Dental Or Body Impression Taking Material Patents (Class 523/109)
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Patent number: 5177120Abstract: Disclosed is a new urethane polyacrylate having at least one terminal isocyanato acrylic pendent radical. Preferably the molecular chain within the acrylate caps has been extended with a polyhydroxy compound just before final end capping with isocyanato acrylic. The isocyanato acrylic is preferably isocyanato ethyl methacrylate and the urethane is diisocyanate capped polyether and the polyether radical is oxyalkylene. The method for producing the urethane polyacrylate involves end capping a polyol with diisocyanate yielding a reaction product with two reactive equivalents of isocyanate and then capping less than all of the isocyanate with a hydroxyacrylate, after which the remaining isocyanate is reacted with polyol to provide chain extension. The chain extending polyol is then capped with a isocyanato acrylic.Type: GrantFiled: November 13, 1987Date of Patent: January 5, 1993Assignee: Dentsply Research & Development Corp.Inventors: Pamela H. Hare, Paul D. Hammesfahr
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Patent number: 5151479Abstract: This invention provides dental adhesive compositions consisting essentially of(a) an aliphatic amine salt of a polymerizable phosphoric ester, as represented by the formula ##STR1## where R and R' are specific radicals; (b) at least one radical-polymerizable unsaturated monomer; and(c) a radical polymerization initiator. These compositions are useful in bonding living dental tissue restoration materials to living tooth tissues, particularly to dentin.Type: GrantFiled: April 20, 1990Date of Patent: September 29, 1992Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Nobuhiro Mukai, Hitoshi Ige, Takayuki Makino, Junko Atarashi
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Patent number: 5130348Abstract: There is disclosed a polyether impression material containing(a) a polyether,(b) a catalyst, and(c) a mixing additive,in which the components (a) and (b) are spatially separate from each other, and in which the mixing additive (c) is polyalkylene oxide derivative with a molecular weight above 300, which is chemically inert with the other components present and in particular, does not contain hydroxyl groups, acid groups, primary amino groups, ionic groups, halogen groups or groups capable of polymerization. The composition can be mixed easily, has outstanding storage stability and does not dissociate even under increased pressure.Type: GrantFiled: September 11, 1990Date of Patent: July 14, 1992Assignee: THERA Patent GmbH & Co., KGInventors: Wolf-Dietrich Zahler, Oswald Gasser, Klaus Ellrich
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Patent number: 5112884Abstract: The invention relates to a dental filling material containing at least one polymerizable (meth)-acrylic acid ester, characterized in that it contains 20 to 90% by weight, calculated on the total composition, of a compound consisting of the structural element E2 and at least one of the structural elements E1 and/or E3 and/or E4 of the general formula ##STR1## where R.sub.1 denotes a methyl, ethyl, n-propyl, isopropyl or an unsubstituted or CH.sup.3 --C.sub.3 H.sub.7 --substituted phenyl radical, R.sub.2 denotes a CH.sub.2 .dbd.CH--, CH.sub.2 .dbd.CHCOO(CH.sub.2).sub.n --]or ##STR2## or R.sub.1, n denotes 0, 1, 2 or 3, and M denotes titanium or zirconium.Type: GrantFiled: February 2, 1990Date of Patent: May 12, 1992Assignee: The Procter & Gamble CompanyInventor: Bernhard Hanke
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Patent number: 5100929Abstract: Photopolymerizable dental compositions are proposed which are curable with visible light and which apart from usual auxiliary substances and additives contain polymerizable monomers of the group of the poly-thiol compounds and of the group of the poly-ene compounds and a photoinitiator and which, in order to obtain a curing free from any smeary layer, contain at least 10% by weight poly-thiol compound(s), at least 10% by weight poly-ene compound(s) and 0.01 to 5% by weight of at least one acyl phosphine compound as photoinitiator. The compositions can advantageously be used as dental impression compositions.Type: GrantFiled: October 30, 1989Date of Patent: March 31, 1992Assignee: Espe Stiftung & Co. Produktion- und Vertriebs KGInventors: Peter Jochum, Oswald Gasser, Erich Wanek, Rainer Guggenberger, Klaus Ellrich
