WO1999013796A1 - Method and blank for the production of a dental body - Google Patents
Method and blank for the production of a dental body Download PDFInfo
- Publication number
- WO1999013796A1 WO1999013796A1 PCT/SE1998/001660 SE9801660W WO9913796A1 WO 1999013796 A1 WO1999013796 A1 WO 1999013796A1 SE 9801660 W SE9801660 W SE 9801660W WO 9913796 A1 WO9913796 A1 WO 9913796A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blank
- geometry
- restoration body
- machined
- machining
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0022—Blanks or green, unfinished dental restoration parts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
Definitions
- the present invention concerns a procedure for the production by machining of a dental restoration body for use when mending, restoring or building up a tooth or row of teeth, as well as a blank intended for the production of the dental restoration body by machining.
- Numerically-controlled machine tools are today used for producing dental restoration bodies such as crowns for building up a tooth and inserts for filling a drilled-out or damaged tooth. These machine tools commonly employ what is known as CAM technology.
- the restoration body is built-up in a software program, and with knowledge of the geometry of a worked piece or a blank, the computer can work out a pattern of movements for a known machine tool, usually a milling or grinding tool, that by cutting away at the blank, produces the desired restoration body.
- zirconium Zr0 2 . Blanks of zirconium ceramic can be produced in several shades of colour that resemble those of teeth and, like several other candidate ceramics, it is a hard material that is very resistant to being worn down.
- the blank is at present commonly a cylindrical body with a specified diameter and extension.
- the turning of the blank at its point of attachment is thus not of significance. Instead, what is influential regarding the position of the blank is how far it projects out from its attachment. Describing this spatial position and the geometry for a CAM system is easy.
- the small dimensions and the detailed shaping of restoration bodies for dental care place just such high demands on the machine tool.
- the forming of shapes complementary to, for example, a hole drilled in a tooth or a tooth ground-down to accommodate a crown, requires great accuracy in the machining.
- An abrasive circular tool with a diameter of 1 mm can be named as an example of a tool that can be used.
- the small dimensions and a relatively long free projection are necessary to achieve the details in the surface structure and to gain access all around the body.
- the problem of machine tool wear is especially evident when producing a crown.
- the underneath of a crown is provided with a cavity for accommodating a ground-down tooth or other type of attachment. Gaining access to the cavity is a machine tooling operation that is time- consuming and hard on the wear of the tool.
- the development of heat at prolonged, locally situated machining brings with it a significant risk of crack formation. If cracks form, the result will not be acceptable and the production has to be started afresh with a new blank.
- the problems with current blanks are: that the hardness of the blank leads to significant wear of the machine tool and prolongs the time required for the machining operation: that the cylindrical shape of the blank leads requires a large amount of rough cutting before the actual shaping can begin: and that cracks tend to form in the material when machining holes or cavities.
- These problems act to raise the cost of producing restoration bodies by machining in general, and in particular when the bodies are made of hard materials such as ceramics.
- the objective of the present invention is to overcome these problems and achieve a blank intended for producing dental restoration bodies by machining that permits reduced machining time and reduces the wear on the tools.
- An additional objective of the invention is to achieve a blank whose characteristics can be read by a machine.
- a further objective is to achieve a blank that can be stored in a magazine for mechanical/automated loading to a position for machining.
- Fig. 1 shows schematically a system for performing the procedure according to the present invention.
- Fig. 2 shows a side view of a blank according to one embodiment of the present invention.
- Fig. 3 shows an end view of the blank according to fig. 2.
- Fig. 4 shows a perspective view from an angle at the front of the blank according to fig. 2.
- Fig. 5 shows a further perspective view of the blank according to fig. 2.
- Fig. 1 shows schematically a system for producing dental restoration bodies.
- the system includes a computer (not shown) for transforming geometric information about a specified restoration body and a specified blank to a pattern of movements for a specified machine tool; as well as a numerically-controlled machine tool 2 for performing the machining. It is advantageous if the tool has several axes of rotation for both the tool holder 3 and the blank holder 4.
- the blank according to the present embodiment is shown schematically in figs. 2 to 4.
- the blank has a section for attaching firmly that includes a cylindrical part 5 intended for setting up in the machine tool.
- a cylindrical part 5 intended for setting up in the machine tool.
- the cylindrical part 5 is grasped in the traditional manner by the holding chuck 4 for the blank in the machine tool.
- the centre axis of the cylindrical part thus coincides with the axis of rotation commonly present in the chuck for the blank.
- the part intended for machining 7 has a roughly pre-formed geometry for different types of dental restoration bodies.
