CA2279426A1 - Method for producing dental castings and for producing a material for dental products, and the utilization thereof - Google Patents
Method for producing dental castings and for producing a material for dental products, and the utilization thereof Download PDFInfo
- Publication number
- CA2279426A1 CA2279426A1 CA002279426A CA2279426A CA2279426A1 CA 2279426 A1 CA2279426 A1 CA 2279426A1 CA 002279426 A CA002279426 A CA 002279426A CA 2279426 A CA2279426 A CA 2279426A CA 2279426 A1 CA2279426 A1 CA 2279426A1
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- dental
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- alloy
- melting
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- 239000000463 material Substances 0.000 title claims abstract description 43
- 238000005266 casting Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000002844 melting Methods 0.000 claims abstract description 18
- 230000008018 melting Effects 0.000 claims abstract description 17
- 239000011265 semifinished product Substances 0.000 claims abstract description 16
- 239000000047 product Substances 0.000 claims abstract description 9
- 239000007943 implant Substances 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims description 29
- 229910045601 alloy Inorganic materials 0.000 claims description 29
- 239000010970 precious metal Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 6
- 239000003564 dental alloy Substances 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- WAIPAZQMEIHHTJ-UHFFFAOYSA-N [Cr].[Co] Chemical compound [Cr].[Co] WAIPAZQMEIHHTJ-UHFFFAOYSA-N 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910000684 Cobalt-chrome Inorganic materials 0.000 claims description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 claims description 2
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims description 2
- 239000010952 cobalt-chrome Substances 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 238000010298 pulverizing process Methods 0.000 claims description 2
- 239000007858 starting material Substances 0.000 claims 1
- 239000000758 substrate Substances 0.000 claims 1
- 239000010419 fine particle Substances 0.000 abstract description 3
- 239000000470 constituent Substances 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000005245 sintering Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000000155 melt Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 235000011837 pasties Nutrition 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000009750 centrifugal casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229940023487 dental product Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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
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
Common metallurgically produced materials are utilized in the production of dental products. During production, however, not all of the material can be utilized. When the material is subsequently processed by casting, a lot of energy is required for melting. The invention relates to a method for producing dental castings or a material for dental castings. According to the invention, fine particles of the material are to be partially fused and the fused particles are to be compacted. This results in a sintered semifinished product. During subsequent processing using casting techniques, this sintered semifinished product can be easily cast into dental castings in a pot of a casting device.
The sintered semifinished product offers a good homogeneity during mechanical subsequent processing. The sintered semifinished products produced according to the inventive method are suited for all dental products which are produced by means of casting, especially for implant constituents, crowns, bridges and model casts.
The sintered semifinished product offers a good homogeneity during mechanical subsequent processing. The sintered semifinished products produced according to the inventive method are suited for all dental products which are produced by means of casting, especially for implant constituents, crowns, bridges and model casts.
Description
PCT/EP98/07849 / 98 965 746.5 Method for preparing dental casts and for producing a material for use in dental casts Description The invention relates to a method for producing a material for dental products in accordance with the first portion of claim 1, a method for preparing dental casts pursuant to the first portion of claim 9, and preferred uses thereof.
Dental products, in particular dental casts for tooth restorations (inlays, onlays, crowns, bridges and partial dentures) and abutment parts for implants (superconstructions), are usually made from dental alloys produced by smelting techniques.
These dental alloys used hitherto and made by smelting are materials in the form of semi-finished products that are either mechanically manipulated to make implant abutments, for example, or cast to form dental casts. Melting loss sometimes causes inaccuracies in the composition of smelted materials.
Further disadvantages of such materials when making dental casts are that not all alloys can be cast without changes occurring in their composition, and the fact that large amounts of energy are required in order to melt such materials. Problems may arise during mechanical processing of semi-finished products as a result of structural irregularities. Furthermore, materials made by smelting are expensive.
From this basis, the object of the invention is to create a method that improves the quality of dental products, particularly their metallurgical properties, and that permits almost any alloy to be processed.
The steps in claim 1 comprise a method for achieving this object. By at least partially melting, i.e. surface melting the fine particles of the material and subsequently compacting said particles, a sintered material (semi-finished product) is formed that is characterised by good homogeneity and can be produced inexpensively. If this sintered material is used as a casting material for preparing dental casts, it can be melted quickly and to good effect to form a liquid casting material from which the dental products can then be cast. The method enables materials to be made, in particular semi-finished products, that can be worked up into dental products.