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Patent number: 5091441Abstract: The invention provides dental compositions comprising a radical-polymerizable monomer and an organic peroxide, which are dissolved in a volatile tertiary alochol. Also provided are the compositions packed in a plastic contains, having a long shelf life.Type: GrantFiled: July 13, 1989Date of Patent: February 25, 1992Assignee: Kuraray Co., Ltd.Inventor: Ikuo Omura
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Patent number: 5064891Abstract: A curable silicone composition comprising:(A) an organopolysiloxane having at least two silicon-bonded aliphatic unsaturated hydrocarbon radicals in its molecule;(B) an organohydrogenpolysiloxane having at least three silicon-bonded hydrogen atoms in its molecule;(C) a platinum family metal catalyst; and(D) a nonionic surface active agent having a hydrophobic silicone portion and at least one hydrophilic polyol portion in its molecule. The curable silicone composition gives cured products having good hydrophilic properties and dimensional stability, and are especially suitable for use as a dental impression material.Type: GrantFiled: May 18, 1990Date of Patent: November 12, 1991Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Hironao Fujiki, Mikio Shiono, Toshiaki Takahashi
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Patent number: 5063255Abstract: A dental photopolymerizable type resin composition is provided, which comprises (a) a photopolymerizable compound that has therein at least one ethylenically unsaturated double bond and is a solid either crystalline or amorphous at 40.degree. C. or lower, (b) an inorganic filler, (c) a photopolymerization initiator, and (d) a reducing agent. That compound may be a mono- or poly-functional (meth)acrylate.Type: GrantFiled: November 1, 1989Date of Patent: November 5, 1991Assignee: G-C Toshi Kogyo CorporationInventors: Akira Hasegawa, Hiroshi Mori, Tatsuhiko Takahashi, Yasuyuki Sano
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Patent number: 5037473Abstract: A denture liner composition is provided comprising a methacrylate polymer and/or copolymer in powder form to be wetted by a liquid composition containing dimethacrylate, butyl methacrylate, and long chain methacrylate monomers, the mixture setting upon wetting and being polymerized by visible light and chemical action. A method for using the composition in denture liner formation is also provided.Type: GrantFiled: April 18, 1989Date of Patent: August 6, 1991Inventors: Joseph M. Antonucci, Robert E. Muller
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Patent number: 5034433Abstract: A composite dental cement composition that is suitable for application with dental posts for either post insertion in a tooth or during core formation is provided. The cement composition includes a polymer matrix in an amount between about 15 and 50 weight percent, a filler in an amount between about 35 and 80 weight percent, and titanium in an amount between about 1 and 15 weight percent. The titanium ingredient chemically interacts with the polymer matrix in order to increase compressive strength of the cement composition. A fluoride compound may be added in order to substantially eliminate caries and further tooth decay.Type: GrantFiled: April 10, 1990Date of Patent: July 23, 1991Assignee: Essential Dental Systems, Inc.Inventors: Brett I. Cohen, Allan S. Leutsch, Brahma D. Sharma
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Patent number: 5028638Abstract: In a dental composite containing a polymerizable (meth)acrylic compound, photoinitiator, accelerator, inorganic filler and conventional auxiliaries, the improvement wherein the composite by weight comprises about(a) 10-50% of at least one monomer which contains at least 2 polymerizable (meth)acrylic acid groups,(b) 5-80% of a glass or a glass ceramic which has an average particle size of between about 0.1 and 10 .mu.m and has been post-treated with .gamma.-methacryloxypropyltrimethoxysilane up to a carbon content of between about 0.5 and 2.5% by weight,(c) 2-10% of a surface-treated microfiller and(d) 0.1-5% of a photoactivator consisting of a mixture of camphorquinone and p-dialkylaminobenzenesulphonamide. The composition has a long pot life and good surface color when cured.Type: GrantFiled: January 22, 1990Date of Patent: July 2, 1991Assignee: Bayer AktiengesellschaftInventors: Renate Heid, Jens Winkel, Heiko Herold, Peter Schwabe, Werner Finger, Wolfgang Podszun