- the part to be machined 7 has an essentially rectangular cross-sectional shape when seen in a section at right angles to the axis of the blank 6.
- the rectangular shape reduces the need for rough cutting when producing crowns, for example, in comparison with a blank with a circular cross-section.
- the blank is preferably available in a set of different sizes of the machined part 7 to minimise machining when producing the dental restoration body in question.
- a thinner waist of material 8 is arranged between the cylindrical part 5 and the machined part 7.
- the waist has a smaller cross-sectional area at its surface than both the cylindrical part and the machined part.
- the blank In order that the blank can be handled mechanically in a numerically-controlled machine, it is provided with means for controlling its orientation. These can include means that are complementary in relation to means arranged on a supporting device, such as. for example, a magazine for blanks, a blank holder, a transport belt for blanks or similar. It can thus be ensured that the blank, when it is located in a magazine, for example, is always oriented in the same way and that it can be collected from that point or delivered in a specified orientation. The exact position and orientation of the blank is thus known to the machine tool and to the software program that controls it.
- the device for controlling orientation includes a recess 9 arranged in a specified position.
- the recess 9 is positioned at the blank so that when the blank is introduced into a magazine 10 with the correct orientation, the recess accommodates a projection arranged in the magazine. If, however, the blank is not orientated in the pre-determined way when it enters the magazine, the projection of the magazine will prevent the blank from entering the magazine, when the risk of an incorrectly orientated blank is eliminated. That referred to as the human factor has been eliminated as a source of error.
- the blank according to the present invention includes a collar 11 that interacts with the supporting device.
- the aim of the collar is to interact with the supporting device even when the machining of the body has been completed so that the machined body, with or without the shaped body, can be mechanically transported to the magazine and kept there.
- the blank has a collar to be accommodated in the complementary shaped device of the magazine and a recess for guiding its orientation and interaction with a complementary device in the magazine.
- the recess that specifies direction can be replaced by a projection and the collar can be replaced by a groove or waist, whereby the complementary formed devices arranged in the magazine achieve the function named above.
- the blank has a recess 12 arranged in the part intended for machining 7.
- the recess 12 is arranged on a surface parallel with the axis of the blank 6 and is essentially pyramid or cone-shaped with a centre axis arranged at right angles to the axis of the blank 6. In this way, the rough cutting that takes place prior to the machined shaping of the cavity of the crown for accommodating the ground-down stump of a tooth or other point of attachment is reduced.
- the recess can even be arranged, for example, at the free end of the machined part 7, whereby an axis of symmetry for the recess or hole can coincide or be parallel with the axis of the blank 6.
- the blank has a machine-readable code that corresponds to a code key.
- the key to the code is in turn preferably arranged in machine-readable code form, e.g. a computer file of information that can be fed into the computer system that controls the procedure and the machine tool.
- the code for the blank is arranged at the attachment part 5.
- the code includes a flat area 13 that extends out from the free end of the cylindrical attachment part for a known distance in towards the attachment point.
- the flat section is arranged at a known distance from the axis of the blank 6 that is less than the radius of the attachment part.
- the blanks arranged in the magazine, supported by the collars and with their attachment parts extending outwards can in this way be read by a machine and their characteristics compared with awaiting orders for working dental restoration bodies .
- the flat surface can advantageously be read using laser measurement technology. Even other remote methods of measurement or contact- based methods of measurement can be used without departing from the scope of the invention.
- the code information can even be arranged on another position on the blank, e.g. be applied to the blank in the form of a bar code or a groove or a ridge, whereby the latter two examples can employ three co-ordinates (length, width and depth/height).
- the flat surface named above can be given a collar and thereby be used as a stop for rotation.
- the blank is shaped and its colour is determined by chosen ingredients. Following this, the blank is baked at about 1600 °C. It is preferable that the coding takes place as early as possible, which is why a coding that can withstand the temperature of baking is desirable.
- a coding expressed via geometric changes of shape or combinations of such changes applied to the blank prior to the baking is one preferred solution to the problem of achieving the coding of the colour, dimensions and other characteristics of the blank as early as possible during the production of the blank.
- the position of the coding is determined by how the blank is handled on the path to the blank holder in the machine tool.
- the code must be accessible when the reading takes place. If all the characteristics, for example, are read after the blank has been loaded into the magazine, it is important that the code is accessible for reading when the blank is located in the magazine. If, however, the code is read prior to introduction into the magazine, the coding can be positioned at another place on the blank and can be hidden when the blank is located in the magazine.
