By Post Patents (Class 433/220)
  • Patent number: 10874488
    Abstract: A dental anchoring system includes an angled abutment, having a main body extending from a top to a channel body, the channel body extending away from the main body at a predetermined angle less than 180 degrees; a lip extending around the top; and an opening extending from the top and through the channel body, the opening to receive an attachment device; the angled abutment is to provide an angled attachment for a dental prosthetic.
    Type: Grant
    Filed: February 7, 2020
    Date of Patent: December 29, 2020
    Inventor: Ankur Dahiya
  • Patent number: 10872212
    Abstract: A microchip denture implant and reader system includes a microchip having a transceiver 1150 or transmitter-receiver pair for transmitting a wireless signal containing information relating to a user, and an external reader scanner 130 in communication with the microchip. The microchip mounts in a dental prosthetic item for oral use. The external reader when activated can scan and display or otherwise provide access to the information relating to the user. The microchip and dental prosthetic item, when installed in the mouth of the user, are configured to provide access to the information relating to the user at a given time.
    Type: Grant
    Filed: April 17, 2019
    Date of Patent: December 22, 2020
    Inventor: Vahid Danaei-Moghaddam
  • Patent number: 10221295
    Abstract: Block for use in a CAD/CAM system for the manufacture of a dental restauration, said block consisting of a thermoplastic polymer comprising PEEK including radiopaque particles selected from the group comprising BaZrO3, YbF3, Yb2O3, SrO, SrZrO3, SiO2—ZrO2, SiO2—Yb2O3, Lu2O3, LuF3.
    Type: Grant
    Filed: April 7, 2016
    Date of Patent: March 5, 2019
    Assignees: SOCIETE DE RECHERCHES TECHNIQUES DENTAIRES—RTD, SUKGYUNG AT CO., LTD
    Inventors: Pierre-Luc Reynaud, Manh-Quynh Chu, Hyung Sup Lim, Hyung Jun Lim, Young Cheol Yoo
  • Patent number: 10136968
    Abstract: The present invention relates to devices, kits, and methods for planning and carrying out surgical interventions and/or radiographic imaging, particularly dental implant radiographic imaging or surgical interventions.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: November 27, 2018
    Assignee: ISETHCO LLC
    Inventors: Ingram Chodorow, Ryan Held
  • Patent number: 10052183
    Abstract: A dental post has fibre-reinforced material with substantially uniformly directed fibers and mountable in a tooth root canal for fixing a dental prosthetic structure on a tooth stump and a method for its fabrication. For improving the light conduction properties within the post, at least a fraction of the fibers conduct light, and includes post a tapered portion extending toward its second end. Some of the fibers extend from the first end of said post to the circumferential surface of the tapered portion. According to a fabrication method of the post a composite structure of uniform cross-section with substantially uniformly directed light conducting fibers in a pultrusion process. At least a portion of the circumferential surface of the composite structure is shaped to provide a tapered portion extending toward the second end of said composite structure.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: August 21, 2018
    Inventors: Harald Nordin, Peter Nordin
  • Patent number: 9770247
    Abstract: The shank (12) of a disposable rotary cutting tool (10) comprises a pipe section (16) cut from a drawn metal pipe. The tool head (14) is formed from a cut-out (18a, 18b) of a drawn metal sheet or a section of a metal tube by non-cutting machining. The pipe section (16) and the tool head (14) are advantageously attached by force fitting.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: September 26, 2017
    Assignee: Straumann Holding AG
    Inventor: Stephane Courvoisier
  • Patent number: 9707060
    Abstract: Endodontically treated teeth can be restored with porcelain facial veneer restorations-layering ceramic and porcelains. The method includes the steps of providing a cement material for preventing microleakage into gutta percha and for forming a post-barrier space. A rhomboid access inlay-shaped porcelain core is provided with an anatomical post extension extending below a level of an existing crest of bone into a root canal space, the length of the post extension being less than one-half the length of a root canal. The modified post is seated into a post barrier cement to prevent the egress of moisture or bacterial microleakage to the apex of the root canal.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: July 18, 2017
    Inventor: Jack Levi
  • Patent number: 9668831
    Abstract: The invention concerns a dental prosthesis (1), in particular on implants, for the replacement of an entire dental arch and a method and a kit for making it. The dental prosthesis (1) comprises a structure (2) having a chewing portion (4) which can be substantially in the shape of a tooth or in the shape of a dental arch. The chewing portion (4) develops according to a direction of main development (X) between a contact edge (4a) suitable for engaging the tissues of the patient and a chewing edge (4b) opposite the contact edge (4a). The dental prosthesis (1) further comprises a plurality of hooking elements integrated in the structure (2) and can be engaged in respective endosteal implants applied in the mouth of a patient.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: June 6, 2017
    Assignee: MICRO.MEDICA S.r.l.