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Patent number: 4979989Abstract: A powdered composition for dental impressions, comprising a water-soluble alginate, a gelling agent, a gelling regulator and fillers coated with a hydrolyzed gelatin.Type: GrantFiled: March 3, 1989Date of Patent: December 25, 1990Assignee: Societe Anonyme SanofiInventor: Claude Ridoux
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Patent number: 4970245Abstract: A dental heat-curing silicone composition comprising components A and B obtained by adding inorganic fillers, and if required coloring agents an conventional additives to ingredient of an organopolysiloxane having at least two vinyl groups per molecule, and ingredient of an organohydropolysiloxane having two hydrogen atoms bonded at least to silicone per molecule, and further including 10 parts by weight to 50 parts by weight inclusive of a powder of (neth)acrylate ester homopolymer and/or a (meth)acrylate ester copolymer per a toatl of 100 parts by weight of the components A and B.Type: GrantFiled: February 1, 1989Date of Patent: November 13, 1990Assignee: G-C Dental Industrial Corp.Inventors: Shunichi Futami, Nobuko Okita
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Patent number: 4965295Abstract: In a silicone impression and duplicating composition which undergoes crosslinking at ambient temperature by an addition reaction, comprising(a) an organopolysiloxane possessing two or more vinyl groups in the molecule,(b) optionally an organopolysiloxane without reactive groups,(c) an organopolysiloxane possessing two or more Si-H groups in the molecule,(d) a catalyst,(e) a filler and,(f) optionally an auxiliary and/or colorant, the improvement wherein polysiloxane components (a)-(c) contain not more than about 1.5% by weight of volatile oligomers, whereby the dimensional stability of impressions is improved.Type: GrantFiled: April 12, 1989Date of Patent: October 23, 1990Assignee: Bayer AktiengesellschaftInventors: Peter Schwabe, Ottfried Schlak, Gottfried Knispel, Reiner Voigt
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Patent number: 4962134Abstract: The present invention relates to the addition of aluminum salts of fatty acids with 12 to 18 carbon atoms, particularly aluminum stearate, to dental impression materials on the basis of addition and/or condensation crosslinking organosilicones to improve their structural viscosity behavior and thus to ease their handling for the dentist.Type: GrantFiled: July 14, 1989Date of Patent: October 9, 1990Assignee: Blendax GmbHInventors: Heidrun Ott, Werner Kuhlmann
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Patent number: 4952613Abstract: A dental composition for the treatment of the enamel and/or dentin of the tooth comprising an organic carboxylic acid or an anhydride thereof, a metal chloride and water, the concentration of said organic carboxylic acid or anhydride thereof being 5 to 50 weight percent based on the total weight of said composition, said metal chloride being potassium chloride or calcium chloride or a mixture thereof and the concentration of said metal chloride being 5 to 50 weight percent based on the total weight of said composition. The composition assures an improved bond between the tooth and a filling material such as a composite resin, a pit and fissure sealant, a cementing agent or the like which is used in the treatment of caries, for instance.Type: GrantFiled: September 30, 1988Date of Patent: August 28, 1990Assignee: Kuraray Co., Ltd.Inventor: Hiroyasu Hosoda
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Patent number: 4894396Abstract: A two part impression material comprising a first part comprising a product of the reaction of an alpha, beta-ethylenically unsaturated dicarboxylic acid anhydride and a liquid polydiene resin and a second part comprising a setting agent for the reaction product which setting agent is an alkoxylated fatty monoamine or an alkoxylated fatty polyamine having from 2 to 30 moles of alkoxylate per mole of the fatty amine, the alkoxylate groups being one or more alkoxylates selected from the group comprising ethoxylate, propoxylate and butoxylate, the first part and/or the second part also comprising an organic liquid which is incompatible with both the setting agent and the reaction product. A method of taking a dental impression using the reaction product of the first and second parts of the two part dental impression material is also disclosed.Type: GrantFiled: June 21, 1988Date of Patent: January 16, 1990Assignee: ESPE Stiftung & Co. Produktions- und Vertriebs-KGInventor: Robert G. Fisher
