CA2152155C - Dental alloy of high gold content - Google Patents
Dental alloy of high gold content Download PDFInfo
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- CA2152155C CA2152155C CA002152155A CA2152155A CA2152155C CA 2152155 C CA2152155 C CA 2152155C CA 002152155 A CA002152155 A CA 002152155A CA 2152155 A CA2152155 A CA 2152155A CA 2152155 C CA2152155 C CA 2152155C
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- titanium
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000010931 gold Substances 0.000 title claims abstract description 29
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 29
- 239000003564 dental alloy Substances 0.000 title claims abstract description 16
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 18
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 16
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000010936 titanium Substances 0.000 claims abstract description 11
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 8
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 8
- 229910052741 iridium Inorganic materials 0.000 claims abstract description 7
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052709 silver Inorganic materials 0.000 claims abstract description 7
- 239000004332 silver Substances 0.000 claims abstract description 7
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 6
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims abstract description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 4
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 239000011733 molybdenum Substances 0.000 claims abstract description 4
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 4
- 239000010955 niobium Substances 0.000 claims abstract description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052762 osmium Inorganic materials 0.000 claims abstract description 4
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052702 rhenium Inorganic materials 0.000 claims abstract description 4
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052703 rhodium Inorganic materials 0.000 claims abstract description 4
- 239000010948 rhodium Substances 0.000 claims abstract description 4
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052707 ruthenium Inorganic materials 0.000 claims abstract description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 4
- 239000010937 tungsten Substances 0.000 claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 7
- 238000007796 conventional method Methods 0.000 abstract description 2
- 229910001020 Au alloy Inorganic materials 0.000 abstract 1
- 239000003353 gold alloy Substances 0.000 abstract 1
- 239000000956 alloy Substances 0.000 description 41
- 229910045601 alloy Inorganic materials 0.000 description 41
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 229910000510 noble metal Inorganic materials 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 206010020751 Hypersensitivity Diseases 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 3
- 238000007792 addition Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052738 indium Inorganic materials 0.000 description 3
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- FFRBMBIXVSCUFS-UHFFFAOYSA-N 2,4-dinitro-1-naphthol Chemical compound C1=CC=C2C(O)=C([N+]([O-])=O)C=C([N+]([O-])=O)C2=C1 FFRBMBIXVSCUFS-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229910018883 Pt—Cu Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 231100001010 corrosive Toxicity 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 239000011351 dental ceramic Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001575 pathological effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 210000003296 saliva Anatomy 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/02—Alloys based on gold
-
- 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
Landscapes
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Plastic & Reconstructive Surgery (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Engineering & Computer Science (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Dental Preparations (AREA)
Abstract
The new dental alloy of high gold content which is particularly suited for facing with ceramic consists of from 91 to 99.4 % of gold, from 0.5 to 3 % of titanium and/or tantalum, from 0 to 5 % of silver and from 0 to 1 % of at least one of iridium, rhodium, ruthenium, platinum, palladium, osmium, tungsten, iron, molybdenum, niobium and rhenium, the percentages indicated being by weight.
This dental alloy is extremely biologically compatible and can be used in the conventional technique and in the burning-on technique as well so that it may be employed as a universal gold alloy which fulfils the standards ISO 1562 and ISO 9693 and, respectively, DIN 13927.
This dental alloy is extremely biologically compatible and can be used in the conventional technique and in the burning-on technique as well so that it may be employed as a universal gold alloy which fulfils the standards ISO 1562 and ISO 9693 and, respectively, DIN 13927.
Description
Dental alloy of high gold content Background of the Invention The present invention belongs to the field of dental art and is related to a new and useful dental alloy having a high gold content and a golden yellow colour, and which is destined and appropriate for the facing with commercially available dental ceramic com-pounds and for the manufacture of dental prosthesis parts as well which remain unfaced or are to be faced with synthetic or other materials.
Noble metal dental alloys having a high gold con-tent are widely spread for the use in metallic, solid-ly fastened dentures such as crowns, bridges etc., in-ter alia because of their good biological compatibili-ty and high corrosion resistance in the mouth milieu.
Furthermore, they are technically easy to process.