    Inventors: Giuseppe Cirronis, Alessandra Paderno
  • Patent number: 9351805
    Abstract: An In-situ Tooth Filling System and Method Utilizing External Curing Step. The method and system utilizes the heat-/light-/vacuum-curing process normally available only in a dental laboratory. Like the conventional dental prosthetic production process, the filling is attached to the tooth void utilizing curable cement. Unlike the conventional (indirect) method, however, the instant method is completed totally within a single appointment in the dentist's office. The system utilizes fill stems that are made from curable filling material. These stems will become a part of the filling when the filling is cured. The filling is partially cured and then removed from the tooth for final curing in a vacuum oven that heat- and/or light-cures the filling.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: May 31, 2016
    Inventor: Hamid Kheradmandnia
  • Publication number: 20150099238
    Abstract: The disclosure relates to dental prostheses assemblies. Specifically, the disclosure relates to retrievable detent-retained dental prostheses assemblies, kits and methods of their use in the restoration and rehabilitation.
    Type: Application
    Filed: October 8, 2014
    Publication date: April 9, 2015
    Inventor: Milka Chesler
  • Patent number: 8974229
    Abstract: A method of virtually designing a post and core restoration for attachment in a damaged tooth of a patient, where the tooth includes a bore for receiving the post of the post and core, the method includes obtaining a first 3D scan includes at least a part of the damaged tooth; providing a digital 3D shape adapted to fit the bore of the damaged tooth; virtually matching the first 3D scan of the tooth and the digital 3D shape, where the matching includes matching a surface region in the first 3D scan of the tooth with a corresponding surface region of the digital 3D shape, such that at least part digital 3D shape is represented relative to the first 3D scan of the tooth; and virtually designing the post and core restoration based on the representation of the digital 3D shape relative to the first 3D scan of the tooth.
    Type: Grant
    Filed: February 7, 2013
    Date of Patent: March 10, 2015
    Assignee: 3Shape A/S
    Inventors: Rune Fisker, Sven Nonboe
  • Publication number: 20140248586
    Abstract: The invention is about the dental post system designed to protect the dental tissues left and is aimed to use for the treatment of teeth with excessive dental material loss in the fields of endodontic, prosthetic dental treatment and pedodontics.
    Type: Application
    Filed: November 6, 2012
    Publication date: September 4, 2014
    Inventor: Akman Serhan
  • Publication number: 20140147815
    Abstract: A prefabricated, hybrid dental pulp organ replacement system has a tube-like core device formed as a substantially cylindrical sleeve formed of a high-strength, high-density material, having a coronal end and an apical end and configured to be partially inserted and fixed at its apical end to a root cavity. The system also has a root device forming a low-density, low-strength volume, including an apical portion formed in an inner volume of a root cavity of a tooth under restoration and a coronal portion extending slightly above a cement-enamel junction of the tooth. The high density core component redirects mechanical forces imposed thereon into a root periphery of a tooth to prevent the forces away from an axial center of the root while protecting the portion of the low density volume surrounded by the jacket from deleterious forces and fluids.
    Type: Application
    Filed: November 24, 2012
    Publication date: May 29, 2014
    Inventors: Robert Sicurelli, Samuel Masyr
  • Publication number: 20130209965
    Abstract: A method of virtually designing a post and core restoration for attachment in a damaged tooth of a patient, where the tooth includes a bore for receiving the post of the post and core, the method includes obtaining a first 3D scan includes at least a part of the damaged tooth; providing a digital 3D shape adapted to fit the bore of the damaged tooth; virtually matching the first 3D scan of the tooth and the digital 3D shape, where the matching includes matching a surface region in the first 3D scan of the tooth with a corresponding surface region of the digital 3D shape, such that at least part digital 3D shape is represented relative to the first 3D scan of the tooth; and virtually designing the post and core restoration based on the representation of the digital 3D shape relative to the first 3D scan of the tooth.