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Patent number: 4891390Abstract: The present invention relates to the addition of aluminum salts of fatty acids with 12 to 18 carbon atoms, particularly aluminum stearate, to dental impression materials on the basis of addition and/or condensation crosslinking organosilicones to improve their structural viscosity behavior and thus to ease their handling for the dentist.Type: GrantFiled: July 3, 1986Date of Patent: January 2, 1990Assignee: Blendax GmbHInventors: Heidrun Ott, Werner Kuhlmann
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Patent number: 4880887Abstract: In curing dental resins, polymerizable compounds having at least one ethylenically unsaturated double bond, such as mono- or poly-functional acrylates or methacrylates are polymerized in the presence of N-cyclohexy-5-ethylpyrimidinetrione, a specific organometallic compound typically including acetylacetone copper or lithium acetate, and an organohalogen compound. The amounts of the ethylpyrimidinetrione, organometallic and organohalogen compounds used are respectively 0.1 to 10 parts by weight, 0.001 to 0.2 parts by weight and 0.1 to 5 parts by weight with respect to the polymerization compounds.Type: GrantFiled: March 3, 1988Date of Patent: November 14, 1989Assignee: G-C Toshi Kogyo CorporationInventor: Akira Hasegawa
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Patent number: 4877854Abstract: A curable composition comprising an unsaturated polyether having terminal alkenyl groups, a linear or branched siloxane-substituted polyether having terminal polyorganosiloxane residues and at least two Si-H groups in the molecule and a catalyst having platinum as the main component has an excellent deep portion curing property and provides a cured body having a good hydrophilic property and a good dimensional reproducibility. This curable composition is especially valuable as a dental impression material.Type: GrantFiled: December 7, 1987Date of Patent: October 31, 1989Assignee: Tokuyama Soda Kabushiki KaishaInventors: Norikazu Hattori, Sunao Urabe, Koshi Kusumoto
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Patent number: 4867790Abstract: An ionogenic compound, soluble or dispersible in aziridine compounds is utilized for delaying the polymerization of aziridine compounds initiated by a sulfonium salt. Said ionogenic compounds contain an anion which is more nucleophilic than the anion present in the sulfonium salt employed. Moreover, a preparation for dental purposes is described which contains these components.Type: GrantFiled: January 27, 1988Date of Patent: September 19, 1989Assignee: ESPE Stiftung & Co. Produktions- und Vertriebs KGInventors: Peter Jochum, Wolf-Dietrich Zahler, Oswald Gasser, Gunther Lechner, Klaus Ellrich
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Patent number: 4836853Abstract: A dental impression composition comprising alginate material and biocidal component.A method for reducing microorganism contamination in alginate dental impressions comprising preparing a mixture comprising alginate, water and biocide.Type: GrantFiled: July 8, 1988Date of Patent: June 6, 1989Assignee: Dentsply GmbHInventor: Hans-Peter K. Gribi
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Patent number: 4813875Abstract: Disclosed is a new urethane polyacrylate having at least one terminal isocyanato acrylic pendent radical. Preferably the molecular chain within the acrylate caps has been extended with a polyhydroxy compound just before final end capping with isocyanato acrylic. The isocyanato acrylic is preferably isocyanato ethyl methacrylate and the urethane is diisocyanate capped polyether and the polyether radical is oxyalkylene. The method for producing the urethane polyacrylate involves end capping a polyol with diisocyanate yielding a reaction product with two reactive equivalents of isocyanate and then capping less than all of the isocyanate with a hydroxyacrylate, after which the remaining isocyanate is reacted with polyol to provide chain extension. The chain extending polyol is then capped with a isocyanato acrylic.Type: GrantFiled: November 26, 1986Date of Patent: March 21, 1989Assignee: Dentsply Research & Development Corp.Inventor: Pamela H. Hare
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Patent number: 4778832Abstract: A dental precise impression material comprises condensation or addition type room temperature-vulcanizing silicone, and further contains 0.1 to 10.0 weight % of at least one protein soluble or slightly soluble in water optionally with 0.05 to 5.0 weight % of at least one hydrophilic nature-affording agent selected from hydrophilic silicone oils and nonionic surface active agents.Type: GrantFiled: June 11, 1987Date of Patent: October 18, 1988Assignee: G-C Dental Industrial Corp.Inventors: Shunichi Futami, Satoshi Terauchi
