into enamel extending 1.5 mm to the incisal. A rhomboid access inlay preparation is made on the lingual surface with an extended post 3-5 mm below the height of the crest of bone, extending into a post space barrier cement 1.5 mm to form a secondary ferrule. The invention prevents bacterial microleakage to the apex and tooth fracture. It will also prevent root canal failures.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: February 19, 2019
    Inventor: Jack Levi
  • Patent number: 9468509
    Abstract: Dental prostheses and methods for making them are disclosed. In one embodiment, a method comprises a sequence of steps including milling a cavity in a block of a coping material, filling the cavity with a green ceramic material, milling a portion of the green ceramic material away to leave a layer of green ceramic material on an occlusal surface formed in the coping material, milling the underside of the block of coping material to form the coping with green ceramic material, and sintering the coping with green ceramic material to complete the prosthesis. The milling steps may be performed by a computer-controlled mill. The computer may execute a CAD-CAM program that includes data from a three dimensional model of a tooth that is to receive the prosthesis. The dental prosthesis may be a dental crown or a dental bridge.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: October 18, 2016
    Assignee: CMP Industries LLC
    Inventor: Devon O. Howe
  • Publication number: 20140170598
    Abstract: The present invention relates to a cobalt-based noble-metal dental alloy for the SLM process, which is intended for the production of metallic components, a corresponding method of producing a metallic component and a corresponding metallic component.
    Type: Application
    Filed: December 14, 2012
    Publication date: June 19, 2014
    Applicant: BEGO Bremer Boldsclägerei Wilh, Herbst GmbH & Co. KG
    Inventor: BEGO Bremer Goldschlägerel Wilh, Herbst GmbH & Co. KG
  • 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: 20130295522
    Abstract: A dental prosthesis, typically formed in a press to metal process, includes application of a porcelain composition sufficient to form a veneer on a dental prosthesis supporting metal structure, the composition having an integrated tooth-like translucency providing an aesthetic appearance. The composition is formed of a dentin frit and an enamel frit, typically sintered into a desired ingot shape including an amount of composition sufficient to veneer the prosthesis. The porcelain composition is a component of a kit that includes opaquers, other porcelains and stains useful in finishing to provide an aesthetic prosthesis.
    Type: Application
    Filed: July 3, 2013
    Publication date: November 7, 2013
    Inventors: Christopher C.Y. CHU, Slawomir BANASIAK
  • Patent number: 8517735
    Abstract: A dental prosthesis, typically formed in a press to metal process, includes application of a porcelain composition sufficient to form a veneer on a dental prosthesis supporting metal structure, the composition having an integrated tooth-like translucency providing an aesthetic appearance. The composition is formed of a dentin frit and an enamel frit, typically sintered into a desired ingot shape including an amount of composition sufficient to veneer the prosthesis. The porcelain composition is a component of a kit that includes opaquers, other porcelains and stains useful in finishing to provide an aesthetic prosthesis.
    Type: Grant
    Filed: July 8, 2009
    Date of Patent: August 27, 2013
    Assignee: DENTSPLY International Inc.
    Inventors: Christopher C. Y. Chu, Slawomir Banasiak
  • Patent number: 7329125
    Abstract: A method to increase the cement retention of a metal dental coping to the structure of a tooth in the preparation of a crown or bridge. The method includes forming a liquid composition of high and low fusing temperature metal particles with at least 50% of the high fusing metal particles having a thin cross-sectional average thickness of less than 5 microns and coating the interior surfaces of the metal coping with the liquid composition to form a thin coating of no greater than 20 microns before the coping is mounted on the tooth structure. The thin coating of liquid composition should then be heat treated at a temperature of between 750° C. and 1050° C. to permit the low-fusing temperature metal particles to fuse but not entirely melt. Following heat treatment a dental cement should be applied to the tooth structure or coping in a conventional manner. Thereafter, the coping is mounted on the tooth structure with the heat treated coating in contact with the dental cement to improve retention.