    Type: Application
    Filed: February 7, 2013
    Publication date: August 15, 2013
    Applicant: 3Shape A/S
    Inventor: 3Shape A/S
  • Publication number: 20130071814
    Abstract: The present invention pertains to the technical field of dental restorations, especially dental posts. One aspect of the present invention is a radio-opaque coated dental post. The post essentially consists of a core embedded in a thermoplastic or duroplastic material. The core is further coated with yet another resin with at least one radio-opaque additive. X-ray visibility especially at the outer margin of the post is significantly improved.
    Type: Application
    Filed: May 31, 2011
    Publication date: March 21, 2013
    Applicant: COLTÈNE/WHALEDENT AG
    Inventors: Ralf Boehner, Werner Mannschedel
  • Patent number: 8398403
    Abstract: The tooth root channel anchorage assembly comprises a core member to be fixed within the tooth root channel and a post to be inserted into the core member having a thoroughgoing bore. The core member comprises a crown part and an anchorage part to be fixed within the root canal, the surface of the anchorage part having a substantially hyperbolic form. Preferably the crown part of the core member as well as a part of the surface of the post have also a substantially hyperbolic form. The hyperbolic form allows a better anchoring and distributing of the load, thus reducing the danger of breaking of the post and root canal, still allowing the access to the root canal before the post is inserted.
    Type: Grant
    Filed: November 20, 2007
    Date of Patent: March 19, 2013
    Inventors: Harald Nordin, Peter Nordin
  • Publication number: 20130059270
    Abstract: A device for preparing, fitting, and placing periodontal prosthodontics having a finger covering and an attached bilayered adhesive patch, wherein the bilayered adhesive patch comprises two separable layers joined by a weak adhesive and one external side of the bilayered adhesive patch is attached by a strong adhesive to the finger covering while the other external side of the bilayered adhesive patch has a layer of pressure sensitive adhesive.
    Type: Application
    Filed: September 1, 2011
    Publication date: March 7, 2013
    Inventor: Mike Zacher
  • Patent number: 8298973
    Abstract: A glass thread adapted for reinforcing polymeric materials includes a plurality of filaments having a chemical composition that includes the following constituents within the limits defined below in weight percent: SiO2 40 to 60 Al2O3 0 to 5 CaO 1 to 15 MgO 1 to 15 BaO 2 to 15 SrO 12 to 20 ZnO 0.5 to 10 Na2O + K2O + Li2O 0 to 5 TiO2 3 to 20 Prosthetic members including such threads are also described.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: October 30, 2012
    Assignee: Societe de Recherches Techniques Dentaires—R.T.D.
    Inventors: Anne Berthereau, Jerome Blaizot
  • Patent number: 8298664
    Abstract: A dental material comprising a symmetrically rod-shaped fiber-reinforced composite comprising at least two layers of preimpregnated fibers, wherein the preimpregnated fibers comprise fibers coated with a resin, wherein the layers are unbraided, and wherein each layer is unidirectionally disposed on the preceding layer in a direction that is different from the direction of the preceding layer. The rod-shaped composite may be hollow and contain a channel throughout the axial length of the rod or may contain a shaft or other material that is inserted into the channel.
    Type: Grant
    Filed: April 12, 2007
    Date of Patent: October 30, 2012
    Assignee: Pentron Clinical Technologies, LLC
    Inventor: Weitao Jia
  • Publication number: 20120202173
    Abstract: Root canal abutment devices and methods which facilitate the adjustment or removal of an oral appliance, e.g., a crown or bridge, from a reconfigurable abutment assembly are described. The adjustable abutment assembly may be secured within a pulp chamber of a pre-existing tooth. The abutment assembly has a projecting abutment portion with one or more shape memory alloy sleeves or plates or elements extending along the abutment. Each of the sleeves has a length with at least one curved or arcuate portion. Energy may be applied to the elements such that the arcuate portion flattens to allow for the oral appliance to be placed thereupon while removal of the energy allows the elements to reconfigure into its curved configuration thereby locking the oral appliance to the abutment. Removal of the oral appliance may be effected by reapplication of energy to the elements.