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Patent number: 4772324Abstract: A dental impression composition is provided which has relatively lower water content for higher tensile and gel strengths, and an effective amount of dipopylene gylcol to offset the reduced amount of water and provide workability in the composition at storage tempering temperatures of as little as 130.degree. F.Type: GrantFiled: May 20, 1986Date of Patent: September 20, 1988Assignee: Van R Dental Products, Inc.Inventors: Don D. Porteous, Ornan Valle
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Patent number: 4766200Abstract: A novel process for providing a thermoplastic polymer having unique thermal characteristics including the step of cooling the polymer during extended mastication until the melt index of the polymer is substantially increased.Type: GrantFiled: December 23, 1986Date of Patent: August 23, 1988Assignee: The Hygenic CorporationInventor: John Riazi
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Patent number: 4761136Abstract: A dental impression material which comprises a pre-polymer formed by reacting a polyol or combination polyester polyol with a diisocyanate, and then with a hydroxyacrylate or hydroxymethacrylate; along with a metal catalyst, plasticizer, photosensitizer, reducing agent, filler and other additives. The essential characteristics of the polymer portion that makes the system work are that it is a long-chain aliphatic polyester-polyurethane molecule, which when endcapped with hydroxy arcylate moieties, is photo-polymerizable to yield a tear-resistant, highly flexible, medium-durometer elastomer, suitable for use as a dental impression material.Type: GrantFiled: August 6, 1987Date of Patent: August 2, 1988Assignee: Kerr Manufacturing CompanyInventors: Narayanan Madhavan, Carole L. Groh, Robert L. Probst
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Patent number: 4759798Abstract: A process for the preparation of dental-technical, dental-medical and medical molding and lining materials including the steps of mixing a substrate selected from the group consisting of a monomeric and/or polymeric or copolymer acrylic or methacrylic ester, a hardening substance for the substrate. Wherein jojoba oil in present in an amount of 0.05 to 10% of total material and the substrate is present in amount of at least about 60% if the total weight of the material.Type: GrantFiled: January 14, 1986Date of Patent: July 26, 1988Inventor: Frauke H. F. von Nostitz
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Patent number: 4732943Abstract: An adhesive for attaching polymeric or polymerizable restorative materials to dentine or other tooth structure, which comprises a polymer of (a) a condensate of .epsilon.-caprolactone with one or more acrylic monomers containing hydroxy groups and (b) a polymer containing binding groups capable of binding to the dentine or other tooth structure, optionally dissolved in a suitable solvent.The adhesive may be used in adhesive compositions including polymerizable monomers, polymerization initiators or fillers.Type: GrantFiled: April 21, 1986Date of Patent: March 22, 1988Assignee: Commonwealth Scientific and Industrial Research OrganizationInventors: Derrick R. Beech, Ezio Rizzardo, Wayne D. Cook, Malcolm C. Smail
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Patent number: 4721735Abstract: Novel compositions, especially light curable compositions, are provided which are coherent, but frangible when cured. Preferred compositions comprising a major proportion of inert, preferably inorganic filler material, polymerizable resin and frangibility enhancing material are provided which are light curable. The materials are particularly useful for "temporary" dental fillings and removable endodontic fillings. The cured materials are easily dissected, comminuted and removed as desired after curing without trauma to the filled teeth.Type: GrantFiled: January 23, 1986Date of Patent: January 26, 1988Assignee: Dentsply Research and Development CorporationInventors: Richard J. Bennett, Robert V. Hare
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Patent number: 4707504Abstract: The use of microporous inorganic fillers in polymerizable compositions, in particular in the dental field, characterized in that the fillers have(a) an average particle size of 0.5 to 50.mu.,(b) a BET-surface area of at least 200 m.sup.2 /g,(c) a pore volume of 0.7 to 5 ml/g and(d) a pore diameter of 10 to 50 nm.Fillings made therefrom are smooth and easy to polish.Type: GrantFiled: August 6, 1985Date of Patent: November 17, 1987Assignee: Bayer AktiengesellschaftInventors: Michael Walkowiak, Klaus Nehren, Wolfgang Podszun, Werner Finger