Silver and copper containing gold casting alloys are successfully used since a long time in restorative dentistry. In the conventional alloys, the high mecha-nical resistance required for these materials when un-faced parts or parts to be faced with synthetic mate-rials are to be made, is adjusted through the silver to copper ratio.
In view of optimal aesthetics of solidly fastened dental reconstructions, especially in the visible re-gion, an at least partial facing of a metallic base by a ceramic compound has proven to be particularly ap-propriate since the advantages of the ceramics, namely hardness, aesthetics and outstanding biological compa-T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95) _2152155 tibility, can optimally be combined in this material composite with the advantages of the metallic materi-al, namely tensile strength and better precision of fit.
The use of a ceramic facing requires special pro-perties of the alloy. Thus, the melting interval of the alloy should markedly be higher than the baking temperature of the ceramics which is about 980 °C, and the alloy must furthermore present a sufficient burn-ing stability so that the metallic base to be faced remains dimensionally stable during the burning or baking operation.
In order to guarantee a durable adhesion between alloy and ceramics, no tensile stress should build up during the manufacture process. This is achieved, in an already known manner, by selecting the thermal ex-pansion coefficient of the alloy slightly higher than that of the ceramics. During the cooling process, a compressive strain is produced in the ceramic coating due to the somewhat higher shrinking alloy.
The requirements cited above have resulted in the development of special alloys called burn-on alloys which form an own class besides the conventional gold casting alloys and which are standardized by the stan-dards ISO 9693 and DIN 13927.
In order to achieve the above discussed required properties of burn-on alloys, the elements platinum and/or palladium have been added by alloying to the alloys for metal-ceramic on the base of gold. Fur-thermore, other metals than noble ones are added by T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95) _2152155 alloying in order to improve the strength of the al-loy, such as copper, indium, gallium, tin and/or zinc.
The alloy strength could basically be improved by add-ing higher proportions of silver and copper; however, this possibility cannot be used because of undesired reactions of such alloys with the ceramic and of a too high oxidation of the alloy.
In particular, additions of palladium, but also of platinum lead to a sensible reduction of the de-sired yellow colour of the alloy which is felt by the patient as aesthetically agreeable and desirable.
Recently, some non-noble metals used in the noble metal alloys have been suspected to cause troubles and pathological reactions in some patients. Reference is especially made to indium which is contained in nearly all burn-on alloys; see the article of J. Wirz: "Scha-digung des Paradontes durch zahnarztliche Werkstoffe"
(Damage of the paradontium by dentistry materials), zahnarztliche Welt 102, 146 (1993). Palladium too is suspected to provoke toxic or allergic reactions if it is contained in higher proportions in the noble metal alloy and is therefore able to be liberated by corro-sion. Furthermore, the need for a universally applic-able dental alloy becomes more and more relevant, i.e.
an alloy which is suitable both for conventional den-tal prostheses which remain unfaced or are faced with synthetic material, respectively, and for the techni-que of metal-ceramic. Such alloys have the advantage of excluding the danger of forming a galvanic element due to the use of different alloys in the mouth cavi-ty, accompanied by corrosion processes. Recently, such universal alloys are promoted which, however, are T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95) on the base of Au-Ag-Pt-Cu with the addition of the non-noble metals indium and zinc. These alloys pre-sent the shortcomings that they are relatively suscep-tible to corrosion, in particular due to the surface oxides formed during burning which are not necessarily covered by ceramic in the region of the crown edges and are therefore accessible to saliva and its corro-sive action. Furthermore, a special, low melting ce-ramic is required for this alloy and which, dependent on the manufacturing method, presents a higher corro-sion rate than the known higher melting facing cera-mics.
In addition,, alloys of high gold content gene-rally present a bad high temperature creeping resis-tance so that metallic, long span bridge structures are generally deformed during the burning process and loose their fitting precision. Therefore, long brid-ges that are to be faced with ceramic must be made from alloys having a higher palladium content, but they do no longer have the desired old gold colour appreciated by the patient, and they present the biological drawbacks mentioned above.
On the other hand, the non-noble metals titanium and tantalum have proven to be strongly biologically compatible materials in dentistry. For example, im-plants of titanium will heal in the bone without any defense reaction due to the superficial formation of titanium oxide which is very corrosion resistant and inert, and allergic reactions on this material are occurring extremely seldom, if at all. Therefore, these metals are to be considered from a clinical and T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95) _2152155 biological sight as ideal alloy partners for gold which is known to be extremely corrosion stable too.