- the blank can be provided with a pre-formed cut-out recess or groove at a specified position and with specified dimensions intended as an attachment point for other dental restoration bodies.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98944410A EP1018974A1 (en) | 1997-09-17 | 1998-09-16 | Method and blank for the production of a dental body |
AU91953/98A AU9195398A (en) | 1997-09-17 | 1998-09-16 | Method and blank for the production of a dental body |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9703353A SE9703353L (en) | 1997-09-17 | 1997-09-17 | Procedure and subject in machine manufacture of dental restoration body |
SE9703353-4 | 1997-09-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999013796A1 true WO1999013796A1 (en) | 1999-03-25 |
Family
ID=20408278
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1998/001660 WO1999013796A1 (en) | 1997-09-17 | 1998-09-16 | Method and blank for the production of a dental body |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1018974A1 (en) |
AU (1) | AU9195398A (en) |
SE (1) | SE9703353L (en) |
WO (1) | WO1999013796A1 (en) |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001032093A1 (en) * | 1999-11-02 | 2001-05-10 | Jeneric/Pentron Incorporated | Cad/cam blocks in the manufacture of dental materials |
WO2001058378A1 (en) * | 2000-02-08 | 2001-08-16 | Zahn Spektrum Entwicklungsgesellschaft Für Dentalprodukte Mbh | Assortment of teeth and method for preparing teeth |
EP1208811A1 (en) * | 1999-08-02 | 2002-05-29 | Kabushiki Kaisya Advance | Method of fabricating dental prosthetic appliance and method of installing measuring object and measuring device |
WO2002076328A1 (en) * | 2001-03-23 | 2002-10-03 | Decim Ab | An apparatus and a method for producing a dental restoration |
WO2004016189A1 (en) * | 2002-07-22 | 2004-02-26 | Sirona Dental Systems Gmbh | Measuring device for a model and machining device equipped with the same |
WO2005002463A1 (en) * | 2003-07-07 | 2005-01-13 | Sirona Dental Systems Gmbh | Blank for producing dental shaped parts and method for producing the shaped part |
EP1674047A1 (en) * | 2004-12-23 | 2006-06-28 | Sirona Dental Systems GmbH | Blank for producing dental shaped parts and method for producing the shaped part |
WO2006084066A2 (en) * | 2005-02-01 | 2006-08-10 | D4D Technologies, Lp | Mill blank |
WO2006120254A3 (en) * | 2005-05-13 | 2007-03-22 | Sirona Dental Systems Gmbh | Method for production of a tooth replacement piece and a tooth replacement piece produced by said method and a blank for production of a tooth replacement piece |
DE102006040798A1 (en) * | 2006-08-31 | 2008-03-20 | Merz Dental Gmbh | side approach |
DE102007036279A1 (en) * | 2007-07-31 | 2009-02-05 | Sirona Dental Systems Gmbh | Blank with coding for dental work has position, dimensions or type of structure such that determined parameter value corresponds to analogous information about property of blank body |
WO2009016223A2 (en) * | 2007-07-31 | 2009-02-05 | Sirona Dental Systems Gmbh | Blank with encoding and method for manufacturing a dental moulded component |
WO2009121952A1 (en) * | 2008-04-03 | 2009-10-08 | Sirona Dental Systems Gmbh | Method for processing a blank with an individual enlargement factor and blank therefor |
DE102010002916A1 (en) | 2010-03-16 | 2011-09-22 | Sirona Dental Systems Gmbh | Blank with coding for the production of dental moldings and method for the identification of a blank |
US8186998B2 (en) | 2003-05-19 | 2012-05-29 | Sirona Dental Systems Gmbh | Blank-holding means and method of surveying same |
JP5964533B1 (en) * | 2015-08-31 | 2016-08-03 | 株式会社松風 | Dental restoration production system for producing a dental restoration from a dental workpiece having a through hole, an operation method of the system, a program for the system, and a dental workpiece to be used in the system |
US10258440B2 (en) | 2015-09-08 | 2019-04-16 | James R. Glidewell Dental Ceramics, Inc. | Method of making dental restorations from sintered preforms |
WO2020182816A1 (en) * | 2019-03-11 | 2020-09-17 | Kulzer Gmbh | Blank for producing a dental restoration and method for producing the blank |
