EP1330227A1 - High expansion dental alloys - Google Patents
High expansion dental alloysInfo
- Publication number
- EP1330227A1 EP1330227A1 EP01962024A EP01962024A EP1330227A1 EP 1330227 A1 EP1330227 A1 EP 1330227A1 EP 01962024 A EP01962024 A EP 01962024A EP 01962024 A EP01962024 A EP 01962024A EP 1330227 A1 EP1330227 A1 EP 1330227A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- cobalt
- chromium
- mixture
- alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000003564 dental alloy Substances 0.000 title claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 12
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 239000011651 chromium Substances 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 8
- 239000010941 cobalt Substances 0.000 claims abstract description 8
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 239000011572 manganese Substances 0.000 claims abstract description 7
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052737 gold Inorganic materials 0.000 claims abstract description 6
- 239000010931 gold Substances 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 5
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims abstract description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 5
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052796 boron Inorganic materials 0.000 claims abstract description 5
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 5
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 5
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052735 hafnium Inorganic materials 0.000 claims abstract description 5
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052738 indium Inorganic materials 0.000 claims abstract description 5
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 5
- 229910052718 tin Inorganic materials 0.000 claims abstract description 5
- 239000010936 titanium Substances 0.000 claims abstract description 5
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 5
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 5
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 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
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000010949 copper Substances 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 229910052741 iridium Inorganic materials 0.000 claims abstract description 4
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-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
- 229910052697 platinum Inorganic materials 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
- 229910052707 ruthenium Inorganic materials 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 239000010703 silicon Substances 0.000 claims abstract description 4
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 4
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 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
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 13
- WAIPAZQMEIHHTJ-UHFFFAOYSA-N [Cr].[Co] Chemical compound [Cr].[Co] WAIPAZQMEIHHTJ-UHFFFAOYSA-N 0.000 claims description 10
- 229910000684 Cobalt-chrome Inorganic materials 0.000 claims description 7
- 239000010952 cobalt-chrome Substances 0.000 claims description 7
- 229910052573 porcelain Inorganic materials 0.000 claims description 6
- 239000007943 implant Substances 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims 2
- 150000002910 rare earth metals Chemical class 0.000 claims 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 44
- 239000000956 alloy Substances 0.000 abstract description 44
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 239000000788 chromium alloy Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 150000002739 metals Chemical class 0.000 abstract description 5
- 239000011351 dental ceramic Substances 0.000 abstract description 2
- 239000002670 dental porcelain Substances 0.000 abstract description 2
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910000923 precious metal alloy Inorganic materials 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000002009 allergenic effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Definitions
- This invention relates to high expansion cobalt-chromium-based dental alloys.
- Gold-based alloys in dentistry were initially replaced by more economical palladium- based alloys. Recent increases in the price of palladium are making these alloys very expensive.
- Other economical alternatives have been nickel-based, cobalt- based and titanium- based systems.
- Nickel-based alloys allegedly have sensitivity and toxicity concerns. Titanium-based alloys are difficult to process and require special care and expensive equipment. These alloys, while being thermally compatible with conventional porcelains are not compatible with many high expansion porcelains available today.
- gold-based alloys are being marketed for use with high expansion porcelains, no economical alternatives exist.
- Metal free ceramic/composite systems and sintered or plated copings have also been used, but may lack the strength and other properties inherent in metals and alloys which render metals and alloys more desirable than their ceramic counterparts.
- the present invention provides chromium-cobalt alloys which are significantly different from chromium-cobalt alloys heretofore employed in the fabrication of prosthetic dental appliances.
- the alloys herein exhibit greatly improved oxidation resistance thereby facilitating the formation of a tenacious bond with high-expansion porcelain.
- the alloys herein comprise cobalt, chromium and manganese as essential components and include one or more of aluminum, indium, gallium, tin, and germanium, and may include one or more of iron, nickel, palladium and platinum.
- Optional components include gold, tantalum, niobium, molybdenum, tungsten, vanadium, iridium, ruthenium, rhenium, titanium, silicon, copper, zirconium, hafnium, boron, yttrium, and rare earths metals.