    Type: Application
    Filed: February 4, 2011
    Publication date: August 9, 2012
    Applicant: Rodo Medical, Inc.
    Inventors: Young SEO, Jianhua YANG, Victor CHECHELSKI, Jong Gil PARK
  • Patent number: 8227018
    Abstract: A method of manufacturing a dental post according to the present invention comprises the steps of: (i) overjacketing extrusion of at least one thermoplastic material over at least one filament or yarn, such that the thermoplastic material cross-sectionally enwraps the at least one filament or yarn; (ii) solidifying the extruded product of step (i); (iii) equipping the solidified extruded product of step (ii) with a surface texture, such that the thermoplastic wrapping is not modified in a way as to expose or damage the at least one filament or yarn. The invention allows for more flexibility in the manufacturing of dental posts, especially in generating surface textures of such dental posts.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: July 24, 2012
    Assignee: Coltene Whaledent AG
    Inventors: Werner Mannschedel, Ralf Bohner, Barbara Muller
  • Publication number: 20120178052
    Abstract: An artificial tooth includes an internal crown member and an external crown member. The internal crown member includes a recess and a peg. The recess is formed in a top surface of the internal crown member. The peg is formed in the recess. The peg has a top end forming a retention block. The external crown member forms a resilient cap. The resilient cap is formed at a location corresponding to the retention block and can be fit over the retention block to form clamping engagement therebetween. When the external crown member is fit over the internal crown member, the resilient cap encloses and clamps the retention block.
    Type: Application
    Filed: May 10, 2011
    Publication date: July 12, 2012
    Inventor: TAI-WU LIN
  • Patent number: 8197256
    Abstract: A fiber optics dental post includes a resin body and plural fiber optics center shafts; wherein the resin body includes an outer peripheral face, a receiving irradiation portion, and a bottom; each of the fiber optics center shafts pierces through and is fixed in the resin body, and has a receiving irradiation end and a light-guide irradiation end; each receiving irradiation end placed on the receiving irradiation portion of the resin body is used to receive the light irradiating on the receiving irradiation portion, and each light-guide irradiation end is respectively placed on the outer peripheral face and at the bottom of the resin body, thus the light received by each receiving irradiation end is propagated to the outer peripheral face and the bottom of the resin body through the light-guide irradiation end for irradiation, so as to effectively enhance the adhesion strength of the dental post.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: June 12, 2012
    Assignee: Taiwan Fiber Optics, Inc.
    Inventor: Luke Lu
  • Publication number: 20110300511
    Abstract: A fiber-reinforced composite post having an inner core section or rod fabricated of fibers impregnated in a resin matrix and an outer sheath of fibers arranged in the form of a mesh. The outer sheath comprises an interior and an exterior surface, the exterior surface is dry and unembedded fibers, and the outer sheath is attached to the inner core. In an embodiment of the dental post, the interior surface of the mesh is embedded in the resin matrix of the inner core with the inner core fibers.
    Type: Application
    Filed: August 15, 2011
    Publication date: December 8, 2011
    Applicant: PENTRON CLINICAL TECHNOLOGIES, LLC
    Inventor: Ajit Karmaker
  • Patent number: 7998375
    Abstract: Fiber-reinforced composite posts are produced having high strength and high radiopacity. In a method of manufacturing the fiber-reinforced composite posts, fibers are pulled through filled resin and heat is applied at various steps in the process to provide high strength and optimal radiopacity.
    Type: Grant
    Filed: November 29, 2007
    Date of Patent: August 16, 2011
    Assignee: Pentron Clinical Technologies, LLC
    Inventors: Ajit Karmaker, Mike Karlak, Weitao Jia
  • Patent number: 7997901
    Abstract: A fiber-reinforced composite post having an inner core section or rod fabricated of fibers impregnated in a resin matrix and an out sheath of fibers arranged in the form of a mesh. The sheath comprises an interior and an exterior surface, whereby the interior surface is attached to and embedded in the resin matrix of the rod and the exterior surface has dry, unimpregnated fibers.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: August 16, 2011
    Assignee: Pentron Clinical Technologies, LLC
    Inventor: Ajit Karmaker
  • Publication number: 20110123959
    Abstract: A dental core and post system for restoration of teeth includes a core device and a dental post formed as a rod-like member extending along a central vertical axis between a coronal end and an apical end. At least one portion of the rod-like member including the apical end is configured for fixation within a root canal of a tooth for restoration. The core device is attached to or is integral with the coronal end of the dental post. At least one of the core device and dental post include an inner, low-density volume configured to limit mechanical forces communicated through the core device and dental post coaxially with the central vertical post axis after fixation.
