Dental Prosthodontic Type Patents (Class 249/54)
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Patent number: 11432914Abstract: Disclosed is a method for manufacture of a removable dental prosthesis by moulding, the method including: digital modelling of a prosthesis model; a step of producing a mould including a lower half-shell corresponding to a tooth part of the prosthesis and an upper half-shell corresponding to a gum part of the prosthesis, the two half-shells being able to be joined together by affixing one to the other, thereby forming an impression of the prosthesis, the step including digital modelling of a model of the mould, followed by additive manufacture of at least the lower half-shell, and a step of producing the prosthesis, the step including in succession at least one provision of at least one artificial tooth, positioning of the artificial tooth in a seat of the lower half-shell, assembling the mould and pouring a filler material into the mould. Also disclosed is a prosthesis obtained by this method.Type: GrantFiled: June 30, 2017Date of Patent: September 6, 2022Assignee: CIRCLE ANATOSCOPE INTUITIVE DESIGNInventor: Alexandre Forest
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Patent number: 10722331Abstract: A custom tool for forming a dental restoration in a mouth of a patient includes a mold body providing for a customized fit with at least one tooth of the patient. The mold body includes a facial portion forming a facial surface corresponding with a facial surface of the tooth, and a separate lingual portion forming a lingual surface corresponding with a lingual surface of the tooth. The mold body is configured to combine with the tooth of the patient to form a mold cavity encompassing missing tooth structure of the tooth.Type: GrantFiled: December 7, 2015Date of Patent: July 28, 2020Assignee: 3M INNOVATIVE PROPERTIES COMPANYInventors: James D. Hansen, Joseph C. Dingeldein, Shannon D. Scott, Joshua K. Schroeder, Bruce R. Broyles, Mary C. Doruff
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Patent number: 10507083Abstract: A medical method of affixing an element to a surface of dentine, tooth enamel, bone tissue, or corresponding substitute material. The method includes the steps of: providing an attachment composition, the attachment composition having a mixture of: a thermoplastic component; and a hardenable (for example curable) component. The hardenable component is different from the thermoplastic component. The method further includes the steps of: positioning the attachment composition relative to the surface of dentine, tooth enamel, bone tissue, or corresponding substitute material; and activating the attachment composition to attach to the surface or to attach to the element positioned relative to the surface. The step of activating the attachment composition includes activating the attachment composition by means of mechanical vibration.Type: GrantFiled: July 5, 2012Date of Patent: December 17, 2019Assignee: WOODWELDING AGInventors: Jörg Mayer, Andrea Mueller, Urs Weber
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Patent number: 10105200Abstract: The invention relates to a method for producing a dental model for removable insertion in a recess of a holder, which dental model has a referencing, comprising at least one tooth part having a base to be inserted into the recess, wherein the at least one tooth part is produced using digitized data of a jaw in that the digitized data are saved in a computer beforehand and supplied to a processing machine to produce the at least one tooth part. In order to ensure simple handling of the dental model and in particular to prevent faulty insertion of the dental model or segment, according to the invention the referencing is saved in the computer and, in consideration of the referencing, the at least one tooth part is produced as having the base as a unit.Type: GrantFiled: December 21, 2012Date of Patent: October 23, 2018Assignee: DEGUDENT GMBHInventors: Stefan Fecher, Andreas Gebhardt, Martin Haizmann, Heiner Horhold, Elmar Hock, Lothar Volkl
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Patent number: 9920994Abstract: The invention relates to a dental pressing furnace for producing a dental restoration element in a muffle (8) by heating and pressing a blank (14). The dental pressing furnace comprises a combustion chamber (6), comprising at least one guide opening (11) that is opened towards the outside and a pressing stamp (4) guided in the guiding opening (11) and protruding into the combustion chamber (6) for applying pressing force to the heated blank (14) in the muffle (8). A temperature transmitter (36) guided at least in part by the pressing stamp (4) is configured to guide a temperature (50) of the blank (14) in the combustion chamber (6) from said combustion chamber, and a temperature sensor (34) connected to the temperature transmitter (36) outside of the combustion chamber captures the temperature (50).Type: GrantFiled: February 6, 2014Date of Patent: March 20, 2018Assignee: Ivoclar Vivadent AGInventor: Rudolf Jussel