    Type: Grant
    Filed: June 4, 2004
    Date of Patent: February 12, 2008
    Inventors: Itzhak Shoher, Aharon Whiteman
  • Publication number: 20040197739
    Abstract: The invention concerns dental prostheses. It concerns a method for making a dental prosthesis of composite material by forming an adhesive interface between a metallic support and a cured ceramic material less than 3 mm thick, forming an intermediate interface by treating the surface of a ceramic material with an organic silane, and forming an adhesive interface of the reconstructing mass by treating the silane with an adhesive material compatible with the composite material. The intermediate interface is prepared by an etching operation in conditions liable to form cracks or embrittle the ceramics. The invention is applicable to dental prostheses made of composite material.
    Type: Application
    Filed: January 20, 2004
    Publication date: October 7, 2004
    Inventor: Alain Fournet
  • Publication number: 20040152049
    Abstract: A method of preparing a dental restoration that includes forming one or more galvano substructures; pressing the galvano substructures into a ceramic material to form a dental restoration; polishing an outer surface of the dental restoration; and sealing the dental restoration. The dental restoration may be a dental crown or a dental bridge. Dental restorations prepared using the method are also disclosed.
    Type: Application
    Filed: January 31, 2003
    Publication date: August 5, 2004
    Inventor: Sebastiaan Cornelissen
  • 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
  • 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
  • Patent number: 5713994
    Abstract: A low-fusing temperature porcelain compositions, methods of use thereof on metal or porcelain substrates to form dental prostheses and kits therefor. Compositions of the invention have a fusing temperature of less than 800.degree. C. and a coefficient of thermal expansion compatible with a substrate of metal or ceramic. Each composition includes, in weight percent of the composition, from 40 to 65 percent by weight SiO.sub.2, from 6 to 12 percent by weight Al.sub.2 O.sub.3, from 6 to 12 percent by weight Na.sub.2 O, from 5.5 to 10.50 percent by weight K.sub.2 O, from 1 to 3 percent by weight Li.sub.2 O, from 0.8 to 2.5 percent by weight CaO, from 0.8 to 4.0 percent by weight B.sub.2 O.sub.3 and from 0.1 to 0.8 percent by weight CeO.sub.2.
    Type: Grant
    Filed: June 10, 1996
    Date of Patent: February 3, 1998
    Assignee: Ceramco Inc.
    Inventors: Carolyn M. Kramer, John F. McLaughlin, Robert D. DeLuca, John A. Hornor, Mary J. Daub, Kevin A. Andino
  • 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 1400.degree. 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: 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: 5346396
    Abstract: A wax pattern is built up on the surface of the other end of a post comprising pure titanium. The wax pattern is used to produce a casting mold. While the casting mold is kept at a predetermined temperature, a crystallized glass having a thermal expansion coefficient falling within the range of .+-.5.times.10.sup.-7 with respect to that of pure titanium is melted and cast in the mold. The resultant mold product is heated and crystallized to obtain a dental prosthesis. A post comprising pure titanium is chemically bonded to a core comprising the crystallized glass. This invention provides a dental prosthesis which is easy to manufacture and nontoxic to the human body.
    Type: Grant
    Filed: February 9, 1993
    Date of Patent: September 13, 1994
    Assignee: Olympus Optical Co., Ltd.
    Inventor: Yasuharu Hakamatsuka
  • Patent number: 5322110
    Abstract: In a dental prosthetic casting-on process, in which a secondary part made of metal is cast-on to a primary part made of metal, a primary part made from an oxide-forming metal alloy may be used if the latter's casting-on surface is alloyed, prior to casting-on, with a reducing metalloid. In this regard, boron, silicon or phosphorus, for example, can be made to diffuse into the surface lattice of the primary part. A primary part made from an oxide-forming dental alloy and suitable for such a casting-on process exhibits in its casting-on surface an enhanced boron or silicon or phosphorus content.
    Type: Grant
    Filed: January 17, 1992
    Date of Patent: June 21, 1994
    Assignee: Giselher Wall
    Inventors: Giselher Wall, Manfred Lutzman
  • Patent number: 5290371
    Abstract: A noble metal dental casting alloy for use in making dental restorations comprises 35-70 percent by weight palladium, 25-50 percent by weight silver, 0.5-10 percent by weight manganese, and 1-30 percent of at least one modifier element selected from (i) the group of gold, platinum, copper, tin, gallium, zinc, indium and cobalt in amounts of up to 15 percent by weight each, and (ii) the group of ruthenium, rhenium, aluminum, germanium, lithium, silicon, iridium, boron, tantalum and niobium in amounts of up to 5 percent by weight each. The alloy has a solidus temperature of at least 1100.degree. C., a liquidus temperature of not more than 1400.degree. C., tensile elongation of at least 2 percent, thermal expansion coefficient of at least 14.0.times.10.sup.-6 per .degree.C., Vickers hardness of at least 150, and offset yield strength at 0.2 percent of at least 250 MPa.
