WO1999029281A2 - Verfahren zur herstellung von dentalgusserzeugnissen - Google Patents
Verfahren zur herstellung von dentalgusserzeugnissen Download PDFInfo
- Publication number
- WO1999029281A2 WO1999029281A2 PCT/EP1998/007849 EP9807849W WO9929281A2 WO 1999029281 A2 WO1999029281 A2 WO 1999029281A2 EP 9807849 W EP9807849 W EP 9807849W WO 9929281 A2 WO9929281 A2 WO 9929281A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- particles
- melted
- dental
- casting
- sintered
- 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
- A61C13/20—Methods or devices for soldering, casting, moulding or melting
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
- A61K6/84—Preparations for artificial teeth, for filling teeth or for capping teeth comprising metals or alloys
- A61K6/844—Noble metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1035—Liquid phase sintering
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/70—Tooth crowns; Making thereof
- A61C5/77—Methods or devices for making crowns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
Definitions
- the invention relates to a method for producing a material for dental products according to the preamble of claim 1, a method for producing dental castings according to the preamble of claim 9 and preferred uses.
- Dental products in particular dental castings for dentures (inlays, onlays, crowns, bridges, model castings) and structural parts for implants (superstructures), are usually produced from dental alloys produced by 1 t.
- the previously used dental alloys produced by metallurgy represent materials in the form of semi-finished products, from which either implant components are produced by mechanical processing, for example, or dental castings are produced by casting.
- the materials produced by metallurgical technology may have inaccuracies in their composition due to burning.
- they have the disadvantage in further processing into dental castings that not all alloys can be cast without changing their composition and the melting is energy-intensive.
- problems can arise due to inhomogeneity of the structure.
- metallurgical materials are quite expensive.
- the object of the invention is to create a method which improves the quality of dental products, in particular in terms of metallurgy, and permits the processing of almost all alloys.
- a method for solving this problem has the measures of claim 1.
- the method makes it possible to create materials, in particular semi-finished products, for further processing into dental products.
- the fine particles are preferably only partially melted. As a result, only the outer areas of the particles get a doughy state, which practically welds the particles together during compacting, thereby forming a sintered material for further processing.
- the partial melting of the particles also leads to the fact that they increase their temperature to an insignificant extent in the core and thus thermal structural changes or conversions cannot take place. Sintering therefore does not lead to any noteworthy metallurgical change in the material.
- the particles are at least melted or melted.
- the particles can be melted uniformly over their entire surface, which is preferably done for a short time, so that the particles in the core are hardly influenced thermally and thus do not change their structure during the melting process, or only slightly. This applies in particular if, according to a further proposal of the invention, the particles are melted in an evacuated room (under vacuum) or under protective gas.
- the melt of the starting alloy is then atomized, preferably in water or on rotating and cooled ones Drumming, in a vacuum, under protective gas (argon, nitrogen or the like) or under atmospheric conditions.
- protective gas argon, nitrogen or the like
- a powdery alloy is created by atomizing the melt. This is then compacted, in particular sintered.
- the powdered alloy is filled into a mold and heated. This results in at least partial melting or melting of the particles of the powdery alloy.
- the particle surfaces run in a molten phase or sinter below their melting temperature.
- the compaction or sintering process described can take place with or without pressure.
- the compacting or sintering is preferably carried out in whole or in part in vacuo. However, it is also conceivable to carry out the compacting or sintering at least partially in a normal atmosphere or in a protective gas atmosphere (argon, nitrogen or the like).
- Compacting or sintering creates a coherent, solid material with a compact structure or shape.
- This material forms, in particular, a sintered semi-finished product which is further processed mechanically and / or by casting, in particular to give dental parts.
- a casting material is used for the production of dental castings, which was produced by sintering before the melting required for casting the dental product.
- the cast material sintered according to the invention has the advantage that it is easier to melt for casting. Above all, it is also possible to process dental alloys that would otherwise not be possible to manufacture.