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Patent number: 9572640Abstract: Casting jigs, methods, and kits that may be used in manufacture of anatomical healing caps. A casting jig may include a body having one or more wells within the body, each well being open at a proximal end thereof and having a negative shape corresponding to an anatomical healing cuff body of a given tooth position. Each respective anatomical healing cuff body negative shape includes an asymmetrical cross-section and an irregular surface so that an anatomical healing cuff body having said shape is configured to provide substantially custom filling of at least an emergence portion of a void where a natural tooth once emerged or should have emerged from the void (e.g., in the case of a congenitally missing tooth). The casting jig may further include a socket at a distal end of each well that is configured to receive therein a dental implant or dental implant analog.Type: GrantFiled: January 10, 2014Date of Patent: February 21, 2017Inventors: Mark H. Blaisdell, Todd C. Liston
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Publication number: 20140231615Abstract: A separable ring apparatus for producing an investment mold is formed of a pair of semi-cylindrical half segments of flexible resilient high temperature resistant material; each having laterally opposed longitudinal sides, an interior with a longitudinal concave semicircular surface of a first smaller radius at opposed ends, and a longitudinal concave semicircular recess of a second larger radius intermediate the opposed ends. Each of the segments has a respective mating joint element extending longitudinally along the opposed longitudinal sides, respectively, for releasably joining the segments together in opposed facing relation to form an elongated generally cylindrical ring having opposed top and bottom ends defining a central circular bore of a smaller diameter at upper and lower ends, and a larger diameter recessed cavity intermediate the upper and lower ends.Type: ApplicationFiled: February 15, 2014Publication date: August 21, 2014Inventor: Jean J. Elnajjar
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Patent number: 8591228Abstract: An injection correction impression tray (18) serves for producing dental impressions for the subsequent manufacture of crowns, bridges and other dental prostheses. The tray (18) includes a base body (23) containing impression material and a profile bottom plate (27). The plate (27) includes a first channel (41) and a second channel (43) being arranged in the bottom side of the plate (27). The plate (27) is connected to the base body (23) in a way to close the bottom opening (6) of the tray (18) and such that the bottom side and the channels (41, 43) face the interior of the base body (23). The first channel (41) forms a rib of a first impression material being introduced into the interior of the base body (23) and flowing through the bottom opening (6) into the first channel (41).Type: GrantFiled: September 11, 2009Date of Patent: November 26, 2013Inventor: Gerd Neuschäfer
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Patent number: 8257622Abstract: The invention proposes a muffle with a pressing channel and at least one mold cavity that is coupled to the pressing channel via at least one connection channel. In this case, in order to increase the pressing pressure and to improve the intermixing of the blank material, it is proposed to arrange at least two blanks (18) side by side in the pressing channel (12).Type: GrantFiled: November 5, 2008Date of Patent: September 4, 2012Assignee: Ivoclar Vivadent AGInventors: Harald Gritsch, Max Wörishofer, Christoph Zobler, Thomas Stampfer, Hans-Peter Foser
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Patent number: 8252213Abstract: In preparing dentures, hardened mould material surrounds the denture. This mould material is adhered inside a denture flask with a housing having two separably matable portions. To remove the hardened mould material from the flask, the flask is mounted in a mould press having a shaft, with one of the portions is restrained against movement along an axis of travel of the shaft. A portion of the mould material at an end of the restrained flask portion is available for contact with the shaft along the axis of travel. A capped end of the shaft is forcefully advanced against the adhered mould material therein, thereby breaking the adhesion. After this is done, the denture flask is dismounted from the mould press and the hardened mould material is removed from the first flask portion. If necessary, the process is repeated with the other housing portion.Type: GrantFiled: February 20, 2008Date of Patent: August 28, 2012Inventor: Paul Kingsley Newton Conrad
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Patent number: 8116854Abstract: The attenuation and other optical properties of a medium are exploited to measure a thickness of the medium between a sensor and a target surface. Disclosed herein are various mediums, arrangements of hardware, and processing techniques that can be used to capture these thickness measurements and obtain three-dimensional images of the target surface in a variety of imaging contexts. This includes general techniques for imaging interior/concave surfaces as well as exterior/convex surfaces, as well as specific adaptations of these techniques to imaging ear canals, human dentition, and so forth.Type: GrantFiled: July 24, 2009Date of Patent: February 14, 2012Assignee: Massachusetts Institute of TechnologyInventors: Douglas P. Hart, Federico Frigerio, Davide M. Marini
