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Publication numberUS20050056350 A1
Publication typeApplication
Application numberUS 10/976,734
Publication dateMar 17, 2005
Filing dateOct 29, 2004
Priority dateJan 19, 1999
Also published asUS20020187458, US20100028191, US20120148987
Publication number10976734, 976734, US 2005/0056350 A1, US 2005/056350 A1, US 20050056350 A1, US 20050056350A1, US 2005056350 A1, US 2005056350A1, US-A1-20050056350, US-A1-2005056350, US2005/0056350A1, US2005/056350A1, US20050056350 A1, US20050056350A1, US2005056350 A1, US2005056350A1
InventorsHaig Dolabdjian, Roland Strietzel
Original AssigneeHaig Dolabdjian, Roland Strietzel
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method for producing tooth replacements and auxiliary dental parts
US 20050056350 A1
Abstract
In a method for forming a dental part, a laser beam is guided over a powder layer of biocompatible material. The laser is guided by a computer controlled laser scanning system based on data representing the shape of the cross-section through the shaped body. The powder is substantially melted by the laser beam to form a layer in the shaped body, to build the shaped body entirely from layers of laser-melted material.
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Claims(15)
1. A method of making a shaped body for use as a dental part, comprising:
guiding a laser beam over a powder layer using a computer-controlled laser scanning system based on data representing the shape of a cross-section through the shaped body, the powder comprising a biocompatible material of grain size in the range from 0 μm to 50 μm, to create a layer in the shaped body;
substantially melting the powder with the laser beam; and
repeating the guiding and melting over successive powder layers using successive cross-sectional representative data so as to build the shaped body entirely from layers of laser-melted material.
2. The method as recited in claim 1, wherein the molten powder substantially maintains the shape of each cross-section through the shaped body.
3 The method as recited in claim 1, wherein the shaped body has an average density of up to 98% of the density of the biocompatible material.
4. The method as recited in claim 1, wherein the shaped body has an average density of up to 99.9% of the density of the biocompatible material.
5. The method as recited in claim 1, wherein the powder comprises an alloy with essentially equal proportions of alloy components in each grain of the powder.
6. The method as recited in claim 1, wherein the biocompatible material is a metal alloy.
7. The method as recited in claim 1, wherein the biocompatible material is Ni61.4, Cr22.9, Mo8.8, Nb3.9, Fe2.5, Mn0.4, and Ti0.1.
8. An intermediate for being made into a shaped dental part for use in a patient's mouth, comprising:
a partial body comprising biocompatible material and having a surface shaped to fit in the patient's mouth; and
a layer of powder alloy disposed upon a surface of the partial body and comprising particles of the biocompatible material, the particles generally being of a predetermined density, having varying grain sizes in a range of about 0 μm to about 50 μm, and having essentially equal proportions of alloy components in each particle;
wherein the biocompatible material of the partial body has a density of not less than about 98% of the predetermined density of the particles.
9 The intermediate as recited in claim 8, wherein the biocompatible material of the partial body has a density between 98% and 99.9% of the predetermined density.
10 The intermediate as recited in claim 8, wherein the biocompatible material is a metal alloy.
11. The intermediate as recited in claim 8, wherein the biocompatible material is 61.4% Ni, 22.9% Cr, 8.8% Mo, 3.9% Nb, 2.5% Fe, 0.4% Mn, and 0.1% Ti.
12. The intermediate as recited in claim 8 wherein the particle layer is of a thickness for forming a layer of cohesively maintained biocompatible material, when melted by a guided laser beam, to enlarge the partial body.
13. An intermediate for being made into a shaped dental part for use in a patient's mouth, comprising:
a partial body comprising biocompatible material and having a surface shaped to fit in the patient's mouth; and
a layer of powder alloy disposed upon a surface of the partial body and consisting of particles of biocompatible material generally having a predetermined density and essentially equal proportions of alloy components, the particles further having varying grain sizes in a range of from about 0 μm to about 50 μm;
wherein the biocompatible material of the partial body has a density of not less than about 98% of the predetermined density of the particles; and
wherein the particle layer is of a thickness for forming a layer of cohesively maintained biocompatible material, when melted by a guided laser beam, to enlarge the partial body.
14. The intermediate as recited in claim 14, wherein the biocompatible material is a metal alloy.
15. The intermediate as recited in claim 14, wherein the biocompatible material is 61.4% Ni, 22.9% Cr, 8.8% Mo, 3.9% Nb, 2.5% Fe, 0.4% Mn, and 0.1% Ti.
Description
  • [0001]
    The present application is a divisional of prior application Ser. No. 10/146,610 filed 14 May 2002, which is a continuation-in-part of application Ser. No. 10/081,039 filed 19 Feb. 2002.