    Type: Application
    Filed: November 24, 2009
    Publication date: May 26, 2011
    Inventors: Robert Sicurelli, Samuel Masyr
  • Patent number: 7726971
    Abstract: A dental post includes a composite material such as long fibers embedded in a resin matrix, and is able to transmit visible radiation when it is lit by a dental lamp to ensure polymerization of a product for setting in a tooth's root canal. The post, which has a specific color determined at ambient temperature before insertion into said canal, and which contains at least one thermochromic substance able to provide said specific color, loses its color when in place in the canal. A method for forming the dental post and a kit including a plurality of dental posts and drills are also disclosed.
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: June 1, 2010
    Assignee: Societe de Recherches et Techniques Dentaires-R.T.D.
    Inventors: Manh-Quynh Chu, Pierre-Luc Reynaud
  • Publication number: 20100084778
    Abstract: A method of manufacturing a dental post according to the present invention comprises the steps of: (i) overjacketing extrusion of at least one thermoplastic material over at least one filament or yarn, such that the thermoplastic material cross-sectionally enwraps the at least one filament or yarn; (ii) solidifying the extruded product of step (i); (iii) equipping the solidified extruded product of step (ii) with a surface texture, such that the thermoplastic wrapping is not modified in a way as to expose or dam-age the at least one filament or yarn. The invention allows for more flexibility in the manufacturing of dental posts, especially in generating surface textures of such dental posts.
    Type: Application
    Filed: October 2, 2008
    Publication date: April 8, 2010
    Applicant: COLTENE WHALEDENT AG
    Inventors: Werner Mannschedel, Ralf Bohner, Barbara Muller
  • Publication number: 20100035214
    Abstract: The invention relates to a prefabricated radio-opaque dental prosthetic member made of a composite material that comprises fibres embedded in a resin, said resin containing at least one radio-opaque component, characterized in that the radio-opaque component consists of nanoparticles having a size lower than 50 nm in order to transmit a portion or the totality of the wavelengths ranging from 400 to 600 nm of an incident radiation.
    Type: Application
    Filed: January 18, 2008
    Publication date: February 11, 2010
    Applicant: Societe De Recherches Techniques Dentaires - R.T.D
    Inventors: Pierre-Luc Reynaud, Manh-Quynh Chu
  • Publication number: 20090325130
    Abstract: A canal anchoring post formed by a single composite material comprising at least an organic matrix, particles and fibers. The particles and fibers are distributed in the organic matrix with respective volume proportions varying progressively and radially from the central longitudinal axis to the periphery of said post. In addition, the respective variations of the volume proportions of particles and fibers are opposite and the sum of the volume proportions of particles and fibers is radially constant from the central longitudinal axis to the periphery of said post.
    Type: Application
    Filed: June 30, 2008
    Publication date: December 31, 2009
    Applicants: BERNARD MANEUF, BRUNO CLUNET-COSTE, ANDRE COLLOMBIN
    Inventors: Yannick Le Guay, Bruno Clunet-Coste
  • Publication number: 20090246738
    Abstract: A fiber-reinforced composite post having an inner core section or rod fabricated of fibers impregnated in a resin matrix and an out sheath of fibers arranged in the form of a mesh. The sheath comprises an interior and an exterior surface, whereby the interior surface is attached to and embedded in the resin matrix of the rod and the exterior surface has dry, unimpregnated fibers.