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Patent number: 8067482Abstract: A process for the preparation of plastic molded articles which can be used in the dental field, the process including the steps of: mixing A) at least one polymerizable component and B) at least one initiator in desensitized form to form a paste having a consistency does not demix during injection; injecting the paste into a cuvette; and polymerizing the mixture by applying heat.Type: GrantFiled: March 2, 2007Date of Patent: November 29, 2011Assignee: Ivoclar Vivadent AGInventors: Volker Rheinberger, Wolfgang Wachter, Gottfried Rohner
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Publication number: 20110272554Abstract: The invention discloses a mould (10) of generally hollow frusto-conical shape with the mould wall (1) enclosing and defining a mould cavity (2) of frusto-conical shape and appropriately sized to enable the chairside casting of light cured composite (or other dental material) abutments onto mini dental implants such that direct impression taking when employing mini dental implants becomes simpler. The mould wall (1) may be made of light transmissible rigid to semi rigid material. If the mould wall (1) is of light transmissible material, light curable dental composite material may be used. An implant implement (30) comprising a mould (10) and an implant carrier (20) integrally formed is also disclosed.Type: ApplicationFiled: December 28, 2009Publication date: November 10, 2011Inventor: Kai Foo Chow
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Publication number: 20110127686Abstract: There is provided an automatic thermoformer for dental and other prosthetic devices, that operates vertically on a blank, without operator manipulation thereof.Type: ApplicationFiled: November 26, 2010Publication date: June 2, 2011Inventor: Mohssen BEHRAD
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Publication number: 20100244294Abstract: A dental article such as a crown is fabricating by layering one or more preformed shells of SMC material onto an understructure. The understructure may be fabricated from any suitably strong material for use in replacing dentition. At the same time, a number of SMC shells may be used to provide a finished dental article having a natural-looking, multi-chromatic appearance. The SMC material(s) may be cured to provide an exterior hardness suitable for use in dental applications.Type: ApplicationFiled: November 24, 2008Publication date: September 30, 2010Inventors: Naimul Karim, Sumita B. Mitra, Marcelino Salviejo-Rivas
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Publication number: 20100129762Abstract: The present invention relates to orthodontic positioning appliances that represent teeth in desired positions and related systems and methods. An appliance can include teeth receiving cavities shaped to receive and apply a resilient positioning force to a patient's teeth. An appliance can include an outer component having a surface representing teeth in desired positions. An outer component can be integral with an appliance. An outer component can be separate and configured to couple with an appliance main body.Type: ApplicationFiled: November 24, 2008Publication date: May 27, 2010Applicant: Align Technology, Inc.Inventors: David Mason, Eric Kuo
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Patent number: 7686278Abstract: A tooth mold retaining frame comprises an L shape seat; a pivotal block; a universal connector; a first positioning block; a second positioning block; and a first fine adjust unit. By using the first fine adjust unit, second fine adjust unit and the fine-adjust device, an upper teeth mold, and a lower teeth mold can move with respect to one another precisely. By a universal connector, the upper teeth mold can move three directionally and can lift or descend proportionally so as to avoid the error in manufacturing of the teeth mold. Thus the teeth mold can be made precisely and the condition of the teeth mold can be viewed conveniently. Furthermore, the teeth mold can be sent directly without needing to send the teeth frame. Thus, the manufacturer can make the teeth mold continuously without affecting the working time.Type: GrantFiled: May 2, 2007Date of Patent: March 30, 2010Inventor: Chao-Hung Lin
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Publication number: 20100035211Abstract: A kit (1) to make an individual impression tray for dental use comprising essentially a standard model (20) reproducing a dental arch (24), a semifinished product of thermoformable material, for example a plate member (30), and a container (10) for a heat exchange liquid. The first step that is carried out by the dentist (60) to obtain the individual impression tray (100) provides the insertion of the model (20) in the container (10). Then, next to dental arch of the model (20) a plate member (30) is arranged and hereafter a certain amount of a liquid is put (15), for example water, in the container (10) up to covering plate member (30). The liquid (15) is then heated by a source of thermal power, for example a microwave oven (40) stopping heating when the temperature of the liquid (15) achieves a value T* higher than the temperature for softening the thermoformable material of the plate member (30).Type: ApplicationFiled: February 22, 2008Publication date: February 11, 2010Inventor: Antonio Monicelli
