Patents Assigned to American Dental Association Foundation
  • Patent number: 9883923
    Abstract: Disclosed are endodontic filling materials and methods. A method for filling a dental root canal may include providing a hydrosetting filling material and inserting the hydrosetting filling material into the dental root canal, the material setting in the root canal to form a biocompatible filling. The hydrosetting filling material comprises a hydrogel former and a filler. The hydrogel former is at least one of a reactive organic hydrogel formers, an inorganic hydrogel formers, and a non-reactive organic hydrogel formers, and the filler is at least one of a self-hardening and a non-hardening filler. Plural filling material precursor compositions that collectively contain hydrogel formers and fillers may be provided.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: February 6, 2018
    Assignee: AMERICAN DENTAL ASSOCIATION FOUNDATION
    Inventors: Laurence C Chow, Shozo Takagi
  • Patent number: 9775694
    Abstract: A material deposition device includes a solution supply component, a gas supply component, and a co-axial discharge mechanism. The co-axial discharge mechanism includes a solution discharge mechanism, and a gas discharge mechanism co-axial with the solution discharge mechanism. The material deposition device further includes an alignment component that aligns the solution discharge mechanism in a center of the gas discharge mechanism; and an orifice plate with a number of turbulence inducing structures that induce turbulence in gas exiting the gas discharge mechanism.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: October 3, 2017
    Assignee: American Dental Association Foundation
    Inventor: Wojtek Tutak
  • Patent number: 8557038
    Abstract: Disclosed are dual-phase cement precursor systems and associated methods and kits. The cement precursor systems comprises at least first and second phases each containing a calcium phosphate compound. When mixed, the first and second cement precursor phases form a biocompatible cement. The disclosed systems include an organic acid in an amount effective to enhance the working time of the cement precursor composition, and also include a setting accelerator. In some embodiments, one or more of the calcium phosphate compounds is provided in the form of particles with a nonmonomial particle sized distribution.
    Type: Grant
    Filed: April 22, 2010
    Date of Patent: October 15, 2013
    Assignee: American Dental Association Foundation
    Inventors: Laurence C. Chow, Shozo Takagi
  • Publication number: 20100269736
    Abstract: Disclosed are dual-phase cement precursor systems and associated methods and kits. The cement precursor systems comprises at least first and second phases each containing a calcium phosphate compound. When mixed, the first and second cement precursor phases form a biocompatible cement. The disclosed systems include an organic acid in an amount effective to enhance the working time of the cement precursor composition, and also include a setting accelerator. In some embodiments, one or more of the calcium phosphate compounds is provided in the form of particles with a nonmonomial particle sized distribution.
    Type: Application
    Filed: April 22, 2010
    Publication date: October 28, 2010
    Applicant: American Dental Association Foundation
    Inventors: Laurence C. Chow, Shozo Takagi
  • Publication number: 20100247605
    Abstract: Living cellular material is encapsulated or placed in a protective material (cell protector) which is biocompatible, biodegradable and has a three-dimensional form. The three dimensional form is incorporated into a matrix that maybe implanted in vivo, ultimately degrade and thereby by replaced by living cell generated material.
    Type: Application
    Filed: May 10, 2010
    Publication date: September 30, 2010
    Applicant: American Dental Association Foundation
    Inventors: Huakun Xu, Michael D. Weir
  • Publication number: 20100081362
    Abstract: A method and apparatus for measuring the polishability of a solid material such as a dental restorative material includes using a series of apparatus to perform the steps of forming the material into a desired specimen with a generally planar surface, conditioning the surface by abrasion, measuring the abraded surface with a profile determination device, optionally measuring the amount of material abraded from the surface and the gloss of the abraded surface, polishing a portion of the abraded surface with a polishing device at a controlled load for a pre-determined time and measuring the roughness and/or gloss of the polished surface followed by comparison thereof to the corresponding measurements of the unpolished, conditioned portion of the specimen surface. Polishing materials and devices may also be tested using the apparatus and method for polishing a standardized material.
    Type: Application
    Filed: September 30, 2009
    Publication date: April 1, 2010
    Applicant: American Dental Association Foundation
    Inventors: Nikola Njegovan, Spiro Megremis, Olga Sirovskaya, Hank Shepelak
  • Patent number: 7670579
    Abstract: Nano-particles of calcium and phosphorous compounds are made in a highly pure generally amorphous state by spray drying a weak acid solution of said compound and evaporating the liquid from the atomized spray in a heated column followed by collection of the precipitated particles. Hydroxyapatite (HA) particles formed by such apparatus and methods are examples of particle manufacture useful in bone and dental therapies. Dual nozzle spraying techniques are utilized for generally insoluble compounds.
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: March 2, 2010
    Assignee: American Dental Association Foundation
    Inventors: Laurence C. Chow, Limin Sun
  • Patent number: 7632878
    Abstract: Combining nanosized particles of a source of desired dental restorative, repair or therapeutic materials with strengthening agents in various generally nanosized form such as whiskers, fibers, particles and the like in a resin matrix provides a highly strain resistant composite which more effectively releases the therapeutic agents. The utilization of nano sized particles of the therapeutic agent in the combination enables observation of significantly improved therapeutic results.