    Type: Grant
    Filed: October 28, 1992
    Date of Patent: March 1, 1994
    Assignee: The J. M. Ney Company
    Inventors: Thomas B. Cameron, Edward F. Smith, III
  • 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: 5173114
    Abstract: The present invention relates to a ceramic basal layer for opacifying the metal coping of a ceramo-metallic dental reconstruction.The ceramic basal layer for opacifying the metal coping of a ceramo-metallic dental reconstruction consists of an undercoat of opaque slip produced from a glass frit high in fluxes and in particular in B.sub.2 O.sub.3, covered with an opaque layer produced from a glass frit high in opacifying metal oxides and containing approximately 30% by weight of refractory particles with a particle size of between approximately 40 microns and approximately 100 microns.
    Type: Grant
    Filed: January 30, 1992
    Date of Patent: December 22, 1992
    Assignee: Suissor, S.A.
    Inventor: Michel Heurtaux
  • 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 50.degree. 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: 5118296
    Abstract: In the formation of a dental restoration unit, a procedure for securely bonding composite resin material to a core structure is employed. A core structure comprising, for example, metal, is wholly or partially covered with a cohesion layer comprised of a blend of lithium, aluminum silicat and fused quartz silicate. The composite resin material is fused to the cohesion. The resulting restoration unit, such as a crown, is less liable to fracture than is porcelain, and can provide a surface which is no more abrasive than is natural tooth enamel.
    Type: Grant
    Filed: August 9, 1990
    Date of Patent: June 2, 1992
    Inventor: Peter Eldred
  • Patent number: 5108506
    Abstract: A dental cement having a composition consisting essentially of a hardening liquid, a hardening accelerator, wherein the hardening liquid consists essentially of carboxyl-modified silicone oil.
    Type: Grant
    Filed: April 27, 1989
    Date of Patent: April 28, 1992
    Assignee: Sankin Kogyo Kabushiki Kaisha
    Inventors: Sadayuki Yuhda, Masahiko Ueda
  • Patent number: 5104323
    Abstract: A metal-ceramic filling to be cemented into a cavity of a tooth (10), which consists of cast metal (1) on its side capable of bearing weight, on which a ceramic material (2) is applied by means of a firing technique. The cast metal (1) is thinner on its edge, so that it can be applied by rotation and finishing to a beveled area (12). The filling can be laterally extended into an occlusal cusp. The filling can be used as a bridge anchor.
    Type: Grant
    Filed: May 16, 1991
    Date of Patent: April 14, 1992
    Inventor: Claus-Jurgen Mertens
  • Patent number: 5011410
    Abstract: Metal dental articles with a layer of exogenous inorganic oxide thereon, and a method of applying such a layer, which method involves heating a coating of a coupling agent for a temperature and for a time sufficient to convert the coating to a layer of exogenous inorganic oxide.
    Type: Grant
    Filed: September 14, 1989
    Date of Patent: April 30, 1991
    Assignee: Minnesota Mining and Manufacturing Co.
    Inventors: Scott R. Culler, Jon W. Fundingsland, Dwight W. Jacobs
  • 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: 4978391
    Abstract: A method for cushioning dental appliance in the mouth using a visible light cured polymeric material which can also be used in a method for intraoral medicament delivery in the mouth is provided. When used with an orthodontic bracket, for example, the light cured polymeric material is dispensed on the orthodontic bracket after the bracket is in place and the material is light cured on the bracket. When used in a method of intraoral delivery of a medicament, a medicament is added to the polymeric material and the polymeric material is applied in the same manner as described for cushioning an orthodontic bracket.
    Type: Grant
    Filed: March 27, 1989
    Date of Patent: December 18, 1990
    Assignee: Dentsply Management Corp.