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Publication number: 20090267251Abstract: An arrangement and method are provided for supplying material to production equipment for ceramic products. The arrangement comprises a first unit that can be at least partially surrounded by a second unit to which it is secured via its outer surface. The second unit can be designed so that it can be fed forward and divided by the production equipment. The first and second units can be arranged to facilitate silhouetting in at least the first unit and to facilitate the creation of at least one securing part between the first and second units. The securing part can comprise one of a combination of the material of the second unit with a joining material and a combination of the material of the first unit with the joining material.Type: ApplicationFiled: August 11, 2005Publication date: October 29, 2009Applicant: NOBEL BIOCARE SERVICES AGInventor: Ulf Johansson
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Patent number: 7507080Abstract: An apparatus for manufacturing muffles for producing dental prosthetic parts comprises a collar divided at least once in the peripheral direction to form a receiving space for an investment material in which at least one pattern for a dental prosthetic part is arranged before the filling with the investment material. At least one pattern holder simultaneously serves as a spacer for an injection plunger passage and a base part closes an open side of the collar. Holding means encompasses the collar to hold the collar together, with the collar being conical with respect to the longitudinal axis thereof at least in one section for simpler manufacture and better handling. The holding means includes at least one ring, in particular a rigid ring, which has a conical inner surface with which it is pushed onto the conical section in the collar.Type: GrantFiled: February 17, 2006Date of Patent: March 24, 2009Assignee: DEKEMA Dental-Keramikoefen GmbHInventors: Martin Helmberger, Stephan Miller
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Publication number: 20080272271Abstract: A tooth mold retaining frame comprises an L shape seat; a pivotal block; a universal connector; a first positioning block; a second positioning block; and a first fine adjust unit. By using the first fine adjust unit, second fine adjust unit and the fine-adjust device, an upper teeth mold, and a lower teeth mold can move with respect to one another precisely. By a universal connector, the upper teeth mold can move three directionally and can lift or descend proportionally so as to avoid the error in manufacturing of the teeth mold. Thus the teeth mold can be made precisely and the condition of the teeth mold can be viewed conveniently. Furthermore, the teeth mold can be sent directly without needing to send the teeth frame. Thus, the manufacturer can make the teeth mold continuously without affecting the working time.Type: ApplicationFiled: May 2, 2007Publication date: November 6, 2008Inventor: Chao-Hung Lin
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Patent number: 7445440Abstract: A polymerization temperature test element is provided for a polymerization device of the type, in particular, for polymerizing dental products. The polymerization temperature test element includes a base element and a receipt region centrally disposed on the base element and operable to receive the mass to be polymerized. The energy source of the polymerization device irradiates the mass to be polymerized with one or both of light radiation and thermal radiation to effect polymerization of the mass and the base element and the receipt region are configured so as to be subjected to the respective light and thermal radiation emitted by the energy source. Accordingly, the polymerization temperature test element provides an indication, via color-temperature indicators which change color or brightness at discrete temperatures, that a target polymerization temperature has been reached during irradiation of the mass.Type: GrantFiled: July 18, 2003Date of Patent: November 4, 2008Assignee: Ivoclar Vivadent A.G.Inventors: Walter Pokorny, Michael Brotzge, Werner Langle, Werner Kindle
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Patent number: 7118085Abstract: A method for producing dental restoration components includes filling a retort cylinder of a retort system with a forming mass, the retort cylinder being at least partially encircled by a charging body, and hardening the forming mass. After the hardening of the forming mass, the retort cylinder and the charging body are removed from the forming mass, thereby leaving behind a retort. Thereafter, with the assistance of a press blank apparatus, a press blank having an outer contour substantially corresponding to the outer contour of the charging body is pressed into the retort.Type: GrantFiled: January 29, 2003Date of Patent: October 10, 2006Assignee: Ivoclar Vivadent AGInventors: Hanspeter Foser, Thomas Stampfer
