Metallic Backing Patents (Class 433/208)
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Patent number: 10206763Abstract: 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: GrantFiled: December 15, 2014Date of Patent: February 19, 2019Inventor: Jack Levi
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Patent number: 9468509Abstract: 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: GrantFiled: March 14, 2014Date of Patent: October 18, 2016Assignee: CMP Industries LLCInventor: Devon O. Howe
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Publication number: 20140170598Abstract: 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: ApplicationFiled: December 14, 2012Publication date: June 19, 2014Applicant: BEGO Bremer Boldsclägerei Wilh, Herbst GmbH & Co. KGInventor: BEGO Bremer Goldschlägerel Wilh, Herbst GmbH & Co. KG
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Patent number: 8641418Abstract: 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: GrantFiled: March 29, 2011Date of Patent: February 4, 2014Assignee: Biomet 3I, LLCInventors: Robert L. Mayfield, Ross W. Towse
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Publication number: 20130295522Abstract: 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: ApplicationFiled: July 3, 2013Publication date: November 7, 2013Inventors: Christopher C.Y. CHU, Slawomir BANASIAK
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Patent number: 8517735Abstract: 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: GrantFiled: July 8, 2009Date of Patent: August 27, 2013Assignee: DENTSPLY International Inc.Inventors: Christopher C. Y. Chu, Slawomir Banasiak
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Patent number: 7329125Abstract: 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: GrantFiled: June 4, 2004Date of Patent: February 12, 2008Inventors: Itzhak Shoher, Aharon Whiteman
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Publication number: 20040197739Abstract: 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: ApplicationFiled: January 20, 2004Publication date: October 7, 2004Inventor: Alain Fournet
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Publication number: 20040152049Abstract: 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: ApplicationFiled: January 31, 2003Publication date: August 5, 2004Inventor: Sebastiaan Cornelissen
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Patent number: 6613273Abstract: 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: GrantFiled: January 10, 2001Date of Patent: September 2, 2003Assignee: Jeneric/Pentron IncorporatedInventors: Gregg Daskalon, Arun Prasad, Denise L. North, Elie Zammarieh
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Patent number: 6290501Abstract: 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: GrantFiled: December 2, 1999Date of Patent: September 18, 2001Assignee: Degussa-Huls AktiengesellschaftInventors: Franz Josef Grau, Joseph Maria Van Der Zel
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Patent number: 5713994Abstract: 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: GrantFiled: June 10, 1996Date of Patent: February 3, 1998Assignee: Ceramco Inc.Inventors: Carolyn M. Kramer, John F. McLaughlin, Robert D. DeLuca, John A. Hornor, Mary J. Daub, Kevin A. Andino
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Patent number: 5431875Abstract: 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: GrantFiled: May 2, 1994Date of Patent: July 11, 1995Assignee: The J. M. Ney CompanyInventors: Thomas B. Cameron, Edward F. Smith, III
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Patent number: 5362438Abstract: 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: GrantFiled: June 10, 1993Date of Patent: November 8, 1994Assignee: Elephant Edelmetaal B.V.Inventor: Joseph M. van der Zel
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Patent number: 5346396Abstract: 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: GrantFiled: February 9, 1993Date of Patent: September 13, 1994Assignee: Olympus Optical Co., Ltd.Inventor: Yasuharu Hakamatsuka
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Patent number: 5322110Abstract: 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: GrantFiled: January 17, 1992Date of Patent: June 21, 1994Assignee: Giselher WallInventors: Giselher Wall, Manfred Lutzman
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Patent number: 5290371Abstract: 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: GrantFiled: October 28, 1992Date of Patent: March 1, 1994Assignee: The J. M. Ney CompanyInventors: Thomas B. Cameron, Edward F. Smith, III
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Patent number: 5186626Abstract: 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: GrantFiled: May 22, 1991Date of Patent: February 16, 1993Assignee: Asami Tanaka Dental EnterprisesInventor: Asami Tanaka
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Patent number: 5173114Abstract: 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: GrantFiled: January 30, 1992Date of Patent: December 22, 1992Assignee: Suissor, S.A.Inventor: Michel Heurtaux