- the casting material which is practically the semi-finished product for casting the desired dental product, is formed from a dental 1 regiment.
- a dental 1 regiment can be alloys based on precious metals (gold, silver, palladium or platinum) or non-precious metal 1 (cobalt-chromium, nickel-chromium, iron or titanium-based).
- the methods according to the invention are particularly suitable for the production of cast dental castings, such as crowns, bridges, model castings, inlays, onlays or superstructures.
- the methods can also be used to produce mechanically processed implant abutments or pins for endodontics.
- Pure metals and alloys come into consideration as materials, in particular noble metal-containing and non-noble metal-containing dental alloys.
- the alloys mentioned are preferably gold, palladium, silver, iron, titanium, cobalt-chromium and / or nickel-chromium-based alloys.
- the method according to the invention is based on the materials mentioned above.
- the (original solid) materials used are first melted. This can be done under normal atmosphere, i.e. under atmospheric conditions, under protective gas (argon, nitrogen or the like) or in a vacuum. This creates a melt with the desired starting alloy.
- the particles are further processed by being mixed into a flowing, gaseous medium, for example a compressed air jet, and atomized in the process. This is preferably done continuously.
- the melt is sprayed in water or on a cooled, rotating roller or drum. Since the melt is atomized into small particles, it is cooled within a very short time, i.e. with high cooling rates. This leads to homogeneous, spherical particles.
- the alloy is preferably atomized under a protective gas, for example in an argon or nitrogen atmosphere. However, it is also conceivable to carry out atomization under atmospheric conditions. Finally, the melt can also be atomized in a vacuum. After atomizing and cooling the melt, a powdery alloy is formed.
- the particles of the powdered alloy can have a grain size in the range from about 1 to 500 ⁇ m.
- the powdered alloy is compacted or sintered.
- the powdered alloy is placed in a mold and heated. This can be done in a vacuum, under normal atmosphere or under protective gas.
- the pulverulent alloy for compacting or sintering is heated such that the particles are only partially melted.
- the particles of the pulverulent alloy are only melted, by heating to a temperature close to their melting temperature.
- the core of the powdered alloy particles remains essentially solid.
- the melting of the surface of the pulverulent particles takes place substantially uniformly, preferably to such an extent that outer edge regions of the pulverulent alloy are not entirely liquid; rather only have a doughy state.
- the particles retain their shape and it is prevented that excessively melted edge areas of the powdered alloy separate from the core by literally dripping.
- the temperature at which the particles are melted is preferably below the solid point.
- the size and weight of the sintered semifinished product is such that it can be processed by the dental technician like conventionally manufactured semifinished products.
- the semi-finished products sintered according to the above-described methods can be used to produce dental products, in particular implant components, from them by mechanical processing.
- the sintered semi-finished product produced by the above method is preferably suitable as a casting material for dental products.
- This casting material which is in the form of a semifinished product, is introduced in an appropriate amount into a crucible of a conventional casting device.
- the sintered semifinished product is melted in the crucible and then the molten cast material is introduced from the crucible in the customary manner into the shape of the dental cast product to be produced, which can be, for example, a crown, a bridge, an inlay, an onlay or a model cast. and preferably in the pressure or centrifugal casting process.