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Patent number: 6923420Abstract: A method of preparing a ceramic artificial crown by applying at least one kind of dental porcelain onto the surface of a ceramic core molded by heating and softening a ceramic material and putting it into a mold with the application of pressure followed by firing wherein said mold is the one formed by burning a wax pattern after having removed a crucible former from an assembly which makes it possible to efficiently prepare a fully ceramic artificial crown of a high quality in a short period of time.Type: GrantFiled: May 12, 2003Date of Patent: August 2, 2005Assignee: Tokuyama CorporationInventors: Masato Sekino, Masaaki Ushioda, Kyoichi Fujinami, Osamu Iwamoto
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Patent number: 6848898Abstract: An adaptation device and method for molding a dental material to a die in the preparation of a dental coping with the die having the shape of a tooth to be restored and with said dental material placed over said die. The adaptation device includes a base for placement of the die, a cover mounted on the base over the die to form an enclosed chamber, an inlet opening extending through the cover into communication with the chamber, a source of a gaseous fluid connected to the inlet opening for pressurizing the chamber, an outlet opening extending through the base in proximity to said die and diaphragm means removably positioned in the chamber to surround the die and to isolate the outlet opening from the chamber such that upon pressurizing the chamber the diaphragm is caused to collapse about the die and to apply a uniform pressure over the dental material for adapting the dental material to the die.Type: GrantFiled: August 29, 2001Date of Patent: February 1, 2005Inventors: Itzhak Shoher, Ahqron Whiteman
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Patent number: 6843951Abstract: The method of making a dental device or the like which involves starting with a pattern of the device to be made, closely surrounding that pattern with a settable material to form a unit with the pattern, separating the unit and removing the pattern therefrom, filling the thus produced space with settable material of the type desired for the ultimate device, setting that material and removing the set material constituting the device to be made, and in particular utilizing a retention device to enclose the settable materials and other contents. The process is particularly useful when the device is to be made of a light-sensitive material, in which case the retention device and the first-used settable material are light-transmissive and the retention device preferably focuses light on the material to be set.Type: GrantFiled: June 1, 2002Date of Patent: January 18, 2005Inventors: Dan Vogel, Richard J. Pitz
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Publication number: 20040213869Abstract: There are currently milling machines in dental laboratories that take blank blocks of ceramic and mill them into replacement teeth based upon CAD specifications. However, no option currently exists to make the replacement teeth out of anything but ceramic. Thus, I have invented a molded form to make composite blank blocks which are less expensive than ceramic blocks and thus offer an option for the patient.Type: ApplicationFiled: October 21, 2002Publication date: October 28, 2004Inventor: Ward Crisp Whitaker
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Publication number: 20040108610Abstract: A method for producing dental restoration components includes filling a retort cylinder of a retort system with a forming mass, the retort cylinder being at least partially encircled by a charging body, and hardening the forming mass. After the hardening of the forming mass, the retort cylinder and the charging body are removed from the forming mass, thereby leaving behind a retort. Thereafter, with the assistance of a press blank apparatus, a press blank having an outer contour substantially corresponding to the outer contour of the charging body is pressed into the retort.Type: ApplicationFiled: January 29, 2003Publication date: June 10, 2004Applicant: Ivoclar Vivadent AGInventors: Hanspeter Foser, Thomas Stampfer
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Publication number: 20020064745Abstract: Solid free form fabrication techniques such as fused deposition modeling and three-dimensional printing are used to create a shell used in the manufacture of a dental restoration. Three-dimensional printing comprises ink-jet printing a binder into selected areas of sequentially deposited layers of powder. Each layer is created by spreading a thin layer of powder over the surface of a powder bed. Instructions for each layer may be derived directly from a CAD representation of the restoration. The area to be printed is obtained by computing the area of intersection between the desired plane and the CAD representation of the object. All the layers required for an aesthetically sound shell can be deposited concurrently slice after slice and sintered/cured simultaneously.Type: ApplicationFiled: September 5, 2001Publication date: May 30, 2002Inventors: Martin L. Schulman, Carlino Panzera
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Patent number: 6386503Abstract: A mold for embedding casts in an embedding compound for producing molds for dental workpieces, such as crowns and bridges, which has a mold cavity which can be filled with the embedding compound, which holds at least one cast and which is closed by a cylindrical peripheral wall and by a bottom part. The peripheral wall is formed by a blank of a transparent or translucent flat elastic material.Type: GrantFiled: January 4, 2000Date of Patent: May 14, 2002Assignee: Dental Forschung Schleicher GmbHInventor: Wolfgang Schleicher