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Patent number: 5143692Abstract: 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: GrantFiled: July 2, 1991Date of Patent: September 1, 1992Assignee: Elephant Edelmetaal B.V.Inventor: Joseph M. van der Zel
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Patent number: 5118296Abstract: 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: GrantFiled: August 9, 1990Date of Patent: June 2, 1992Inventor: Peter Eldred
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Patent number: 5108506Abstract: 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: GrantFiled: April 27, 1989Date of Patent: April 28, 1992Assignee: Sankin Kogyo Kabushiki KaishaInventors: Sadayuki Yuhda, Masahiko Ueda
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Patent number: 5104323Abstract: 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: GrantFiled: May 16, 1991Date of Patent: April 14, 1992Inventor: Claus-Jurgen Mertens
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Patent number: 5011410Abstract: 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: GrantFiled: September 14, 1989Date of Patent: April 30, 1991Assignee: Minnesota Mining and Manufacturing Co.Inventors: Scott R. Culler, Jon W. Fundingsland, Dwight W. Jacobs
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Patent number: 4980124Abstract: 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: GrantFiled: June 29, 1989Date of Patent: December 25, 1990Inventor: David C. Dimmer
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Patent number: 4978391Abstract: 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: GrantFiled: March 27, 1989Date of Patent: December 18, 1990Assignee: Dentsply Management Corp.Inventor: Leslie A. Jones
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Patent number: 4879136Abstract: 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: GrantFiled: October 15, 1987Date of Patent: November 7, 1989Assignee: Dentsply G.m.b.H.Inventor: M. H. Polz
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Patent number: 4826436Abstract: 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: GrantFiled: November 13, 1987Date of Patent: May 2, 1989Inventors: Itzhak Shoher, Aharon E. Whiteman
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Patent number: 4806383Abstract: 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: GrantFiled: February 24, 1987Date of Patent: February 21, 1989Assignee: Dentsply GmbHInventor: H. Poltz
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Patent number: 4579529Abstract: 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: GrantFiled: April 17, 1984Date of Patent: April 1, 1986Inventor: Rufino A. Urena
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Patent number: 4556389Abstract: 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: GrantFiled: December 31, 1981Date of Patent: December 3, 1985Assignees: Four Brain Company Ltd., Kyoto Ceramic Company Ltd.Inventors: Masato Ueno, Masayoshi Sato, Mitsuyuki Tasaka, Tatsuro Naito
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Patent number: 4552779Abstract: 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: GrantFiled: November 28, 1983Date of Patent: November 12, 1985Assignee: Douglass B. RobertsInventor: Scott G. McClure
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Patent number: 4543064Abstract: 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: GrantFiled: April 14, 1980Date of Patent: September 24, 1985Inventor: Ehrenfried G. B. Wolf
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Patent number: 4481036Abstract: 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: GrantFiled: March 9, 1983Date of Patent: November 6, 1984Assignee: Johnson & Johnson Dental Products CompanyInventor: Carlino Panzera
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Patent number: 4461618Abstract: 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: GrantFiled: November 10, 1982Date of Patent: July 24, 1984Assignee: Johnson & Johnson Dental Products CompanyInventors: Robert D. DeLuca, Robin M. F. Jones
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Patent number: 4451236Abstract: 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: GrantFiled: August 11, 1983Date of Patent: May 29, 1984Inventors: 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
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Patent number: 4392829Abstract: 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: GrantFiled: March 31, 1981Date of Patent: July 12, 1983Inventor: Asami Tanaka
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Patent number: 4358271Abstract: 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: GrantFiled: February 11, 1981Date of Patent: November 9, 1982Assignee: Heraeus Edelmetalle GmbHInventors: Franz Sperner, Heidi Brink, deceased
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Patent number: 4318697Abstract: 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: GrantFiled: July 11, 1980Date of Patent: March 9, 1982Inventors: Itzhak Shoher, Aharon E. Whiteman
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Patent number: 4231740Abstract: 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: GrantFiled: February 2, 1979Date of Patent: November 4, 1980Inventors: Itzhak Shoher, Aharon E. Whiteman