  • FIELD OF THE INVENTION
  • [0002]
    This invention relates to a method of forming a dental part and/or a tooth replacement part.
  • BACKGROUND OF THE INVENTION
  • [0003]
    Tooth replacements in the form of crowns, bridges, inlays and the like frequently comprise complex molded bodies which must usually take account in each specific case of the spatial configuration of intact tooth parts (tooth stumps), entire teeth or parts of the jaw that have been lost, on the one hand, and the spatial situation in relation to adjacent and/or antagonistic teeth, on the other hand. In the prior art, such tooth replacement elements are produced in complex processes. The most widespread method is to produce the shaped bodies required—usually made of precious-metal or base-metal alloys, as well as pure metals—in a multi-step impression and casting process.
  • [0004]
    Computer-controlled milling of such shaped bodies out of the solid material has become known. This method inevitably leads to considerable waste that has to be reprocessed at great effort and expense.
  • SUMMARY OF THE INVENTION
  • [0005]
    The objective of the invention is to provide another, more advantageous way of producing such shaped bodies (and auxiliary dental parts required in implantology) that provides flexibility in manufacturing dental parts of different shapes, but which reduces the amount of waste and results in a strong dental part.
  • [0006]
    A method in accordance with the principles of the invention includes a method of making a shaped body for use as a dental part. The method comprises guiding a laser beam over a powder layer using a computer-controlled laser scanning system based on data representing the shape of a cross-section through the shaped body. The powder comprises a biocompatible material of grain size in the range from 0 μm to 50 μm, to create a layer in the shaped body. The method further comprises substantially melting the powder with the laser beam, and repeating the guiding and melting over successive powder layers using successive cross-sectional representative data so as to build the shaped body entirely from layers of laser-melted material.
  • [0007]
    In another embodiment of the present invention, a shaped dental part for use in a patient's mouth. The shaped dental part comprises a body formed from melted particles of biocompatible material, the body having a surface shaped to fit in the patient's mouth and having a density of up to 98% of the density of the biocompatible material. The particles having pre-melting sizes in the range 0 μm-50 μm, and having essentially equal proportions of alloy components in each particle.
  • DETAILED DESCRIPTION OF THE INVENTION
  • [0008]
    The invention relates to a method that has become known in another field as “rapid prototyping” for producing complex tools or components as disclosed in U.S. Pat. No. 4,863,538 included herein by reference. According to said method, shaped bodies made of a sintering powder are built up in layers by exposing each layer successively to the energy of a laser beam that leads to local sintering, whereby the laser beam is guided over the respective powder layer by means of a computer-controlled system using data that represent the configuration of the shaped piece in this layer. As a result of supplying such energy, the powder elements affected in each case are superficially melted and form a fixed bond with each other and the underneath layer. Due to the precise focusing of the laser beam, the energy supply can be configured exactly—at relatively high density—and controlled in accordance with the stored spatial data of the shaped body required.
  • [0009]
    Conventionally, in a sintering process, compressed powdered material is heated to a temperature close to but not at melting, usually in a controlled-atmosphere furnace. This is done so that particles may bond by solid state bonding, but not melt. Such sintering increases both density and strength of the material, because compaction alone leads to both properties being low. The latter is also true with sintering without compaction (compressing) the powdered material, as is the case with the selective sintering process addressed before.
  • [0010]
    It has been found that, rather than selectively sintering metal powder by superficially melting the uncompressed material, a still considerably higher density of the finished product can be achieved by substantially entirely melting the powdered material, primarily metal. Quite surprisingly, such “selective melting” of the powder does not lead to uncontrolled flowing away of the material, probably because the cohesion forces suffice to keep the thin layer of material in place, even in its molten state.
  • [0011]
    Using this method of “selective melting”, the porosity of the resultant part is significantly less than what is achieved under conventional laser sintering. For example, densities achieved with the conventional selective laser sintering technique ranges from 70-80%, while the densities achieved through ceramic sintering techniques range from 60-70%. In contrast, the density of the resultant part using a method according to the invention may be greater than 98% of the density of the biocompatible material, and may be as high as 99.9% of the density of the biocompatible material. Thus, a dense, and therefore strong, part may be formed using the laser selective melting technique. This permits the resultant part to be made with the desired shape without using a mold, but the part is also more able to withstand the high stresses that result from biting and chewing.
  • [0012]
    Furthermore, the invention provides for a powder consisting of a biocompatible material of varying grain size between 0 and 50 μm. In contrast to current application of the selective laser sintering method for technical purposes, the invention thus ensures that the shaped body designed for dental purposes is compatible with human tissue (see Hoffmann-Axthelm, Lexikon der Zahnmedizin [Encyclopedia of Dental Medicine], 6th/11th edition, p. 97, and Reuling, Biokompatibilitšt dentaler Legierungen [Biocompatibility of Dental Alloys]). The grain size distribution ensures the forming of dense layers with the advantage of minimal creation of cavities between the layer after melting, which would be susceptible to bacteria cultures forming; in addition, it defines the size and fitting accuracy of the restoration.