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Patent number: 6332991Abstract: A container for cross-linking composite materials on dental bridges and arches and on individual teeth, comprising: a plurality of plate-like elements which can be stacked and clamped together, at least one of the plate-like elements, which is internal to the plurality of plate-like elements, being constituted by a plurality of blocks which can be removed independently of each other to form an area which is suitable to constitute a mold into which it is possible to place a metallic structure on which the elements of a dental prosthesis are to be formed, the at least one of the plate-like elements and a plate-like element that is adjacent thereto in an upward region and constitutes the top plate-like element of the container being both made of a material which is transparent to light.Type: GrantFiled: November 29, 1999Date of Patent: December 25, 2001Inventors: Silvia Assi, Antonio Tissi
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Patent number: 6287490Abstract: A method for manufacturing a fiber rein-forced composite dental restoration comprising the steps of (i) preparing a mould; (ii) filling the cavity of the mould with a fiber-reinforced polymerizable material comprising an organic matrix and a fiber component embedded within the matrix; (iii) applying pressure to the fiber-reinforced polymerizable material; and (iv) curing the fiber-reinforced polymerizable material. The method is characterized in that the mould is designed in a way which allows excess organic matrix material to escape form the cavity during pressing.Type: GrantFiled: April 17, 1998Date of Patent: September 11, 2001Assignee: Ivoclar AGInventors: Volker Rheinberger, Gerhard Zanghellini
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Publication number: 20010001510Abstract: The invention relates to a method for manufacturing a fiber reinforced composite comprising the steps of (i) preparing a mould; (ii) filling the cavity of the mould with a fiber-reinforced polymerizable material comprising an organic matrix and a fiber component embedded within the matrix; (iii) applying pressure to the fiber-reinforced polymerizable material; and (iv) curing the fiber-reinforced polymerizable material. The method is characterized in that the mould is designed in a way which allows excess organic matrix material to escape form the cavity during pressing.Type: ApplicationFiled: April 17, 1998Publication date: May 24, 2001Inventors: VOLKER RHEINBERGER, GERHARD ZANGHELLINI
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Patent number: 6203319Abstract: A mold used to form small pellets of dental filling material. The mold has several flat surfaces, on which several individual pellet-forming grooves (12a-d) are located. A handle is attached to one end (10).Type: GrantFiled: December 1, 1999Date of Patent: March 20, 2001Inventor: Edward Stanley Lee
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Patent number: 6186761Abstract: The invention includes a system and method for making injection molded dental appliance apparatuses having an injector module removably attached to a dental flask, a press and a controlled compression apparatus, wherein the press and compression apparatus introduce pressure into the dental flask and the injector module, which pressure may or may not be maintained during curing of the appliance. The invention also includes a system for dispensing dental appliance chemicals having at least one chemical dispensing apparatus and a mixing container; whereby a separate dispensing apparatus is used for each chemical and the chemicals are dispensed and mixed in the same container.Type: GrantFiled: February 19, 1998Date of Patent: February 13, 2001Assignee: GC America, Inc.Inventors: Lothar Petkow, Wolf Parisius, A. A. Robertson
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Patent number: 6089307Abstract: The casting assembly includes a horseshoe shaped casting ring having a plurality of handling posts; a horseshoe shaped crucible former having a flange for retaining the casting ring and a top surface for supporting the casting ring; and a pair of tongs having a plurality of openings, each of the openings adapted to receive one of the handling posts.Type: GrantFiled: May 14, 1998Date of Patent: July 18, 2000Inventors: Joe C. Waters, Sr., Michael C Abernathy
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Patent number: 5996963Abstract: A dental stone casting mold device (10) for use with a hardenable stone material (21) includes associated first and second side walls (11, 12) first and second end walls (13, 14) and a floor (15), forming an open top cavity (16). Each first and second side walls (11, 12) and first and second end walls (13, 14) extend from the floor (15) in a lateral direction, such that each has a portion (17) proximate to the floor (15) and a portion (18) distal thereto. There is also at least one slot (22) in the floor (15) removably receiving a stone retaining spine (20). In a preferred embodiment, each of first and second side wall (11, 12) carries a plurality of spaced indexing ribs (60). In another embodiment, each distal end 18 of the first and second side walls (11, 12) have integrally associated lateral extensions or webs (80) therefrom. Device (10) may also be provided with indexing bar or articulator attachment structures (101, 110).Type: GrantFiled: January 22, 1998Date of Patent: December 7, 1999Assignee: Ceramco Inc.Inventor: Robert M. Michael