Landscapes
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Dentistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Plastic & Reconstructive Surgery (AREA)
- Engineering & Computer Science (AREA)
- Dental Preparations (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53001999A JP2001510385A (ja) | 1997-12-04 | 1998-12-03 | 歯科鋳造品の製法および歯科鋳造品に使用される材料の製法 |
CA002279426A CA2279426A1 (en) | 1997-12-04 | 1998-12-03 | Method for producing dental castings and for producing a material for dental products, and the utilization thereof |
EP98965746A EP0955989A2 (de) | 1997-12-04 | 1998-12-03 | Verfahren zur herstellung von dentalgusserzeugnissen |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19753706.5 | 1997-12-04 | ||
DE19753706 | 1997-12-04 | ||
DE19819715A DE19819715A1 (de) | 1997-12-04 | 1998-05-02 | Verfahren zur Herstellung von Dentalgußerzeugnissen und zur Herstellung eines Werkstoffs für Dentalerzeugnisse sowie Verwendungen desselben |
DE19819715.2 | 1998-05-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999029281A2 true WO1999029281A2 (de) | 1999-06-17 |
WO1999029281A3 WO1999029281A3 (de) | 1999-09-10 |
Family
ID=26042149
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/007849 WO1999029281A2 (de) | 1997-12-04 | 1998-12-03 | Verfahren zur herstellung von dentalgusserzeugnissen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0955989A2 (de) |
JP (1) | JP2001510385A (de) |
CA (1) | CA2279426A1 (de) |
WO (1) | WO1999029281A2 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9682410B2 (en) | 2010-06-15 | 2017-06-20 | Esg Edelmetall-Service Gmbh & Co Kg | Bar made of noble metal, and production method |
US10130449B2 (en) | 2014-10-09 | 2018-11-20 | Seiko Epson Corporation | Dental casting billet material, metal powder for powder metallurgy, dental metal component, and dental prosthesis |
CN112853131A (zh) * | 2020-12-30 | 2021-05-28 | 有研亿金新材料有限公司 | 一种高纯度低气体含量镍铂合金的制备方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1101865A (en) * | 1964-02-19 | 1968-01-31 | Dow Chemical Co | Improvements in or relating to the manufacture of porous metal articles |
DE3531017A1 (de) * | 1985-08-30 | 1987-03-12 | Nowack Norbert Prof Dr Ing | Direkte herstellung von dentallegierungsgussteilen aus metallpulvermischungen |
US5000779A (en) * | 1988-05-18 | 1991-03-19 | Leach & Garner | Palladium based powder-metal alloys and method for making same |
-
1998
- 1998-12-03 CA CA002279426A patent/CA2279426A1/en not_active Abandoned
- 1998-12-03 JP JP53001999A patent/JP2001510385A/ja active Pending
- 1998-12-03 WO PCT/EP1998/007849 patent/WO1999029281A2/de not_active Application Discontinuation
- 1998-12-03 EP EP98965746A patent/EP0955989A2/de not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1101865A (en) * | 1964-02-19 | 1968-01-31 | Dow Chemical Co | Improvements in or relating to the manufacture of porous metal articles |
DE3531017A1 (de) * | 1985-08-30 | 1987-03-12 | Nowack Norbert Prof Dr Ing | Direkte herstellung von dentallegierungsgussteilen aus metallpulvermischungen |
US5000779A (en) * | 1988-05-18 | 1991-03-19 | Leach & Garner | Palladium based powder-metal alloys and method for making same |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9682410B2 (en) | 2010-06-15 | 2017-06-20 | Esg Edelmetall-Service Gmbh & Co Kg | Bar made of noble metal, and production method |
US10130449B2 (en) | 2014-10-09 | 2018-11-20 | Seiko Epson Corporation | Dental casting billet material, metal powder for powder metallurgy, dental metal component, and dental prosthesis |
CN112853131A (zh) * | 2020-12-30 | 2021-05-28 | 有研亿金新材料有限公司 | 一种高纯度低气体含量镍铂合金的制备方法 |
CN112853131B (zh) * | 2020-12-30 | 2022-07-19 | 有研亿金新材料有限公司 | 一种高纯度低气体含量镍铂合金的制备方法 |
Also Published As
Publication number | Publication date |
---|---|
CA2279426A1 (en) | 1999-06-17 |
EP0955989A2 (de) | 1999-11-17 |
JP2001510385A (ja) | 2001-07-31 |
WO1999029281A3 (de) | 1999-09-10 |
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