  • [0013]
    While larger cross-sectional areas of the dental part to be produced, are impacted by the laser beam by oscillating it in one direction, and shifting the oscillating beam in a direction perpendicular thereto, as explained in U.S. Pat. No. 4,863,538 mentioned above, according to the invention the laser beam follows the contour of the wall to be produced within the cross-section of thin-walled areas.
  • [0014]
    Due to its certain degree of roughness, the surface of the shaped body produced in accordance with the invention is particularly well-suited for the frequently desired veneering process using ceramic or other materials, as is the case with crowns or bridges. Furthermore, because it is easy to influence the file on which the control process is based, it is possible to make corrections to the configuration of the shaped body that may appear desirable (with respect to the traced result) for a wide variety of reasons.
  • [0015]
    The powder preferably comprises an alloy with essentially equal proportions of the alloy components in each grain of powder. This provides a major advantage compared to the conventional production of shaped dental bodies from melted alloys, because there is no risk of segregation of the alloy components in the melt and/or in the shaped body after casting. In addition, the production of semi-finished products that are made of certain alloys and are particularly advantageous for dental purposes necessitates complicated and costly processes, such as suction casting and the like, whereas pulverization of such alloys is significantly less complex. However, whereas a melt produced from such a powder (for subsequent production of shaped cast bodies) is exposed for its part to the risk of segregation and thus non-homogeneity, a shaped body that is selectively melted according to the invention maintains its uniform distribution of alloy components.
  • [0016]
    A metal powder with the following composition has proved effective for use with the method according to the invention, whereby the method is not confined to said composition: Ni61, 4Cr22, 9M08, 8Nb3, 9Fe2, 5Mn0.4Ti0.1, where the alloy comprises 61.4% Ni, 22.9% Cr, 8.8% Mo, 3.9% Nb, 2.5% Fe, 0.4% Mn and 0.1% Ti.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4129680 *Feb 6, 1974Dec 12, 1978Sterndent CorporationChrome dental alloy
US4542539 *Jan 31, 1984Sep 24, 1985Artech Corp.Surgical implant having a graded porous coating
US4661071 *Jun 21, 1984Apr 28, 1987Denpac Corp.Vacuum sintered powder alloy dental prosthetic device and oven to form same
US4863538 *Oct 17, 1986Sep 5, 1989Board Of Regents, The University Of Texas SystemMethod and apparatus for producing parts by selective sintering
US4937928 *Oct 5, 1988Jul 3, 1990Elephant Edelmetaal B.V.Method of making a dental crown for a dental preparation by means of a CAD-CAM system
US5773099 *Apr 25, 1996Jun 30, 1998Injex CorporationDental care material and manufacturing method
US5902441 *Sep 4, 1996May 11, 1999Z CorporationMethod of three dimensional printing
US6322728 *Jul 9, 1999Nov 27, 2001Jeneric/Pentron, Inc.Mass production of dental restorations by solid free-form fabrication methods
US20020015654 *Jun 1, 2001Feb 7, 2002Suman DasDirect selective laser sintering of metals
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7661956Feb 16, 2010Biomet 3I, LlcMethods for manufacturing dental implant components
US7780907Oct 17, 2006Aug 24, 2010Sirona Dental Systems GmbhMethod for producing a denture
US8011925Dec 30, 2009Sep 6, 2011Biomet 3I, LlcMethods for manufacturing dental implant components
US8185224Jun 29, 2006May 22, 2012Biomet 3I, LlcMethod for manufacturing dental implant components
US8206153May 5, 2008Jun 26, 2012Biomet 3I, Inc.Method for selecting implant components
US8221121Jul 11, 2011Jul 17, 2012Biomet 3I, LlcMethod for pre-operative visualization of instrumentation used with a surgical guide for dental implant placement
US8257083Sep 4, 2012Biomet 3I, LlcMethods for placing an implant analog in a physical model of the patient's mouth
US8414296Jun 19, 2012Apr 9, 2013Biomet 3I, LlcMethod for pre-operative visualization of instrumentation used with a surgical guide for dental implant placement
US8479393Nov 5, 2010Jul 9, 2013Ormco CorporationMethod of manufacturing an orthodontic bracket having a laser shaped green body