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Patent number: 5965171Abstract: An apparatus for producing dentures having a synthetic resin base comprises a flask tank provided with a tank closure which is opened when a flask is brought into and out of the tank and when resin is to be injected into the flask and which is closed when wax is to be removed. The flask tank has a wax pattern heater and is formed with fluid channels adapted to communicate with a resin injecting gate of the flask for successively supplying cleaning hot water, drying air and separating agent to the interior of the flask therethrough.Type: GrantFiled: August 4, 1997Date of Patent: October 12, 1999Assignee: Satoyuki MatsushitaInventors: Hiroyuki Katto, Mitsuji Matsuyama
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Patent number: 5962038Abstract: A frame is provided for firmly securing a dental press holding one or more flasks during preparation of dental prostheses. The frame securely locks the press in position and facilitates tightening of the press to exert pressure on the dental flasks as well as release of the pressure once the procedure is completed. Use of the frame permits a single technician to tighten and loosen the press with a single hand and allows greater tightening of the press to exclude voids and pockets in the finished prosthesis.Type: GrantFiled: July 31, 1997Date of Patent: October 5, 1999Assignee: Eastflex Corp.Inventors: Daniel E. Purvis, Maris J. Lans
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Method for preparing a molded glass material for use in the manufacture of living tissue replacement
Patent number: 5948129Abstract: A living tissue replacement of crystallized glass having bioaffinity and mechanical strength is briefly obtained simply by pressure molding or machining without using a special equipment. A glass material having a softening point below its crystallization temperature and exhibiting viscous flow at temperatures below its melting point is heated at a temperature above its Tg and pressed at the temperature to mold to a desired shape, thereby manufacturing a living tissue replacement such as a dental crown. Molding can be done under a pressure of up to 20 MPa.Type: GrantFiled: October 24, 1996Date of Patent: September 7, 1999Assignee: TDK CorporationInventors: Toru Nonami, Tatsuji Sano, Sadami Tsutsumi, Tetsuo Urabe, Masahiro Fukuma -
Patent number: 5893405Abstract: A mold assembly and sprue configuration for dental investment casting includes a ring shaped casing, a base and a cover all made of resilient plastic material and fictionally engaged with each other. The base includes a raised neck having a top surface with a sighting bead for use in mounting wax forms on the sprue, positioned within the casing. The sprue includes a post for engaging a blind bore in a hub of the base. The cover includes a downwardly extending plug which extends into the body of the casing, and a curved lip with recess for facilitating the pouring of investment solution into the mold. The sprue has three spokes and a ring which are all triangular in cross-section to reduce the amount of metal needed in the precision casting to be made with the invention and also to provide a convenient flat upper surface for mounting wax forms to the sprue.Type: GrantFiled: October 24, 1997Date of Patent: April 13, 1999Assignee: Belle de St. ClaireInventor: Robert P Berger
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Patent number: 5858417Abstract: A resin injector is used to fill recesses created in plaster moulds containing teeth in the interior of muffles with resin, with a simple economic mechanical device which is attached to the muffle and is operated by a conventional press. An assembly of two cylindrical part (4,8) is adjusted to a wide inlet mouth cut in the muffle. The resin which is received in this assembly is projected towards the muffle through at least one hole, which can be opened or closed at will by means of a manually operated part.Type: GrantFiled: May 12, 1997Date of Patent: January 12, 1999Inventor: Max Bosshart
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Patent number: 5688533Abstract: A mold assembly and sprue configuration for dental investment casting includes a ring shaped casing, a base and a cover all made of resilient plastic material and fictionally engaged with each other. The base includes a raised neck having a top surface with a sighting bead for use in mounting wax forms on the sprue, positioned within the casing. The sprue includes a post for engaging a blind bore in a hub of the base. The cover includes a downwardly extending plug which extends into the body of the casing, and a curved lip with recess for facilitating the pouring of investment solution into the mold. The sprue has three spokes and a ring which are all triangular in cross-section to reduce the amount of metal needed in the precision casting to be made with the invention and also to provide a convenient flat upper surface for mounting wax forms to the sprue.Type: GrantFiled: February 12, 1996Date of Patent: November 18, 1997Assignee: Belle de St. Claire, Inc.Inventor: Robert P. Berger