    Inventor: Leslie A. Jones
  • 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: 4826436
    Abstract: The dental prosthesis of the present invention includes a plurality of flexible metal arm connectors which extend from a common member in forming a bridge or from a common joint in forming a splint. The arm connectors are adapted to be affixed to adjacent retaining members on the abutment teeth to be restored. The arm connectors must be sufficient in length to make reasonable contact with the buccal and lingual surfaces and preferably should contact the occlusal surface as well. The arm connectors may be ring-like in geometry and/or be corrugated for expansion.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: May 2, 1989
    Inventors: Itzhak Shoher, Aharon E. Whiteman
  • Patent number: 4806383
    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 opague 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: February 24, 1987
    Date of Patent: February 21, 1989
    Assignee: Dentsply GmbH
    Inventor: H. Poltz
  • Patent number: 4579529
    Abstract: The present invention relates to a fixed dental prosthesis having a non-metallic central nucleus, a metallic tube-shaped frame surrounding the nucleus, and an external coating surrounding the frame. The nucleus and coating comprise the same material and are joined together without any discontinuity along the upper and lower edges of the frame in order to define the crown and base of the dental prosthesis. The invention further relates to a system for fixed dental prostheses including a plurality of dental pieces fixed together, each of the dental pieces, including the non-metallic central nucleus, a metallic tube-shaped frame surrounding the nucleus, and an external coating surrounding the frame.
    Type: Grant
    Filed: April 17, 1984
    Date of Patent: April 1, 1986
    Inventor: Rufino A. Urena
  • Patent number: 4556389
    Abstract: A novel method for firmly bonding metal and ceramics comprising the steps of applying a composite plating composition consisting of a metal containing plating solution and fine particles of ceramic on a surface of metal to which the ceramic is to be bonded, thereby forming a metal plating layer on the surface having partially projected fine particles of ceramic, and then firing the coated metal in order to fuse the ceramic thereto.
    Type: Grant
    Filed: December 31, 1981
    Date of Patent: December 3, 1985
    Assignees: Four Brain Company Ltd., Kyoto Ceramic Company Ltd.
    Inventors: Masato Ueno, Masayoshi Sato, Mitsuyuki Tasaka, Tatsuro Naito
  • Patent number: 4552779
    Abstract: A process for preparing a cast metal surface such that it is usable for bonding to a tooth structure. A water soluble adhesive medium is placed on a stone cast of a tooth or teeth. A mixture of soluble and non-soluble particles are then placed onto the adhesive. The soluble particles partially dissolve into the adhesive medium while the non-soluble particles adhere to the adhesive. Wax or resin is flowed over the resultant surface to imbed the particles therein. The desired tooth form is then completed after which the adhesive is dissolved away to release the pattern from the cast. The remaining soluble particles are then washed away leaving voids in the surface of the pattern. These voids are then duplicated using standard lost wax casting procedures to reproduce the surface in metal. The surface, which has a multiplicity of voids, roughnesses, and undercuts, is then filled with a bonding medium to attach the rigid cast metal appliance to a tooth surface.
    Type: Grant
    Filed: November 28, 1983
    Date of Patent: November 12, 1985
    Assignee: Douglass B. Roberts
    Inventor: Scott G. McClure
  • Patent number: 4543064
    Abstract: This invention is directed to the use of a false tooth having an attaching means rearwardly directed on the rear of the false tooth. The attaching means makes it possible to more definitely and more easily position the false tooth while working an individual tooth and while forming the dental bridge.After the dental bridge has been formed the attaching means can be removed so as to have the finished dental bridge.The result is that a desirable dental bridge can be prepared from factory made false teeth and also can be prepared in less time and with less expense than the conventional method prior to this invention.
    Type: Grant
    Filed: April 14, 1980
    Date of Patent: September 24, 1985
    Inventor: Ehrenfried G. B. Wolf
  • Patent number: 4481036
    Abstract: A stable glaze for use on ceramic dental copings has the following composition:Component Proportion, % ______________________________________ SiO.sub.2 71-74 Al.sub.2 O.sub.3 10-12 K.sub.2 O 4-5 Na.sub.2 O 4-5 CaO 2-4.5 B.sub.2 O.sub.3 3.5-5.