Titanium containing dental alloys of high gold content which are suited for the facing with ceramics have already become known from the patent literature.
DE-A-2,302,837 discloses a titanium alloy of high gold content which further contains a relative high propor-tion of platinum or a metal of the platinum group as well as palladium which may provoke, as already des-cribed above, allergic reactions. Furthermore, the succeeding application published under DE-A-2,357,552 describes a titanium alloy of high gold content which also contains an element of the platinum group, but no quantitative indications can be found.
In addition, titanium alloys of high gold content for the use in jewelry have become known, for example from EP-A-0,190,648. These ornamental alloys must respond to other criteria than those of dental alloys, and compositions of ornamental alloys that are dis-closed cannot be transferred automatically, see above, to dental alloys.
Summarv of the Invention Based upon this prior art, it is a first and ma-jor object of the present invention to provide new and useful dental alloys which not only present an out-standing biological compatibility but also can be used in a universal manner.
Noble metal dental alloys having a high gold con-tent are widely spread for the use in metallic, solid-ly fastened dentures such as crowns, bridges etc., in-ter alia because of their good biological compatibili-ty and high corrosion resistance in the mouth milieu.
Furthermore, they are technically easy to process.
Silver and copper containing gold casting alloys are successfully used since a long time in restorative dentistry. In the conventional alloys, the high mecha-nical resistance required for these materials when un-faced parts or parts to be faced with synthetic mate-rials are to be made, is adjusted through the silver to copper ratio.
In view of optimal aesthetics of solidly fastened dental reconstructions, especially in the visible re-gion, an at least partial facing of a metallic base by a ceramic compound has proven to be particularly ap-propriate since the advantages of the ceramics, namely hardness, aesthetics and outstanding biological compa-T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95) _2152155 tibility, can optimally be combined in this material composite with the advantages of the metallic materi-al, namely tensile strength and better precision of fit.
The use of a ceramic facing requires special pro-perties of the alloy. Thus, the melting interval of the alloy should markedly be higher than the baking temperature of the ceramics which is about 980 °C, and the alloy must furthermore present a sufficient burn-ing stability so that the metallic base to be faced remains dimensionally stable during the burning or baking operation.
In order to guarantee a durable adhesion between alloy and ceramics, no tensile stress should build up during the manufacture process. This is achieved, in an already known manner, by selecting the thermal ex-pansion coefficient of the alloy slightly higher than that of the ceramics. During the cooling process, a compressive strain is produced in the ceramic coating due to the somewhat higher shrinking alloy.
The requirements cited above have resulted in the development of special alloys called burn-on alloys which form an own class besides the conventional gold casting alloys and which are standardized by the stan-dards ISO 9693 and DIN 13927.
In order to achieve the above discussed required properties of burn-on alloys, the elements platinum and/or palladium have been added by alloying to the alloys for metal-ceramic on the base of gold. Fur-thermore, other metals than noble ones are added by T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95) _2152155 alloying in order to improve the strength of the al-loy, such as copper, indium, gallium, tin and/or zinc.
The alloy strength could basically be improved by add-ing higher proportions of silver and copper; however, this possibility cannot be used because of undesired reactions of such alloys with the ceramic and of a too high oxidation of the alloy.
In particular, additions of palladium, but also of platinum lead to a sensible reduction of the de-sired yellow colour of the alloy which is felt by the patient as aesthetically agreeable and desirable.
Recently, some non-noble metals used in the noble metal alloys have been suspected to cause troubles and pathological reactions in some patients. Reference is especially made to indium which is contained in nearly all burn-on alloys; see the article of J. Wirz: "Scha-digung des Paradontes durch zahnarztliche Werkstoffe"
(Damage of the paradontium by dentistry materials), zahnarztliche Welt 102, 146 (1993). Palladium too is suspected to provoke toxic or allergic reactions if it is contained in higher proportions in the noble metal alloy and is therefore able to be liberated by corro-sion. Furthermore, the need for a universally applic-able dental alloy becomes more and more relevant, i.e.