    Type: Application
    Filed: March 25, 2008
    Publication date: October 1, 2009
    Applicant: Pentron Clinical Technologies, LLC
    Inventor: Ajit Karmaker
  • Patent number: 7556500
    Abstract: Bone-adaptive surface structures are provided for lateral jaw implants. Micromechanical and/or macromechanical surface structures having various body forms are incorporated into selected segments of the surface of a base and of a bar that connects a shaft with the base to accelerate the healing process after the implant is inserted into the jaw bone and to make a critical improvement in holding the implant firmly in place without rotation. A process of manufacturing the surface structures includes forming a macromechanical surface on the implant to increase its surface area; and superimposing micromechanical canals on the macromechanical surface, the canals having a size smaller than the minimum size of the osteons in the bone into which the implant is to be inserted.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: July 7, 2009
    Assignee: Biomed Est.
    Inventor: Stefan Ihde
  • Patent number: 7530810
    Abstract: A dental implantation system is for securing a dental prosthesis in a patient's jawbone including an alveolar bone, a basal bone adjacent the alveolar bone, and a neurovascular bundle running through the jawbone. The dental implantation system may include a dental implant fixture having an elongate shape and including an upper portion to be positioned in the alveolar bone to receive the dental prosthesis and defining a first axis. The dental implant fixture may also include a lower portion to be positioned in the basal bone and defining a second axis. The dental implant fixture may further include an intermediate offset-defining portion between the upper portion and the lower portion to define an offset between the first axis and the second axis so that the lower portion avoids the neurovascular bundle.
    Type: Grant
    Filed: August 30, 2006
    Date of Patent: May 12, 2009
    Inventor: Milton A. Clement
  • Patent number: 7488175
    Abstract: A dental post comprising a rod fabricated of fiber-reinforced composite material. The rod comprises a plurality of frustoconical sections arranged coaxially along the longitudinal axis of the rod. Preferably the rod has consistent width along the longitudinal axis wherein the frustoconical sections each have the same tapered width and same length. The number of frustoconical units per rod can vary. The frustoconical sections may vary in shape. Moreover, the rod may include a channel therein extending along the longitudinal axis thereof. The rod may also include one or more grooves extending along the surface thereof.
    Type: Grant
    Filed: December 6, 2004
    Date of Patent: February 10, 2009
    Assignee: Pentron Clinical Technologies, LLC
    Inventors: Ajit Karmaker, Arun Prasad
  • Publication number: 20080171306
    Abstract: An endodontic device includes a thermoplastic polymer having a polymer backbone having arylene or heteroarylene moieties joined together by covalent bonds between ring carbon atoms.
    Type: Application
    Filed: January 17, 2008
    Publication date: July 17, 2008
    Inventors: Artie J. Goldberg, Charles J. Burstone
  • Publication number: 20080145820
    Abstract: Fiber-reinforced composite posts are produced having high strength and high radiopacity. In a method of manufacturing the fiber-reinforced composite posts, fibers are pulled through filled resin and heat is applied at various steps in the process to provide high strength and optimal radiopacity.
    Type: Application
    Filed: November 29, 2007
    Publication date: June 19, 2008
    Inventors: AJIT KARMAKER, Mike Karlak, Weitao Jia
  • Publication number: 20080131847
    Abstract: A dental post includes a composite material such as long fibers embedded in a resin matrix, and is able to transmit visible radiation when it is lit by a dental lamp to ensure polymerization of a product for setting in a tooth's root canal. The post, which has a specific color determined at ambient temperature before insertion into said canal, and which contains at least one thermochromic substance able to provide said specific color, loses its color when in place in the canal. A method for forming the dental post and a kit including a plurality of dental posts and drills are also disclosed.
    Type: Application
    Filed: October 18, 2006
    Publication date: June 5, 2008
    Inventors: Manh-Quynh CHU, Pierre-Luc REYNAUD
  • Publication number: 20080124682
    Abstract: The tooth root channel anchorage assembly comprises a core member to be fixed within the tooth root channel and a post to be inserted into the core member having a thoroughgoing bore. The core member comprises a crown part and an anchorage part to be fixed within the root canal, the surface of the anchorage part having a substantially hyperbolic form. Preferably the crown part of the core member as well as a part of the surface of the post have also a substantially hyperbolic form. The hyperbolic form allows a better anchoring and distributing of the load, thus reducing the danger of breaking of the post and root canal, still allowing the access to the root canal before the post is inserted.