US11045291B2 (en) | 2015-08-03 | 2021-06-29 | James R. Glidewell Dental Ceramics, Inc. | Dental restoration preform and method of making the same |
EP4134040A1 (en) | 2021-08-09 | 2023-02-15 | Ivoclar Vivadent AG | Milling blank and method for producing a dental restoration from a milling blank |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996037163A1 (en) * | 1995-05-22 | 1996-11-28 | Siemens Aktiengesellschaft | Process and device for the computer-assisted restoration of teeth |
WO1997027818A1 (en) * | 1996-01-31 | 1997-08-07 | Dominique Choplin | Method for making dental prostheses |
-
1997
- 1997-09-17 SE SE9703353A patent/SE9703353L/en not_active IP Right Cessation
-
1998
- 1998-09-16 EP EP98944410A patent/EP1018974A1/en not_active Withdrawn
- 1998-09-16 AU AU91953/98A patent/AU9195398A/en not_active Abandoned
- 1998-09-16 WO PCT/SE1998/001660 patent/WO1999013796A1/en not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996037163A1 (en) * | 1995-05-22 | 1996-11-28 | Siemens Aktiengesellschaft | Process and device for the computer-assisted restoration of teeth |
WO1997027818A1 (en) * | 1996-01-31 | 1997-08-07 | Dominique Choplin | Method for making dental prostheses |
Cited By (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6766217B1 (en) | 1999-08-02 | 2004-07-20 | Kabushiki Kaisya Advance | Method of manufacturing dental prosthesis, method of placing object for measurement and measuring device |
EP1208811A1 (en) * | 1999-08-02 | 2002-05-29 | Kabushiki Kaisya Advance | Method of fabricating dental prosthetic appliance and method of installing measuring object and measuring device |
EP1208811A4 (en) * | 1999-08-02 | 2004-03-31 | Advance Kk | Method of fabricating dental prosthetic appliance and method of installing measuring object and measuring device |
WO2001032093A1 (en) * | 1999-11-02 | 2001-05-10 | Jeneric/Pentron Incorporated | Cad/cam blocks in the manufacture of dental materials |
WO2001058378A1 (en) * | 2000-02-08 | 2001-08-16 | Zahn Spektrum Entwicklungsgesellschaft Für Dentalprodukte Mbh | Assortment of teeth and method for preparing teeth |
WO2002076328A1 (en) * | 2001-03-23 | 2002-10-03 | Decim Ab | An apparatus and a method for producing a dental restoration |
US7178731B2 (en) | 2002-07-22 | 2007-02-20 | Sirona Dental Systems Gmbh | Measuring device for a model and machining device equipped with the same |
WO2004016189A1 (en) * | 2002-07-22 | 2004-02-26 | Sirona Dental Systems Gmbh | Measuring device for a model and machining device equipped with the same |
DE10322762B4 (en) * | 2003-05-19 | 2013-12-05 | Sirona Dental Systems Gmbh | Holder for a blank and method for measuring the position and orientation of the holder |
US8186998B2 (en) | 2003-05-19 | 2012-05-29 | Sirona Dental Systems Gmbh | Blank-holding means and method of surveying same |
WO2005002463A1 (en) * | 2003-07-07 | 2005-01-13 | Sirona Dental Systems Gmbh | Blank for producing dental shaped parts and method for producing the shaped part |
US8893387B2 (en) | 2003-07-07 | 2014-11-25 | Sirona Dental Systems Gmbh | Method for producing a dental shaped part |
US8057912B2 (en) | 2003-07-07 | 2011-11-15 | Sirona Dental Systems Gmbh | Blank for producing dental shaped parts and method for producing the shaped part |
JP2009513174A (en) * | 2003-07-07 | 2009-04-02 | ジロナ デンタール システムス ゲゼルシャフト ミット ベシュレンクテル ハフツング | Blank for manufacturing a dental technical molded part and method for manufacturing the molded part |
EP1674047A1 (en) * | 2004-12-23 | 2006-06-28 | Sirona Dental Systems GmbH | Blank for producing dental shaped parts and method for producing the shaped part |
JP2006175238A (en) * | 2004-12-23 | 2006-07-06 | Sirona Dental Systems Gmbh | Blank for manufacturing dental technical formed part and method for manufacturing formed part |
US7985119B2 (en) | 2004-12-23 | 2011-07-26 | Sirona Dental Systems Gmbh | Blank for the production of a dental shaped body and method of producing said shaped body |
US8673454B2 (en) | 2004-12-23 | 2014-03-18 | Sirona Dental Systems Gmbh | System for producing a dental-shaped body |
WO2006084066A2 (en) * | 2005-02-01 | 2006-08-10 | D4D Technologies, Lp | Mill blank |
WO2006084066A3 (en) * | 2005-02-01 | 2006-10-19 | D4D Technologies Lp | Mill blank |