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Patent number: 4689079Abstract: Powder of chemical material for impression taking and molding for teeth is previously packed with a water-soluble film in an amount determined by each clinical treatment. A desired impression taking or molding material is obtained by putting such pack or packs in a proper amount of water and properly kneading them.Type: GrantFiled: November 12, 1985Date of Patent: August 25, 1987Assignee: Sankin Kogyo Kabushiki KaishaInventors: Mitsuo Buma, Sadayuki Yuda, Masatsune Sato, Mitsuo Okada
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Patent number: 4672081Abstract: A two part impression material suitable for use as a dental impression material comprises a first part containing a product of the reaction of an alpha, beta-ethylenically unsaturated dicarboxylic acid anhydride, such as maleic anhydride, and a liquid polydiene resin, e.g. polybutadiene, and a second part containing a setting agent for the reaction product which setting agent is an alkoxylated fatty mono-amine or an alkoxylated fatty polyamine having from 2 to 30, preferably 5 to 15 moles of alkoxylate per mole of the fatty amine. The alkoxylate groups of the setting agent being one or more groups selected from the group comprising ethoxylate, propoxylate and butoxylate groups. A method of taking a dental impression using the reaction product of the first and second parts of the two part dental impression material is also disclosed.Type: GrantFiled: September 10, 1985Date of Patent: June 9, 1987Assignee: The British Petroleum Company p.l.c.Inventors: Robert G. Fisher, Keith James, Graham M. Pring
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Patent number: 4643678Abstract: A dental application fluid for the inspection of tooth contacts and prosthetic works comprising an organic, polymeric adhesive (such as shellac), a massive component (such as titanium oxide), and a colored pigment (such as heliogen blue) all dispersed or dissolved in an alcoholic solvent.Type: GrantFiled: January 30, 1985Date of Patent: February 17, 1987Assignee: Prodent Ges. Fuer Zahnmed. Bedarfsartikel mbHInventor: Jens M. Hansen
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Patent number: 4632977Abstract: A novel process for providing a thermoplastic polymer having novel thermal characteristics including the critical step of masticating the polymer, either continuously or discontinuously, until the melt index of the polymer is substantially increased.Type: GrantFiled: June 1, 1984Date of Patent: December 30, 1986Assignee: The Hygenic CorporationInventor: John Riazi
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Patent number: 4626558Abstract: Powdered alginate compositions containing polyacrylamide in an amount from about 0.01 to about 0.25 wt. % and having a particle size less than about 300 mesh have enhanced smoothness characteristics, without visible signs of undissolved polymer, upon admixing with water to obtain orally settable, dental impression material.Type: GrantFiled: October 10, 1985Date of Patent: December 2, 1986Assignee: Laclede Professional Products, Inc.Inventor: Michael A. Pellico
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Patent number: 4618664Abstract: A pullulan copolymer obtained by reacting with a polymerizable olefinic compound a pullulan ester which is produced by reacting pullulan with an unsaturated acid to introduce a double bond of carbon thereinto. It is highly hydrophilic and is a material having a high affinity for a living body and which is, therefore, useful for making contact lenses, intraocular lenses, artificial bones and blood vessels, etc.Type: GrantFiled: January 9, 1985Date of Patent: October 21, 1986Assignee: Sadayoshi KamiyaInventor: Yasuhiko Ohnishi
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Patent number: 4609687Abstract: In the making of a shaped structure by mixing(a) a cross-linkable organopolysiloxane,(b) hydrophobic filler particles,(c) paraffin oil,(d) a colorant, and(e) a cross-linking catalyst,the improvement which comprises employing as (b) hydrophobic filler particles of which the surface has been laden with 0.5-5% by weight of paraffin oil. The filler can be present in either or both of a cross-linkable silicone component and a catalyst component; each component can contain other ingredients but will not cure until the two components are brought together. Truer dental impressions are thereby formed.Type: GrantFiled: February 14, 1985Date of Patent: September 2, 1986Assignee: Bayer AktiengesellschaftInventors: Peter Schwabe, Reiner Voigt