' o CA 02279426 1999-07-26 _2_ Preferably, the fine particles are only partially surface melted. In this way, the outer areas of the particle obtain a pasty consistency, whereupon the particles are effectively welded together by compacting, thus forming a sintered material for further processing. Partially surface melting the particles also means that the cores of the particles are not subjected to any significant temperature rise and hence that thermally induced modifications or transformations of their structure are unable to occur. For this reason, sintering produces negligible changes in the metallurgical properties of the material.
In one preferred method, the particles are at least partially melted at the surface or totally melted. The particles can be melted evenly over their entire surface, which is preferably done within a short time so that the cores of the particles are thermally affected to a minimal extent, with the result that their structure alters insignificantly or not at all during partial melting.
This is especially the case when, pursuant to a further proposal of the invention, the particles are partially melted in an evacuated vessel (under vacuum) or in an atmosphere of protective gas.
The molten mass of the initial alloy is then pulverised, preferably in water or on rotating, cooled drums, specifically in a vacuum, a protective gas ' atmosphere (argon, nitrogen or the like) or under atmospheric conditions.
Pulverising the molten mass produces an alloy in powdery form. This powdery, pulverised alloy is then compacted, that is to say, sintered. This is done by filling the powdery alloy into a mould and heating it. This causes the particles in the powdery alloy to partially melt or to surface melt. The particle surfaces fuse together in a molten phase, or are sintered below their-melting point. The process of compacting or sintering described in the foregoing may be carried out under pressurised or non-pressurised conditions. Preferably, compacting and sintering are performed wholly or partially in a vacuum. However, it is also conceivable that compacting and sintering is carried out at least partially in a standard atmosphere or in an atmosphere of protective gas (argon, nitrogen or the like).
Compacting or sintering produces a coherent, solid material with a compact structure and shape. In particular, said material forms a sintered semi-finished product that is further processed by mechanical treatment and/or by casting, specifically to form dental parts.
' ~ CA 02279426 1999-07-26 Another method for solving the technical problem of the invention is to perform the steps specified in claim 9. According to said claim, dental casts are prepared using a casting material that is made by sintering prior to the melting necessary to cast the dental product. The advantage of the sintered casting material according to the invention, compared to conventional casting materials made by smelting, is that the sintered material is easier to melt for casting purposes. Above all, it is also possible to form dental alloys that could not otherwise be produced.
The material for casting, which for practical purposes is the semi-finished product for making the dental casts required, is formed from a dental alloy.
These alloys may have a precious metal base (gold, silver, palladium or platinum) or a non-precious metal base (cobalt-chrom, nickel-chromium, iron or titanium).
Below, the invention is described in greater detail with reference to a preferred embodiment.
The methods of the present invention are particularly suited for preparing various kinds of dental cast, examples being crowns, bridges, partial dentures, inlays, onlays or superconstructions. Furthermore, the methods may also be applied in making implant abutments or pins for endodontics by mechanical manipulation.
Possible materials are pure metals and alloys, especially dental alloys containing precious metals and non-precious metals. Said alloys are preferably basic gold, palladium, silver, iron, titanium, cobalt-chromium.
and/or nickel-chromium alloys.
In the method of the present invention, it is assumed that the aforementioned materials will be used. In a first step, the (initially solid) materials deployed are totally melted. This step may be performed in a standard atmosphere, in other words normal atmospheric conditions, in a protective gas atmosphere (argon, nitrogen or the like), or in a vacuum. The result is a molten mass of the initial alloy required.
~
' ~ CA 02279426 1999-07-26 The particles are further processed by exposing them to a flowing gaseous medium, for example a jet of compressed air, as a result of which the particles are pulverised. The latter process is preferably continuous. The molten mass is pulverised in water or on a cooled, rotating roller or drum.
Since the melt is pulverised to small particles, it is cooled down within a short time, that is to say, at a high cooling rate. This leads to homogenous, spherically shaped particles.
The alloy is preferably pulverised in an atmosphere of protective gas, for example argon or nitrogen. However, it is also conceivable that pulverisation be carried out under normal atmospheric conditions. Alternatively, the melt can be pulverised in a vacuum. After the melt has been pulverised and cooled, an alloy in powdery form is obtained. The size of the powdery alloy particles can range from approximately 1 to 600 Nm.