    Type: Application
    Filed: November 20, 2007
    Publication date: May 29, 2008
    Inventors: Harald NORDIN, Peter NORDIN
  • Patent number: 7367804
    Abstract: An endodontic instrument extractor tool is configured for removing a fragment of a broken endodontic instrument that has become lodged within a root canal of a tooth. The extractor tool comprises an elongate shaft, including a hollow gripping body at a distal end, and a proximal handle portion. The hollow gripping body includes an inside diameter that is initially greater than a cross-sectional dimension of a fragment of a broken endodontic instrument to be removed from a root canal of a tooth. The inside diameter of the hollow gripping body defines a hollow interior cavity portion into which at least a portion of the fragment is receivable. At least the hollow gripping body of the body is formed of a shape memory alloy (e.g., nickel-titanium) or polymer in an expanded configuration so that upon heating, the shape memory alloy or polymer returns to its unexpanded configuration, tightly gripping around a proximal end of the fragment.
    Type: Grant
    Filed: August 25, 2006
    Date of Patent: May 6, 2008
    Assignee: Ultradent Products, Inc.
    Inventor: Paul Lewis
  • Patent number: 7331789
    Abstract: Dental posts and obturators are manufactured herein having a filling material applied to the apical end of the post and obturator such that the adherence strength between the filling material and the post or obturator is very high. The filling material is adhered to the post and obturator by applying one or more corona or plasma treatments to the surface of the post and obturator and thereafter applying the filling material to the surface-treated post and obturator. The surfaces of the post and obturator are modified by the corona or plasma treatments to create a highly adherent surface for the application of the filling material thereto. Dental restorations are manufactured herein wherein a veneer is applied to a dental substructure and the adherence strength of the veneer to the dental substructure is very high.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: February 19, 2008
    Assignee: Pentron Clinical Technologies, LLC
    Inventors: Ajit Karmaker, Arun Prasad
  • Patent number: 7303817
    Abstract: A dental filling material comprising an inner core and outer layer of material disposed and surrounding the inner core, both the inner core and outer layer of material each containing a thermoplastic polymer. The thermoplastic polymer may be biodegradable. A bioactive substance may also be included in the filling material. The thermoplastic polymer acts as a matrix for the bioactive substance. The composition may include other polymeric resins, fillers, plasticizers and other additives typically used in dental materials. The filling material is used for the filing of root canals.
    Type: Grant
    Filed: August 6, 2004
    Date of Patent: December 4, 2007
    Inventor: Weitao Jia
  • Publication number: 20070207444
    Abstract: Dental post made of a composite material contains a central core constituted of a resin matrix in which fibres are embedded. The core is surrounded by a sheath. The sheath is free of fibres and contains at least one substance which can make the post radiopaque.
    Type: Application
    Filed: March 1, 2007
    Publication date: September 6, 2007
    Applicant: Recherches Et Techniques Dentaires - R.T.D.
    Inventors: Pierre-Luc Reynaud, Manh-Quynh Chu, Frederic Sanchette, Laurent Bedel
  • Patent number: 7235290
    Abstract: A prepreg containing fibers and a curable matrix, the prepreg having a core and a surface part encasing the core, where the matrix of the core and of the surface part are made of the same material and where the proportion of the matrix to the fibers is higher in the core than in the surface part. A composite obtainable from the prepreg as well as the use of the composite or prepreg are also disclosed.
    Type: Grant
    Filed: June 12, 2002
    Date of Patent: June 26, 2007
    Assignee: Stick Tech Oy
    Inventors: Pekka Vallittu, Lippo Lassila, Antti Yli-Urpo
  • Patent number: 7125254
    Abstract: The present invention is directed to root canal obturation in a tooth. In one embodiment, a plug is positioned in a root canal and bonded to the root canal by applying a light-curing adhesive to the canal and exposing the plug to a light source to bond the plug to the root canal. In another embodiment, a carrier is disclosed having an optically transmissive plug portion for insertion into the canal. In still another embodiment, the plug portion of the carrier includes an optical fiber to transmit light from a light source into the plug portion. In still yet another embodiment, a filler material is heated and injected into the root canal in a semi-liquid state and exposed to light to cure the adhesive.