WO2006120254A3 (en) * | 2005-05-13 | 2007-03-22 | Sirona Dental Systems Gmbh | Method for production of a tooth replacement piece and a tooth replacement piece produced by said method and a blank for production of a tooth replacement piece |
DE102006040798A1 (en) * | 2006-08-31 | 2008-03-20 | Merz Dental Gmbh | side approach |
WO2009016223A3 (en) * | 2007-07-31 | 2009-05-22 | Sirona Dental Systems Gmbh | Blank with encoding and method for manufacturing a dental moulded component |
US10149746B2 (en) * | 2007-07-31 | 2018-12-11 | Dentsply Sirona Inc. | Method of manufacturing a molded dental component from a blank |
US20160067017A1 (en) * | 2007-07-31 | 2016-03-10 | Sirona Dental Systems Gmbh | Blank with encoding and method of manufacturing a molded dental component |
WO2009016223A2 (en) * | 2007-07-31 | 2009-02-05 | Sirona Dental Systems Gmbh | Blank with encoding and method for manufacturing a dental moulded component |
DE102007036279A1 (en) * | 2007-07-31 | 2009-02-05 | Sirona Dental Systems Gmbh | Blank with coding for dental work has position, dimensions or type of structure such that determined parameter value corresponds to analogous information about property of blank body |
US9155598B2 (en) | 2007-07-31 | 2015-10-13 | Sirona Dental Systems Gmbh | Blank with encoding and method of manufacturing a molded dental component |
WO2009121952A1 (en) * | 2008-04-03 | 2009-10-08 | Sirona Dental Systems Gmbh | Method for processing a blank with an individual enlargement factor and blank therefor |
US8401690B2 (en) | 2008-04-03 | 2013-03-19 | Sirona Dental Systems Gmbh | Method for machining a blank having an individual scale-up factor and blank therefor |
AU2009232050B2 (en) * | 2008-04-03 | 2013-12-05 | Sirona Dental Systems Gmbh | Method for machining a blank having an individual scale-up factor, and blank therefor |
EP2929856A1 (en) | 2010-03-16 | 2015-10-14 | Sirona Dental Systems GmbH | Method for identifying a blank |
WO2011113864A1 (en) | 2010-03-16 | 2011-09-22 | Sirona Dental Systems Gmbh | Blank with coding for producing shaped parts for use in dentistry, and method for identifying a blank |
US9492251B2 (en) | 2010-03-16 | 2016-11-15 | Sirona Dental Systems Gmbh | Blank with coding for the production of tooth-technical shaped parts and procedures for the identification of a blank |
US10045840B2 (en) | 2010-03-16 | 2018-08-14 | Sirona Dental Systems GMBH. | Blank with coding for the production of tooth-technical shaped parts and procedures for the identification of a blank |
DE102010002916A1 (en) | 2010-03-16 | 2011-09-22 | Sirona Dental Systems Gmbh | Blank with coding for the production of dental moldings and method for the identification of a blank |
US11045291B2 (en) | 2015-08-03 | 2021-06-29 | James R. Glidewell Dental Ceramics, Inc. | Dental restoration preform and method of making the same |
JP5964533B1 (en) * | 2015-08-31 | 2016-08-03 | 株式会社松風 | Dental restoration production system for producing a dental restoration from a dental workpiece having a through hole, an operation method of the system, a program for the system, and a dental workpiece to be used in the system |
US10258440B2 (en) | 2015-09-08 | 2019-04-16 | James R. Glidewell Dental Ceramics, Inc. | Method of making dental restorations from sintered preforms |
US10973616B2 (en) | 2015-09-08 | 2021-04-13 | James R. Glidewell Dental Ceramics, Inc. | Method of making dental restorations from sintered preforms |
US11266485B2 (en) | 2015-09-08 | 2022-03-08 | James R. Glidewell Dental Ceramics, Inc. | Method of making dental restorations from sintered preforms |
WO2020182816A1 (en) * | 2019-03-11 | 2020-09-17 | Kulzer Gmbh | Blank for producing a dental restoration and method for producing the blank |
EP4134040A1 (en) | 2021-08-09 | 2023-02-15 | Ivoclar Vivadent AG | Milling blank and method for producing a dental restoration from a milling blank |
Also Published As
Publication number | Publication date |
---|---|
SE9703353D0 (en) | 1997-09-17 |
EP1018974A1 (en) | 2000-07-19 |
AU9195398A (en) | 1999-04-05 |
SE509208C2 (en) | 1998-12-14 |
SE9703353L (en) | 1998-12-14 |
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