In a subsequent step of the method, the powdery alloy is compacted and/or sintered. This is done by filling the powdery alloy into a mould and heating it. Once again, this can be carried out in a vacuum, a standard atmosphere or in a protective gas atmosphere. The powdery alloy is heated for compacting and/or sintering in such a way that the particles are only partially melted. Preferably, the particles of powdery alloy are only partially melted, specifically by heating them to a temperature slightly below their melting point. This enables the core of the powdery alloy particles to remain essentially solid. The surfaces of the powdery particles are heated evenly, preferably to a state in which peripheral areas of the powdery alloy are not quite liquid, but rather acquire a pasty consistency. This enables the particles to retain their shape and prevents peripheral areas of the powdery-alloy from separating from the core by dripping off. Another aspect is that, by heating the powdery alloy particles until their outer surfaces acquire a pasty consistency, the particles undergo negligible structural transformation and the chemical composition does not change. This is preferably achieved by keeping the temperature at which the particles are partly melted under the solidus point..
During compacting, the powdery particles of the alloy sinter below their melting point and congeal as a result. A compact, coherent and solid material is produced that qualifies as a sintered semi-finished product. The process of compacting or sintering may be carried out under pressurised or non-pressurised conditions.
The sintered semi-finished product has a size and weight that enables a dental technician to manipulate it in the same way as conventional semi-finished products made by smelting.
The semi-finished products sintered according to the method described in the foregoing may be worked up mechanically to prepare dental products, in particular implant abutments.
TIIG J~iii2r2u Sciiil-iiiilSilct~ piOG~iiCi Jiiau2 aCCOfdiri9 i0 the iilcti 0d ~2SCriu2d above is preferentially suitable as a material for dental casts. An appropriate amount of this casting material in semi-finished form is placed in the crucible of a conventional casting device. The sintered semi-finished product is melted in the crucible and the molten casting material is then poured in the usual manner from the crucible into the mould for the dental cast, which may be a crown, a bridge, an inlay, an onlay or a partial denture, whereby the preferable method is pressure or centrifugal casting.
Dental products, in particular dental casts for tooth restorations (inlays, onlays, crowns, bridges and partial dentures) and abutment parts for implants (superconstructions), are usually made from dental alloys produced by smelting techniques.
These dental alloys used hitherto and made by smelting are materials in the form of semi-finished products that are either mechanically manipulated to make implant abutments, for example, or cast to form dental casts. Melting loss sometimes causes inaccuracies in the composition of smelted materials.
Further disadvantages of such materials when making dental casts are that not all alloys can be cast without changes occurring in their composition, and the fact that large amounts of energy are required in order to melt such materials. Problems may arise during mechanical processing of semi-finished products as a result of structural irregularities. Furthermore, materials made by smelting are expensive.
From this basis, the object of the invention is to create a method that improves the quality of dental products, particularly their metallurgical properties, and that permits almost any alloy to be processed.
The steps in claim 1 comprise a method for achieving this object. By at least partially melting, i.e. surface melting the fine particles of the material and subsequently compacting said particles, a sintered material (semi-finished product) is formed that is characterised by good homogeneity and can be produced inexpensively. If this sintered material is used as a casting material for preparing dental casts, it can be melted quickly and to good effect to form a liquid casting material from which the dental products can then be cast. The method enables materials to be made, in particular semi-finished products, that can be worked up into dental products.
' o CA 02279426 1999-07-26 _2_ Preferably, the fine particles are only partially surface melted. In this way, the outer areas of the particle obtain a pasty consistency, whereupon the particles are effectively welded together by compacting, thus forming a sintered material for further processing. Partially surface melting the particles also means that the cores of the particles are not subjected to any significant temperature rise and hence that thermally induced modifications or transformations of their structure are unable to occur. For this reason, sintering produces negligible changes in the metallurgical properties of the material.
In one preferred method, the particles are at least partially melted at the surface or totally melted. The particles can be melted evenly over their entire surface, which is preferably done within a short time so that the cores of the particles are thermally affected to a minimal extent, with the result that their structure alters insignificantly or not at all during partial melting.
This is especially the case when, pursuant to a further proposal of the invention, the particles are partially melted in an evacuated vessel (under vacuum) or in an atmosphere of protective gas.
The molten mass of the initial alloy is then pulverised, preferably in water or on rotating, cooled drums, specifically in a vacuum, a protective gas ' atmosphere (argon, nitrogen or the like) or under atmospheric conditions.
Pulverising the molten mass produces an alloy in powdery form. This powdery, pulverised alloy is then compacted, that is to say, sintered. This is done by filling the powdery alloy into a mould and heating it. This causes the particles in the powdery alloy to partially melt or to surface melt. The particle surfaces fuse together in a molten phase, or are sintered below their-melting point. The process of compacting or sintering described in the foregoing may be carried out under pressurised or non-pressurised conditions. Preferably, compacting and sintering are performed wholly or partially in a vacuum. However, it is also conceivable that compacting and sintering is carried out at least partially in a standard atmosphere or in an atmosphere of protective gas (argon, nitrogen or the like).