    Type: Grant
    Filed: December 28, 2001
    Date of Patent: October 24, 2006
    Inventor: Randall Rex Calvert
  • Patent number: 7001181
    Abstract: The invention relates to an applicator system (1) for application of a prefabricated reinforced composite post or anchor in its non-cured form into a dentinal canal (3). The invention is characterized in that the applicator system (1) comprises a prefabricated fiber-reinforced composite post or anchor in its non-cured form comprising a matrix and fibers, and an applicator tube (5) having a first end and a second end, wherein the inner diameter dT of said tube (5) is at most 5% larger than the outer diameter DP/A of said post or anchor in its non-cured form, and the outer diameter DT of the second end of said tube (5) through which the post or anchor is applied into the dentinal canal (3) is 0,5-2 mm. The invention further relates to the use of said applicator system.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: February 21, 2006
    Assignee: Stick Tech Oy
    Inventors: Ilkka Kangasniemi, Pekka Vallittu
  • Patent number: 6981875
    Abstract: Securing a dental post or a crown or bridge onto the dentin portion of a prepared tooth by utilizing a no-mix, two component, self-curing cement wherein the first component of the cement is applied to the interior dentin surfaces of a post hole, or onto the dentin surface of the tooth receiving the crown or bridge, and applying the second component of the cement onto the surface of a post, or crown or bridge so that when the post or crown or bridge is fitted onto the exposed dentin of a prepared tooth, the complementary components of the cement immediately chemically set to firmly secure the post, crown or bridge onto the prepared tooth. The respective components of the no-mix, two component, self-curing cement formulation for practicing the method require that each include a methacrylate resin. One of the components also includes an aromatic tertiary amine and the other component includes an organic peroxide.
    Type: Grant
    Filed: June 28, 2002
    Date of Patent: January 3, 2006
    Assignees: Centrix, Inc., Scientific Pharmaceuticals, Inc.
    Inventors: Jan A. Orlowski, John J. Discko, Jr.
  • Patent number: 6923650
    Abstract: A pilot bore is cut into bone tissue; a post is fixed in the bore, and an elongate enlarged region is formed at the top end of the bore using a tubular cutter which is guided on the post. The elongate enlarged region can be accurately cut even with a hand drill due to the guidance provided by the post. The cutter may have holes or channels for circulation of cooling/lubricating liquid, and a swarf-removing slot may be provided. When the technique is used in dentistry for replacement of a tooth crown, a tubular support element is fixed around the post in the bore enlargement.
    Type: Grant
    Filed: February 27, 2001
    Date of Patent: August 2, 2005
    Inventor: Hans Gustav Kurer
  • Publication number: 20040265783
    Abstract: An endodontic post comprises a combined endodontic post and tip of filling material such as thermoplastic material in a single unit. Obuturating systems are provided by an endodontic carrier and attached filling material. The post and obturator include a protrusion or depression on the tip section of the device for better attachment of the filling material to the device. Alternatively the post and obuturator are fabricated of a tube having a tunnel extending therethrough into which filling material is injected. The filling material extends out of the apical section of the post and obturator to form a filler cone.
    Type: Application
    Filed: August 1, 2003
    Publication date: December 30, 2004
    Inventors: Ajit Karmaker, Larry A. Lopez, Bruce Alpert, Bruce A. Finnigan
  • Publication number: 20040248067
    Abstract: An endodontic post comprising a combined endodontic post and filling material tip in a single unit. To use the post unit, the device is placed in an oven or heater to heat and soften the thermoplastic material. The device will then be placed in a root canal that has been opened to a predetermined dimension by use of endodontic files, to seal the apical end. If necessary, the gutta percha can be compacted toward the apex, while it is still in the softened state, to ensure the apex is adequately sealed. The post is then cemented into place by lining the canal walls with a bonding agent and filling the interface between the post and the walls of the canal with a dual cure resin cement. This will result in a coronal seal of the canal via resin restorative material and an apical seal of the canal by means of gutta percha and sealant. The remaining portion of the post, extending supra-gingivally, will be used to build a core around it. Any excess will be cut off.
    Type: Application
    Filed: June 6, 2002
    Publication date: December 9, 2004
    Inventors: Larry A. Lopez, Bruce A. Finnigan, Ajit Karmaker, Bruce Alpert, Weitao Jia