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Patent number: 4608088Abstract: A denture adherent preparation in powder form, which comprises an admixture of(a) from about 40-60% dental adhesive(b) from about 60-4% gel-forming mixture of a water-soluble alginate and a setting agent for the water-soluble alginate in an amount effective to cause gelation of an aqueous solution containing the water soluble alginate.The powder composition of the present invention comprising the gel-forming mixture and dental adhesive described above, may also be used as a depot formulation for delivery of therapeutic agents to the oral cavity.Type: GrantFiled: March 22, 1984Date of Patent: August 26, 1986Assignee: Dento-Med Industries IncorporatedInventor: Oddvin Lokken
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Patent number: 4600731Abstract: A paste composition which is used in the preparation of dental impression compositions containing:(a) at least 100 ppm by weight, based on the weight of the paste composition of platinum calculated as the element;(b) 35 to 75 percent by weight, based on the weight of the paste composition, of a diorganopolysiloxane which contains at least 2 SiC-bonded vinyl groups per molecule and has a viscosity of at least 100 mPa.s at 25.degree. C.;(c) 10 to 25 percent by weight, based on the weight of the paste composition, of a hydrocarbon which is liquid or spreadable at room temperature and is free of aliphatic carbon-carbon multiple bonds; and(d) 3 to 15 percent by weight, based on the weight of the paste composition, of hydrophobic silicon dioxide having a surface area of at least 50 m.sup.2 /g;in which the sum of the percentages of (a) to (d) including other additives which may be present in the paste composition is equal to 100 percent.Type: GrantFiled: February 25, 1985Date of Patent: July 15, 1986Assignee: Wacker-Chemie GmbHInventors: Eckhart Louis, Wolfgang Hechtl, Heinz Hefner
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Patent number: 4595713Abstract: A medical implant useful in the regeneration of soft and hard connective tissue, such as cartilage and bone, is disclosed which comprises a copolymer of a major amount of epsilon caprolactone and a minor amount of lactide. Where regeneration of bone tissue, in particular, is desired, the copolymer may further include osteogenic material in powdered or particulate form. If soft tissue regeneration is desired, the copolymer may include chopped carbon fiber. A mass of the copolymer, optionally including additives, may be molded by hand by heating the polymer to a temperature of 115.degree.-160.degree. F., by, for example, immersion in hot water. The mass is then molded to the void to be filled or shape the regenerated tissue is desired to assume, and implanted in the patient. The mass is gradually replaced by regenerated tissue.Type: GrantFiled: January 22, 1985Date of Patent: June 17, 1986Assignee: Hexcel CorporationInventor: Kenneth St. John
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Patent number: 4574793Abstract: Stabilized, catalyzed polyurethane systems are disclosed which are comprised of a polyurethane prepolymer, a tertiary amine catalyst and a stabilizing agent. To extend shelf life, and lend stability to the composition, the stabilizing agent is comprised of methane sulfonic acid. The stabilizer is suitable for use with most polyurethane systems catalyzed by tertiary amines, and produces longer shelf life or stability with lesser amounts than conventional stabilizers.In a particular embodiment requiring extended shelf life but quick curing times, a catalyst yielding these qualities is bis(2,6-dimethylmorpholino)diethylether. The catalyst, when incorporated in a polyurethane prepolymer coated on a flexible substrate, can be immersed in water, the material thereafter being wrapped about the portion of the patient's body to be immobilized, and cures rapidly, within about 15 minutes. The catalyst can optionally be combined with a stabilizer, such as methane sulfonic acid.Type: GrantFiled: August 21, 1984Date of Patent: March 11, 1986Assignee: Hexcel CorporationInventors: Kyu-Wang Lee, Winston L. Hedges, Kenneth S. Baron