Compacting or sintering produces a coherent, solid material with a compact structure and shape. In particular, said material forms a sintered semi-finished product that is further processed by mechanical treatment and/or by casting, specifically to form dental parts.
' ~ CA 02279426 1999-07-26 Another method for solving the technical problem of the invention is to perform the steps specified in claim 9. According to said claim, dental casts are prepared using a casting material that is made by sintering prior to the melting necessary to cast the dental product. The advantage of the sintered casting material according to the invention, compared to conventional casting materials made by smelting, is that the sintered material is easier to melt for casting purposes. Above all, it is also possible to form dental alloys that could not otherwise be produced.
The material for casting, which for practical purposes is the semi-finished product for making the dental casts required, is formed from a dental alloy.
These alloys may have a precious metal base (gold, silver, palladium or platinum) or a non-precious metal base (cobalt-chrom, nickel-chromium, iron or titanium).
Below, the invention is described in greater detail with reference to a preferred embodiment.
The methods of the present invention are particularly suited for preparing various kinds of dental cast, examples being crowns, bridges, partial dentures, inlays, onlays or superconstructions. Furthermore, the methods may also be applied in making implant abutments or pins for endodontics by mechanical manipulation.
Possible materials are pure metals and alloys, especially dental alloys containing precious metals and non-precious metals. Said alloys are preferably basic gold, palladium, silver, iron, titanium, cobalt-chromium.
and/or nickel-chromium alloys.
In the method of the present invention, it is assumed that the aforementioned materials will be used. In a first step, the (initially solid) materials deployed are totally melted. This step may be performed in a standard atmosphere, in other words normal atmospheric conditions, in a protective gas atmosphere (argon, nitrogen or the like), or in a vacuum. The result is a molten mass of the initial alloy required.
~
' ~ CA 02279426 1999-07-26 The particles are further processed by exposing them to a flowing gaseous medium, for example a jet of compressed air, as a result of which the particles are pulverised. The latter process is preferably continuous. The molten mass is pulverised in water or on a cooled, rotating roller or drum.
Since the melt is pulverised to small particles, it is cooled down within a short time, that is to say, at a high cooling rate. This leads to homogenous, spherically shaped particles.
The alloy is preferably pulverised in an atmosphere of protective gas, for example argon or nitrogen. However, it is also conceivable that pulverisation be carried out under normal atmospheric conditions. Alternatively, the melt can be pulverised in a vacuum. After the melt has been pulverised and cooled, an alloy in powdery form is obtained. The size of the powdery alloy particles can range from approximately 1 to 600 Nm.
In a subsequent step of the method, the powdery alloy is compacted and/or sintered. This is done by filling the powdery alloy into a mould and heating it. Once again, this can be carried out in a vacuum, a standard atmosphere or in a protective gas atmosphere. The powdery alloy is heated for compacting and/or sintering in such a way that the particles are only partially melted. Preferably, the particles of powdery alloy are only partially melted, specifically by heating them to a temperature slightly below their melting point. This enables the core of the powdery alloy particles to remain essentially solid. The surfaces of the powdery particles are heated evenly, preferably to a state in which peripheral areas of the powdery alloy are not quite liquid, but rather acquire a pasty consistency. This enables the particles to retain their shape and prevents peripheral areas of the powdery-alloy from separating from the core by dripping off. Another aspect is that, by heating the powdery alloy particles until their outer surfaces acquire a pasty consistency, the particles undergo negligible structural transformation and the chemical composition does not change. This is preferably achieved by keeping the temperature at which the particles are partly melted under the solidus point..
During compacting, the powdery particles of the alloy sinter below their melting point and congeal as a result. A compact, coherent and solid material is produced that qualifies as a sintered semi-finished product. The process of compacting or sintering may be carried out under pressurised or non-pressurised conditions.
The sintered semi-finished product has a size and weight that enables a dental technician to manipulate it in the same way as conventional semi-finished products made by smelting.
The semi-finished products sintered according to the method described in the foregoing may be worked up mechanically to prepare dental products, in particular implant abutments.