US8612037Apr 4, 2012Dec 17, 2013Biomet 3I, LlcMethod for manufacturing dental implant components
US8651858Apr 13, 2009Feb 18, 2014Biomet 3I, LlcMethod of creating an accurate bone and soft-tissue digital dental model
US8690574Mar 22, 2011Apr 8, 2014Biomet 3I, LlcMethods for placing an implant analog in a physical model of the patient's mouth
US8777612Nov 14, 2008Jul 15, 2014Biomet 3I, LlcComponents for use with a surgical guide for dental implant placement
US8855800Apr 4, 2012Oct 7, 2014Biomet 3I, LlcMethod for manufacturing dental implant components
US8870574Oct 17, 2013Oct 28, 2014Biomet 3I, LlcMethod of creating an accurate bone and soft-tissue digital dental model
US8871132Mar 5, 2009Oct 28, 2014Ormco CorporationMethods for shaping green bodies and articles made by such methods
US8882508Dec 6, 2011Nov 11, 2014Biomet 3I, LlcUniversal scanning member for use on dental implant and dental implant analogs
US8888488Mar 6, 2013Nov 18, 2014Biomet 3I, LlcMethod for pre-operative visualization of instrumentation used with a surgical guide for dental implant placement
US8926328Dec 27, 2012Jan 6, 2015Biomet 3I, LlcJigs for placing dental implant analogs in models and methods of doing the same
US8931171Jul 8, 2013Jan 13, 2015Ormco CorporationMethod of manufacturing an orthodontic bracket having a laser shaped green body
US8944816May 16, 2012Feb 3, 2015Biomet 3I, LlcTemporary abutment with combination of scanning features and provisionalization features
US8944818May 16, 2012Feb 3, 2015Biomet 3I, LlcTemporary abutment with combination of scanning features and provisionalization features
US8967999Jun 15, 2011Mar 3, 2015Biomet 3I, LlcComponents for use with a surgical guide for dental implant placement
US8998614Jul 20, 2012Apr 7, 2015Biomet 3I, LlcMethods for placing an implant analog in a physical model of the patient's mouth
US9011146Jun 15, 2011Apr 21, 2015Biomet 3I, LlcComponents for use with a surgical guide for dental implant placement
US9089380Jun 22, 2012Jul 28, 2015Biomet 3I, LlcMethod for selecting implant components
US9089382Oct 18, 2012Jul 28, 2015Biomet 3I, LlcMethod and apparatus for recording spatial gingival soft tissue relationship to implant placement within alveolar bone for immediate-implant placement
US9107725Dec 17, 2014Aug 18, 2015Ormco CorporationMethod of manufacturing an orthodontic bracket having a laser shaped green body
US9108361Sep 19, 2014Aug 18, 2015Biomet 3I, LlcMethod for manufacturing dental implant components
US9204941Oct 17, 2013Dec 8, 2015Biomet 3I, LlcMethod of creating an accurate bone and soft-tissue digital dental model
US20060166159 *Jul 29, 2005Jul 27, 2006Norbert AbelsLaser shaping of green metal body used in manufacturing an orthodontic bracket
US20070092854 *Oct 24, 2006Apr 26, 2007Powell Theodore MMethods for manufacturing dental implant components
US20080153067 *Feb 22, 2008Jun 26, 2008Biomet 3I, Inc.Methods for placing an implant analog in a physical model of the patient's mouth
US20080286722 *May 5, 2008Nov 20, 2008Biomet 3I, Inc.Method for selecting implant components
US20090130630 *Nov 14, 2008May 21, 2009Suttin Zachary BComponents for Use with a Surgical Guide for Dental Implant Placement
US20090169841 *Mar 5, 2009Jul 2, 2009Ormco CorporationMethods for shaping green bodies and articles made by such methods
US20090233257 *Oct 17, 2006Sep 17, 2009Christian SchmidtMethod for Producing a Denture
US20110047799 *Nov 5, 2010Mar 3, 2011Ormco CorporationLaser shaped green metal body and orthodontic bracket
US20110129792 *Apr 13, 2009Jun 2, 2011Berckmans Iii BruceMethod of creating an accurate bone and soft-tissue digital dental model
US20110183289 *Jun 29, 2006Jul 28, 2011Implant Innovations, Inc.Method For Manufacting Dental Implant Components
US20110200970 *Aug 18, 2011Biomet 3I, LlcMethods for placing an implant analog in a physical model of the patient's mouth
US20150137400 *Sep 24, 2014May 21, 2015Ormco CorporationMethods for shaping green bodies and articles made by such methods
WO2007045643A1 *Oct 17, 2006Apr 26, 2007Sirona Dental Systems GmbhMethod for producing a denture
Classifications
U.S. Classification148/512
International ClassificationA61C13/00, B22F3/105, A61C13/20
Cooperative ClassificationA61C13/0018, B22F3/1055, A61C13/0003, A61C13/20, Y02P10/295
European ClassificationA61C13/00C, A61C13/00C3L, B22F3/105S