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Patent number: 5672305Abstract: A method of manufacturing a medical prosthetic article by injecting a thermoplastic resin into the cavity of a plaster mold, comprising the steps of: confining first and second plaster molds having porous structures respectively in first and second mold bodies made dividable from each other, the first and second plaster molds defining therein a cavity having first and second inner faces, a contour of a medical prosthetic article to be molded, a sprue runner communicating with the cavity, and an air vent communicating with the cavity; sealing up the cavity not only from the ambient air but also from the porous structures of the first and second plaster molds, when the first and second mold bodies are closed; evacuating the cavity through the air vent; and injecting a thermoplastic resin through the sprue runner into the cavity under a predetermined degree of vacuum.Type: GrantFiled: April 19, 1996Date of Patent: September 30, 1997Inventor: Yamato Kogure
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Patent number: 5655592Abstract: Compression and distortion on a wax pattern during curing are eliminated by employing a thermochromatic dye which changes color when investment material sets. By monitoring the dye, the set investment material can be removed from the assembly before curing, eliminating compression forces on the wax pattern from the exothermic curing process expanding the investment material against the constraints of the assembly.Type: GrantFiled: September 29, 1994Date of Patent: August 12, 1997Assignee: Leach & Dillon, Inc.Inventor: Michael R. Sullivan
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Patent number: 5599491Abstract: An apparatus for making a mold for forming positive models identical to a positive master has upper and lower mold shells having confronting and contiguous rims lying in respective planes. The shells are dimensioned when juxtaposed to spacedly contain the master. A clamp is engageable with the shells generally at the rims to hold the shells together with the plane of their rims spaced apart.Type: GrantFiled: September 8, 1994Date of Patent: February 4, 1997Assignee: Krupp Medizintechnik GmbHInventors: Benedikt Pollock, Albert Schr oder
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Patent number: 5469908Abstract: A cap for an investment vessel for receiving investment material comprises a platform having a contoured edge and an underside. A wedge is located on the underside of the platform and is frictionally engageable with at least a portion of an inner edge of the top of the vessel. When the cap is placed in frictional engagement with the vessel, the contoured edge provides a restricted opening to the vessel for controlling the flow of the investment material. A lip is provided on the platform at the contoured edge for channeling investment material to the opening.Type: GrantFiled: March 15, 1994Date of Patent: November 28, 1995Assignee: Belle de St. ClaireInventors: James Chmel, Robert P. Berger
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Patent number: 5406999Abstract: A device for receiving dental investment solution to create an investment mold, has an oval casing which fictionally engages an oval base. Anti-rotation tabs of the base extend into anti-rotation slots in the casing, with both casing and base made of flexible plastic material.Type: GrantFiled: February 3, 1994Date of Patent: April 18, 1995Assignee: Belle de St. ClaireInventors: Robert P. Berger, Steven Benson
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Patent number: 5338192Abstract: An expander for a three-part, Hanau dental flask to add vertical height to the flask when the total height of the wax model of a prosthesis and mold material exceeds the normal height of the flask. The flask expander requires no alteration or modification of the standard dental flask, and sandwiches in between the existing flask base and body or between the flask body and lid.Type: GrantFiled: April 14, 1993Date of Patent: August 16, 1994Inventor: Joseph C. Weber
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Patent number: 5324186Abstract: A molding flask structure for molding close tolerance articles, such as prosthetic dental devices. The flask structure includes upper and lower flask members that each include cup-recesses adapted to face each other to define therebetween a mold cavity when the flask members are connected together. Assembly of the flask members is effected by a plurality of connecting bolts to securely hold the flask members together. Vent passageways are provided in the flask members to extend from the mold cavity to permit excessive internal pressures to be relieved to the exterior of the flask member. A sprue opening defined by semi-cylindrical recesses in contacting faces of each of the flask members extends from the mold cavity to the exterior to permit the introduction of molding material into the mold cavity. The sprue opening is partially threaded and partially unthreaded.Type: GrantFiled: February 18, 1993Date of Patent: June 28, 1994Assignee: Douglas R. HeldInventor: Joseph T. Bakanowski