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Patent number: 4568707Abstract: In a polysiloxane-based composition which crosslink by addition, comprising (a) an organosiloxane with two or more vinyl groups in the molecule, (b) and organo-hydridopolysiloxane, as a crosslinking agent, (c) a catalyst for accelerating the addition reaction, (d) a hydrophobic filler and (e) optionally a dyestuff pigment, the improvement which comprises (f) hydrogenated castor oil as a structuring agent. The composition is highly viscous and will not run but can readily be stirred.Type: GrantFiled: March 12, 1985Date of Patent: February 4, 1986Assignee: Bayer AktiengesellschaftInventors: Reiner Voigt, Peter Schwabe
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Patent number: 4554336Abstract: A trifunctional methacrylate or acrylic terminated urethane resin of the following chemical structure: ##STR1## Where: R.sub.1 is --H, --CH.sub.3, --CH.sub.2 CH.sub.3, or --CH.sub.2 CH.sub.2 CH.sub.3,R.sub.2 is (--CH.sub.2 CH.sub.2 --O--).sub.n or ##STR2## where: n=2 to 10, R.sub.3 is a divalent organic radical obtained by removal of two isocyanato groups from an organic diisocyanate,R.sub.4 is methylene, ethylene or propylene, andR.sub.5 is --H, or --CH.sub.3.Type: GrantFiled: October 28, 1983Date of Patent: November 19, 1985Assignee: Sybron CorporationInventors: Patrick D. Kidd, Terry L. Sterrett
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Patent number: 4544467Abstract: Light-curable dentin and enamel adhesives comprising phosphorus-containing polymerizable monomer, sulfur compound having sulfur in the .sup.+2 or .sup.+4 oxidation state, selected photoinitiators, and an optional peroxide compound, as well as one-step and two-step curing methods.Type: GrantFiled: June 28, 1983Date of Patent: October 1, 1985Assignee: Minnesota Mining and Manufacturing CompanyInventors: James E. Bunker, Richard P. Fields
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Patent number: 4543372Abstract: A low dusting powdery alginate impression material for dental use is disclosed which comprises:(a) an alginate,(b) a gelling agent,(c) a gelation controlling agent,(d) a filler,(e) at least one hydrophobic liquid having a vapor pressure of not higher than 3.15 mmHg at 20.degree. C. selected from the group consisting of a hydrocarbon and a silicone oil not containing a hydrophilic group,(f) polyvinylpyrrolidone, and(g) at least one compound selected from the group consisting of oxides, hydroxides and fluorides of metals.With the alginate impression material, gypsum models prepared using the negative mold of an impression have high surface precision and impressions of oral cavity having high precision can be obtained as well as substantially no dust formation is observed when taken out of a storage container and during mixing with water.Type: GrantFiled: October 26, 1984Date of Patent: September 24, 1985Assignee: G-C Dental Industrial Corp.Inventors: Kazuhiro Watanabe, Sakae Yoshikawa, Shunichi Futami
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Patent number: 4542167Abstract: A water-hardenable dental cement composition comprising hydroxyapatite [Ca.sub.10 (PO.sub.4).sub.6 (OH).sub.2 ] as the main component and an inorganic powder and a hardening agent.Type: GrantFiled: May 1, 1984Date of Patent: September 17, 1985Inventor: Hideki Aoki
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Patent number: 4540723Abstract: A dental restorative composition containing a monofunctional aromatic or cycloaliphatic acrylate or methacrylate, such as benzyl methacrylate.Type: GrantFiled: May 16, 1984Date of Patent: September 10, 1985Assignee: J&J Dental Products Inc.Inventor: Lincoln Ying
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Patent number: 4540722Abstract: Dental liner and primer compositions having improved adhesion to dentin and containing a metal dissolved in a polar organic solvent, said metal being selected from Fe, Cu, Mn, Co, Sn, Cr, Ni, and Zn.Type: GrantFiled: January 15, 1982Date of Patent: September 10, 1985Assignee: Minnesota Mining and Manufacturing CompanyInventor: James E. Bunker
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Patent number: 4532268Abstract: Imidazoles in dissolved form act as an agent for retarding the gelation of the polymerization of aziridine compounds initiated with sulfonium salts. The composition is particularly useful in dentistry applications, such as in the preparation of impressions and provisional denture parts.Type: GrantFiled: December 1, 1983Date of Patent: July 30, 1985Assignee: ESPE, Fabrik pharmazeutischer Praparate GmbHInventors: Peter Jochum, Heijo Hubner, Oswald Gasser