an alloy which is suitable both for conventional den-tal prostheses which remain unfaced or are faced with synthetic material, respectively, and for the techni-que of metal-ceramic. Such alloys have the advantage of excluding the danger of forming a galvanic element due to the use of different alloys in the mouth cavi-ty, accompanied by corrosion processes. Recently, such universal alloys are promoted which, however, are T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95) on the base of Au-Ag-Pt-Cu with the addition of the non-noble metals indium and zinc. These alloys pre-sent the shortcomings that they are relatively suscep-tible to corrosion, in particular due to the surface oxides formed during burning which are not necessarily covered by ceramic in the region of the crown edges and are therefore accessible to saliva and its corro-sive action. Furthermore, a special, low melting ce-ramic is required for this alloy and which, dependent on the manufacturing method, presents a higher corro-sion rate than the known higher melting facing cera-mics.
In addition,, alloys of high gold content gene-rally present a bad high temperature creeping resis-tance so that metallic, long span bridge structures are generally deformed during the burning process and loose their fitting precision. Therefore, long brid-ges that are to be faced with ceramic must be made from alloys having a higher palladium content, but they do no longer have the desired old gold colour appreciated by the patient, and they present the biological drawbacks mentioned above.
On the other hand, the non-noble metals titanium and tantalum have proven to be strongly biologically compatible materials in dentistry. For example, im-plants of titanium will heal in the bone without any defense reaction due to the superficial formation of titanium oxide which is very corrosion resistant and inert, and allergic reactions on this material are occurring extremely seldom, if at all. Therefore, these metals are to be considered from a clinical and T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95) _2152155 biological sight as ideal alloy partners for gold which is known to be extremely corrosion stable too.
Titanium containing dental alloys of high gold content which are suited for the facing with ceramics have already become known from the patent literature.
DE-A-2,302,837 discloses a titanium alloy of high gold content which further contains a relative high propor-tion of platinum or a metal of the platinum group as well as palladium which may provoke, as already des-cribed above, allergic reactions. Furthermore, the succeeding application published under DE-A-2,357,552 describes a titanium alloy of high gold content which also contains an element of the platinum group, but no quantitative indications can be found.
In addition, titanium alloys of high gold content for the use in jewelry have become known, for example from EP-A-0,190,648. These ornamental alloys must respond to other criteria than those of dental alloys, and compositions of ornamental alloys that are dis-closed cannot be transferred automatically, see above, to dental alloys.
Summarv of the Invention Based upon this prior art, it is a first and ma-jor object of the present invention to provide new and useful dental alloys which not only present an out-standing biological compatibility but also can be used in a universal manner.
T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95) There is another object of the invention to pro-vide dental alloys which fulfil the standards ISO 1562 and ISO 9693 as well as DIN 13927.
A further object of the invention is to provide dental alloys having a high gold content which pre-sent, in spite of other metals alloyed thereto, the pleasant and most desired yellow colour of genuine gold.
All these objects are attained by the high gold content dental alloys of the invention which comprise, on a weight basis, 91 to 99.4 % of gold, 0.5 to 3 % of at least one metal selected from titanium and tanta-lum, 0 to 5 % of silver, and 0 to 1 % of at least one element selected from the group comprising iridium, rhodium, ruthenium, platinum, osmium, tungsten, iron, molybdenum, niobium and rhenium.
An alloy which is particularly suited for the intended purposes of this invention comprises 97.5 to 98.5 % of gold, 1.4 to 2.4 % of titanium and 0.05 to 0.15 % of iridium.
Detailed Description of the Invention Tests have shown that an alloy composed of 91 to 99.4 % of gold, 0.5 to 3 % of titanium and/or tanta-lum, 0 to 5 % of silver and 0 to 1 % of iridium, rho-dium, ruthenium, platinum, palladium, osmium, tung-sten, iron, molybdenum, niobium and/or rhenium, sur-prisingly presents universal properties and can there-fore also be used in conventional techniques; the al-loy fulfils the requirements of the standards ISO 1652 T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95) _2152155 and ISO 9693 and of DIN 13927 as well. Since gold as well as titanium are extremely biologically compati-ble, an alloy of these two components is extremely biologically compatible too and is furthermore very attractive from an aesthetical viewpoint since the titanium or the tantalum, respectively, do not sen sibly influence the golden colour. Furthermore, this alloy only contains a very small proportion of non noble metals so that it does not loose its corrosion stability.