    Type: Grant
    Filed: October 17, 2008
    Date of Patent: December 15, 2009
    Assignee: American Dental Association Foundation
    Inventors: Huakun Xu, Limin Sun, Shozo Takagi, Laurence C. Chow
  • Publication number: 20090035378
    Abstract: Nano-particles of calcium and phosphorous compounds are made in a highly pure generally amorphous state by spray drying a weak acid solution of said compound and evaporating the liquid from the atomized spray in a heated column followed by collection of the precipitated particles. Hydroxyapatite (HA) particles formed by such apparatus and methods are examples of particle manufacture useful in bone and dental therapies. Dual nozzle spraying techniques are utilized for generally insoluble compounds.
    Type: Application
    Filed: September 16, 2008
    Publication date: February 5, 2009
    Applicant: American Dental Association Foundation
    Inventors: Laurence C. Chow, Limin Sun
  • Patent number: 7390335
    Abstract: Nano-particles of calcium and phosphorous compounds are made in a highly pure generally amorphous state by spray drying a weak acid solution of said compound and evaporating the liquid from the atomized spray in a heated column followed by collection of the precipitated particles. Hydroxy apetite (HA) particles formed by such apparatus and methods are examples of particle manufacture useful in bone and dental therapies.
    Type: Grant
    Filed: April 6, 2005
    Date of Patent: June 24, 2008
    Assignee: American Dental Association Foundation
    Inventor: Laurence C. Chow
  • Publication number: 20060110340
    Abstract: Kits and methods that combine whitening/stain removal of teeth with remineralization are disclosed. These kits advantageously comprise separate compositions comprising a soluble calcium salt, a soluble orthophosphate salt, and a soluble peroxide, in order to optimize the stability of these components for storage and/or the activity of these components upon use. The active ingredients may also be separated in a solid composition (e.g., a powder) or in a stable dispersion comprising a non-aqueous dispersion medium.
    Type: Application
    Filed: November 24, 2004
    Publication date: May 25, 2006
    Applicant: American Dental Association Foundation
    Inventor: Ming Tung
  • Publication number: 20060110306
    Abstract: Nano-particles of calcium and phosphorous compounds are made in a highly pure generally amorphous state by spray drying a weak acid solution of said compound and evaporating the liquid from the atomized spray in a heated colunm followed by collection of the precipitated particles. Hydroxyapatite (HA) particles formed by such apparatus and methods are examples of particle manufacture useful in bone and dental therapies. Dual nozzle spraying etechniques are utilized for generally insoluble compounds.
    Type: Application
    Filed: September 16, 2005
    Publication date: May 25, 2006
    Applicant: American Dental Association Foundation
    Inventors: Laurence Chow, Limin Sun
  • Publication number: 20050249654
    Abstract: Nano-particles of calcium and phosphorous compounds are made in a highly pure generally amorphous state by spray drying a weak acid solution of said compound and evaporating the liquid from the atomized spray in a heated column followed by collection of the precipitated particles. Hydroxy apetite (HA) particles formed by such apparatus and methods are examples of particle manufacture useful in bone and dental therapies.
    Type: Application
    Filed: April 6, 2005
    Publication date: November 10, 2005
    Applicant: American Dental Association Foundation
    Inventor: Laurence Chow
  • Patent number: 6955716
    Abstract: A bone replacement material and therapy comprises the combination of calcium phosphate compounds and two or more soluble fillers in the form of fibers, mesh or other materials which have the dual functions of reinforcing an in vivo implant while dissolving at a programmed rate to form macropores capable of receiving natural bone ingrowth.
    Type: Grant
    Filed: March 1, 2002
    Date of Patent: October 18, 2005
    Assignee: American Dental Association Foundation
    Inventors: Huakun Xu, Laurence C. Chow, Shozo Takagi, Frederick C. Eichmiller
  • Patent number: 6871550
    Abstract: An apparatus and method for measuring the characteristics of curing polymers. The apparatus and method utilize cantilever beam technology to determine characteristics of polymers during the curing process, including but not limited to, stress-related forces that develop during the polymer curing process. The apparatus and method also provide for controlling and monitoring environmental conditions during the curing process.
    Type: Grant
    Filed: August 14, 2003
    Date of Patent: March 29, 2005
    Assignee: American Dental Association Foundation
    Inventor: Frederick C. Eichmiller
  • Publication number: 20040154407
    Abstract: An apparatus and method for measuring the characteristics of curing polymers. The apparatus and method utilize cantilever beam technology to determine characteristics of polymers during the curing process, including but not limited to, stress-related forces that develop during the polymer curing process. The apparatus and method also provide for controlling and monitoring environmental conditions during the curing process.
    Type: Application
    Filed: August 14, 2003
    Publication date: August 12, 2004
    Applicant: AMERICAN DENTAL ASSOCIATION FOUNDATION
    Inventor: Frederick C. Eichmiller