TIIG J~iii2r2u Sciiil-iiiilSilct~ piOG~iiCi Jiiau2 aCCOfdiri9 i0 the iilcti 0d ~2SCriu2d above is preferentially suitable as a material for dental casts. An appropriate amount of this casting material in semi-finished form is placed in the crucible of a conventional casting device. The sintered semi-finished product is melted in the crucible and the molten casting material is then poured in the usual manner from the crucible into the mould for the dental cast, which may be a crown, a bridge, an inlay, an onlay or a partial denture, whereby the preferable method is pressure or centrifugal casting.
Claims (13)
1. Method for producing a material for dental products, wherein particles of the material are at least partially melted or surface melted and these particles are compacted to form the material.
2. Method according to claim 1, characterised in that the molten or surface molten particles are compacted in such a way that they form sintered semi-finished products.
3. Method according to claim 1 or 2, characterised in that the particles are surface melted or partially melted from the outside, preferably only at the periphery.
4. Method according to any one of the preceding claims, characterised in that the particles are melted or surface melted in a flowing state, preferably during pulverisation.
5. Method according to any one of the preceding claims, characterised in that the particles are melted or surface melted in an evacuated vessel, in particular in a vacuum, or in that the melting or surface melting is performed in an atmosphere of protective gas.
6. Method according to any one of the preceding claims, characterised in that the melting or surface melting of the particles is performed below the melting point of the material constituting the particles.
7. Method according to any one of the preceding claims, characterised.
in that the molten or partially molten particles are compacted on a substrate, in particular in a mould.
in that the molten or partially molten particles are compacted on a substrate, in particular in a mould.
8. Method according to any one of the preceding claims, characterised in that the particles used are powdery starting materials of a dental alloy.
9. A method for preparing dental casts, wherein a casting material is melted in a melting crucible and the molten casting material is transferred from the melting crucible into a casting mould for the respective dental cast, characterised in that the casting material is sintered prior to melting.
10. Method according to any one of the preceding claims, characterised in that the casting material is formed of sintered particles of an alloy with a precious metal or non-precious metal basis, preferably on the basis of gold, palladium, platinum, silver, nickel-chromium, cobalt-chromium, iron andlor titanium.
11. Method according to any one of the preceding claims, characterised in that the size of the powdery alloy particles can range from 1 to 500 µm.
12. Use of a sintered alloy, in particular an alloy with a precious metal or non-precious metal base, as a casting material for dental casts, in particular crowns, bridges, inlays, onlays, partial dentures, superconstructions or pins for endodontics.
13. Use of a sintered alloy, in particular an alloy with a precious metal or non-precious metal base, as material for dental parts, preferably implant abutments.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19753706 | 1997-12-04 | ||
| DE19753706.5 | 1997-12-04 | ||
| DE19819715A DE19819715A1 (en) | 1997-12-04 | 1998-05-02 | Process for the production of dental castings and for the production of a material for dental products as well as uses thereof |
| DE19719715.2 | 1998-05-02 | ||
| PCT/EP1998/007849 WO1999029281A2 (en) | 1997-12-04 | 1998-12-03 | Method for producing dental castings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2279426A1 true CA2279426A1 (en) | 1999-06-17 |
Family
ID=26042149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002279426A Abandoned 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 |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0955989A2 (en) |
| JP (1) | JP2001510385A (en) |
| CA (1) | CA2279426A1 (en) |
| WO (1) | WO1999029281A2 (en) |
Cited By (1)
| 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 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6492513B2 (en) | 2014-10-09 | 2019-04-03 | セイコーエプソン株式会社 | Billet material for dental casting, metal powder for powder metallurgy, method for producing dental metal parts, and method for producing dental prosthesis |
| CN112853131B (en) * | 2020-12-30 | 2022-07-19 | 有研亿金新材料有限公司 | Preparation method of high-purity low-gas-content nickel-platinum alloy |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3359095A (en) * | 1964-02-19 | 1967-12-19 | Dow Chemical Co | Sintering of loose particulate aluminum metal |
| DE3531017A1 (en) * | 1985-08-30 | 1987-03-12 | Nowack Norbert Prof Dr Ing | Direct preparation of dental alloy castings from metal powder mixtures |
| 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/en active Pending
- 1998-12-03 EP EP98965746A patent/EP0955989A2/en not_active Withdrawn
- 1998-12-03 WO PCT/EP1998/007849 patent/WO1999029281A2/en not_active Application Discontinuation
Cited By (1)
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001510385A (en) | 2001-07-31 |
| EP0955989A2 (en) | 1999-11-17 |
| WO1999029281A2 (en) | 1999-06-17 |
| WO1999029281A3 (en) | 1999-09-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20030515 |