Furthermore, it has surprisingly been found that alloys having the mentioned composition display a very good high temperature creeping stability. For exam-ple, an alloy having the following composition: 97.5 to 98.5 % of gold, 1.4 to 2.4 % of titanium, and 0.05 to 0.15 % of iridium has a high temperature creeping stability better than all of the noble metal casting alloys used so far in the dental field. For the first time, this alloys allow without problems to face long metallic bridge structures, produced by casting from a golden yellow alloy of a high gold content, with cera-mics. It could be shown that on the addition of more than 1 % of platinum to this alloy, as it has for example been described in DE-A-2,302,837, the high temperature creeping resistance is markedly reduced.
_ 7 T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95)
A further object of the invention is to provide dental alloys having a high gold content which pre-sent, in spite of other metals alloyed thereto, the pleasant and most desired yellow colour of genuine gold.
All these objects are attained by the high gold content dental alloys of the invention which comprise, on a weight basis, 91 to 99.4 % of gold, 0.5 to 3 % of at least one metal selected from titanium and tanta-lum, 0 to 5 % of silver, and 0 to 1 % of at least one element selected from the group comprising iridium, rhodium, ruthenium, platinum, osmium, tungsten, iron, molybdenum, niobium and rhenium.
An alloy which is particularly suited for the intended purposes of this invention comprises 97.5 to 98.5 % of gold, 1.4 to 2.4 % of titanium and 0.05 to 0.15 % of iridium.
Detailed Description of the Invention Tests have shown that an alloy composed of 91 to 99.4 % of gold, 0.5 to 3 % of titanium and/or tanta-lum, 0 to 5 % of silver and 0 to 1 % of iridium, rho-dium, ruthenium, platinum, palladium, osmium, tung-sten, iron, molybdenum, niobium and/or rhenium, sur-prisingly presents universal properties and can there-fore also be used in conventional techniques; the al-loy fulfils the requirements of the standards ISO 1652 T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95) _2152155 and ISO 9693 and of DIN 13927 as well. Since gold as well as titanium are extremely biologically compati-ble, an alloy of these two components is extremely biologically compatible too and is furthermore very attractive from an aesthetical viewpoint since the titanium or the tantalum, respectively, do not sen sibly influence the golden colour. Furthermore, this alloy only contains a very small proportion of non noble metals so that it does not loose its corrosion stability.
Furthermore, it has surprisingly been found that alloys having the mentioned composition display a very good high temperature creeping stability. For exam-ple, an alloy having the following composition: 97.5 to 98.5 % of gold, 1.4 to 2.4 % of titanium, and 0.05 to 0.15 % of iridium has a high temperature creeping stability better than all of the noble metal casting alloys used so far in the dental field. For the first time, this alloys allow without problems to face long metallic bridge structures, produced by casting from a golden yellow alloy of a high gold content, with cera-mics. It could be shown that on the addition of more than 1 % of platinum to this alloy, as it has for example been described in DE-A-2,302,837, the high temperature creeping resistance is markedly reduced.
_ 7 T:\KG\TEXTE\UEBERSET\25448E.SE(ST/DM/s 01.06.95)
Claims (2)
1. A dental alloy of high gold content, charac-terized that it consists of from 91 to 99.4 % of gold, from 0.5 to 3 % of at least one metal selected from titanium and tantalum, from 0 to 5 % of silver, from 0 to 1 % of at least one metal selected from iridium, rhodium, ruthenium, platinum, palladium, osmium, tung-sten, iron, molybdenum, niobium and rhenium, the per-centages given being by weight.