    Type: Grant
    Filed: March 9, 1983
    Date of Patent: November 6, 1984
    Assignee: Johnson & Johnson Dental Products Company
    Inventor: Carlino Panzera
  • Patent number: 4461618
    Abstract: A process for producing a dental restoration wherein a bonding agent is disclosed for bonding dental porcelain to a nickel-containing metal core. The bonding agent is aluminum powder and an inert organic liquid carrier.
    Type: Grant
    Filed: November 10, 1982
    Date of Patent: July 24, 1984
    Assignee: Johnson & Johnson Dental Products Company
    Inventors: Robert D. DeLuca, Robin M. F. Jones
  • Patent number: 4451236
    Abstract: The dental prosthesis comprises a base from a durable corrosion-resistant metallic alloy and at least one external decorative layer. The external decorative layer is made of a harder material than the base and comprises nitrides, oxynitrides, carboxynitrides, cyanonitrides and/or oxides of metals of the subordinate subgroup of Group IV of the periodic system. The thickness ratio of the external decorative layer to the base is equal to 1:10-200 respectively.In the case where the dental prosthesis base comprises a structure of soldered members from a durable corrosion-resistant metallic alloy, the method for making the dental prosthesis comprises manufacture of the base by soldering members of the dental prosthesis from the abovementioned alloy into an integrated structure. Then the zone of the soldered juncture or the entire structure is coated, by electroplating or vacuum technique, with an additional layer from cobalt, nickel, molybdenum, chromium or zirconium, or from nitrides of chromium or molybdenum.
    Type: Grant
    Filed: August 11, 1983
    Date of Patent: May 29, 1984
    Inventors: Jury A. Tarasov, Ljudmila V. Zhivkova, Anatoly M. Kotlyar, Vasily P. Panchokha, Natalia V. Alexeenko, Anatoly I. Grabchenko, Viktor G. Lappo, Albert M. Boyarunas, Vitaly F. Drozhin, Anatoly A. Andreev, Igor V. Gavrilko, Mikhail A. Napadov, Valentin G. Padalka, Abram L. Sapozhnikov
  • Patent number: 4392829
    Abstract: A baked metal-porcelain dental restoration is provided, including a method of making same. The restoration includes a substrate formed from a non-cast thin metal foil having a textured exterior surface onto which a dental porcelain jacket is directly bonded without any intermediate interface compositions. The exterior of the porcelain jacket may be configured as necessary to provide a desired occlusal surface.The dental restoration is made by providing a support post with a configuration that corresponds to the shape of a tooth base in a patient's mouth. The support post is coated with a thin spacing layer. A thin metal foil is swaged around the coated support post to substantially conform to the shape of the post. The exterior of the foil substrate is textured and porcelain powder is applied thereto without the use of any intermediate interface composition between the foil and powder. The metal substrate and applied powder are baked to bond the porcelain directly to the metal foil.
    Type: Grant
    Filed: March 31, 1981
    Date of Patent: July 12, 1983
    Inventor: Asami Tanaka
  • Patent number: 4358271
    Abstract: An improved method for preparing a dental prosthetic construction such as a crown or bridge is described by applying a dental ceramic composition to a base of a precious metal silver-containing alloy, drying it and firing the same. In accordance with the improvement, the firing is conducted in a reducing atmosphere.
    Type: Grant
    Filed: February 11, 1981
    Date of Patent: November 9, 1982
    Assignee: Heraeus Edelmetalle GmbH
    Inventors: Franz Sperner, Heidi Brink, deceased
  • Patent number: 4318697
    Abstract: The dental restorative structure of the present invention comprises a porcelain superstructure surrounding a metal substructure composed of a framework of relatively thin metal rod-like members. The rod-like members extend gingivally from a relatively crescent shaped member. An additional upright brace extends toward the incisal edge of the restoration and includes an opening for forming a porcelain pocket between the brace and the crescent shaped member.
    Type: Grant
    Filed: July 11, 1980
    Date of Patent: March 9, 1982
    Inventors: Itzhak Shoher, Aharon E. Whiteman
  • Patent number: 4231740
    Abstract: The dental restorative structures of the present invention comprise a porcelain superstructure surrounding a metal substructure composed of a framework of relatively thin metal members interconnected to form concavities within the porcelain superstructure.
    Type: Grant
    Filed: February 2, 1979
    Date of Patent: November 4, 1980
    Inventors: Itzhak Shoher, Aharon E. Whiteman