2. The dental alloy of high gold content accord-ing to claim 1, characterized in that it consists of from 97.5 to 98.5 % of gold, from 1.4 to 2.4 % of ti-tanium, and from 0.05 to 0.15 % of iridium.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP94810394A EP0691123B2 (en) | 1994-07-05 | 1994-07-05 | Dental alloy with a high gold content |
| EP94810394.0 | 1994-07-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2152155A1 CA2152155A1 (en) | 1996-01-06 |
| CA2152155C true CA2152155C (en) | 2005-08-09 |
Family
ID=8218281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002152155A Expired - Fee Related CA2152155C (en) | 1994-07-05 | 1995-06-19 | Dental alloy of high gold content |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0691123B2 (en) |
| JP (1) | JPH0867931A (en) |
| KR (1) | KR100335517B1 (en) |
| CA (1) | CA2152155C (en) |
| DE (1) | DE59404640D1 (en) |
| DK (1) | DK0691123T4 (en) |
| ES (1) | ES2110725T5 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4439793C2 (en) * | 1994-11-08 | 2001-05-23 | Degussa | Process for the production of moldings from gold-titanium alloys |
| DE19506681C1 (en) * | 1995-02-25 | 1996-10-02 | Degussa | Castable construction elements for dental technology |
| DK0729740T3 (en) * | 1995-02-25 | 2004-07-26 | Degudent Gmbh | Application of gold alloys to structural elements in dental engineering |
| DE19604827C2 (en) * | 1995-02-25 | 1997-03-06 | Degussa | Use of gold alloys for construction elements in dental technology |
| KR20040047143A (en) * | 2002-11-29 | 2004-06-05 | 주식회사 케이디엠 | Dental Precious Alloy for Metal-Ceramic Crown and Method of Making the Same |
| KR20040047148A (en) * | 2002-11-29 | 2004-06-05 | 주식회사 케이디엠 | Dental Precious Alloy and Method of Making the Same |
| US7279054B2 (en) | 2004-05-14 | 2007-10-09 | The Argen Corporation | Dental prosthesis method and alloys |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2302837C3 (en) * | 1973-01-20 | 1975-09-11 | Dr. Th. Wieland Scheideanstalt, 7530 Pforzheim | Dental gold alloy |
| DE2357552A1 (en) * | 1973-11-17 | 1975-05-22 | Wieland Fa Dr Th | GOLD ALLOY FOR BURNING ON PORCELAIN FOR DENTAL PURPOSES |
| DE2424575C3 (en) * | 1974-05-21 | 1979-08-30 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt | Gold alloy for firing porcelain for dental purposes |
| DE2828304C2 (en) † | 1978-06-28 | 1979-09-27 | Fa. Dr. Th. Wieland, 7530 Pforzheim | Dental precious metal alloy for firing porcelain |
| US4606981A (en) * | 1982-12-02 | 1986-08-19 | Gte Products Corporation | Ductile brazing alloys containing reactive metals |
| NL9200564A (en) * | 1992-03-26 | 1993-10-18 | Elephant Edelmetaal Bv | Dental alloy and dental porcelain for dental purposes. |
| DE4419408C1 (en) † | 1994-06-03 | 1995-07-06 | Wieland Edelmetalle | Gold@ dental alloy contg. titanium and other named hypoallergenic additives |
-
1994
- 1994-07-05 DK DK94810394T patent/DK0691123T4/en active
- 1994-07-05 EP EP94810394A patent/EP0691123B2/en not_active Expired - Lifetime
- 1994-07-05 DE DE59404640T patent/DE59404640D1/en not_active Expired - Fee Related
- 1994-07-05 ES ES94810394T patent/ES2110725T5/en not_active Expired - Lifetime
-
1995
- 1995-06-19 CA CA002152155A patent/CA2152155C/en not_active Expired - Fee Related
- 1995-06-29 KR KR1019950018025A patent/KR100335517B1/en not_active Expired - Fee Related
- 1995-07-04 JP JP7168941A patent/JPH0867931A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| ES2110725T3 (en) | 1998-02-16 |
| CA2152155A1 (en) | 1996-01-06 |
| JPH0867931A (en) | 1996-03-12 |
| KR100335517B1 (en) | 2002-09-04 |
| DE59404640D1 (en) | 1998-01-02 |
| DK0691123T4 (en) | 2001-12-10 |
| KR960003703A (en) | 1996-02-23 |
| EP0691123B2 (en) | 2001-09-26 |
| DK0691123T3 (en) | 1998-03-02 |
| EP0691123A1 (en) | 1996-01-10 |
| EP0691123B1 (en) | 1997-11-19 |
| ES2110725T5 (en) | 2002-02-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20090619 |