- the alloys herein are useful with high-expansion dental ceramics and porcelains, most preferably with those recently introduced to the market.
- the cobalt-chromium alloys of the present invention are especially suited for use in the fabrication of prosthetic dental appliances since the cobalt in the alloy imparts characteristics to the alloy which closely correspond to those of alloys having a high precious metal content. Cobalt is the major component, imparting to the alloy its inherent corrosion and tarnish resistance. The chromium in the alloy enhances this resistance. Chromium also acts as a solid solution strengthener and provides a convenient means of adjusting the thermal expansion characteristics of the alloy to conform to the variations encountered upon use of different commercial porcelains.
- the cobalt-chromium alloys of the present invention comprise the following ranges of components as set forth in Table 1 below, expressed as weight percent (Wt. %) of the total composition.
- manganese is an important component in the alloy because it is most effective in raising the coefficient of thermal expansion without embrittling the alloy, it acts as a desulfurizing agent and improves the castability of the alloy. It is preferable that manganese and aluminum are each present in an amount equal to or greater than about 2 weight percent. Aluminum also improves the oxidation resistance of the alloy.
- zirconium, hafnium, boron, yttrium, and rare earths metals may be added to the alloy to function to fill lattice discontinuities that may exist at grain boundaries and thereby increase structural perfection.
- the alloys of the present invention exhibit a melting range of from about 900 °C to about 1400 °C, and preferably from about 1000 °C to about 1380 °C and a coefficient of thermal expansion in the range of about 14.5 to about 19 x 10 "6 /°C at about room temperature to about 500°C, and more preferably about 15 to about 18 x 10 "6 /°C at about room temperature to about 500°C. It is important that the thermal expansion is slightly higher than that of the porcelains currently available, thereby placing the porcelain under compression and minimizing stress at the interface.
- the thermal expansion of the alloys herein indicate that the alloys are suitable for use with high-expansion porcelains (i.e., those having coefficients of thermal expansion of 14 to 18.5 x 10 "6 /°C at room temperature to 500°C), for example, high expansion porcelains such as OPC® Low WearTM porcelain (Jeneric®/Pentron® Incorporated) and Golden Gate porcelain (Ducera).
- high expansion porcelains such as OPC® Low WearTM porcelain (Jeneric®/Pentron® Incorporated) and Golden Gate porcelain (Ducera).
- the solidus temperature is preferably above about 800°C and the liquidus is below about 1500°C.
- the most preferred melting range is 1200-1350°C.
- the yield strength of the alloys herein is in excess of about 250 MPa; the tensile strength is in excess of about 400 MPa; and the elongation is in excess of about 3%.
- the Vickers Hardness of the alloy is no greater than about 400 HV 5 and preferably no greater than about 250 HV 5 . Lower hardness imparts working characteristics similar to white precious metal alloys. The tests performed on the alloys and the properties of the alloys follow guidelines as per ISO 9693.
- the alloys herein can be prepared by conventional alloying techniques. If desired, alloying can be effected in air, under vacuum or by employing a blanket of inert gas such as argon. The latter precautions, although preferred, are not considered essential. Generally, the major alloy constituents are melted first, such as through use of an induction furnace, taking care to maintain a homogeneous distribution of chromium in the melt by overcoming its tendency to float to the surface. After the cobalt and chromium have been melted and are well dispersed, the manganese can be added. Thereafter, the remaining alloy constituents can be added in either elemental form or as a preformed alloy with cobalt or chromium. Once the alloy melt is prepared and ingots cast therefrom, the remelting of the alloy ingot may be accomplished using a standard natural gas/oxygen torch or induction melting equipment.
- the alloys herein are useful in the manufacture of dental restoratives including, but limited to, crowns, bridges, space maintainers, tooth replacement appliances, orthodontic retainers, dentures, posts, jackets, inlays, onlays, facings, veneers, facets, implants, abutments, splints, partial crowns, teeth, cylinders, pins, and connectors.
- the alloys herein are used as the core material and may be veneered with ceramic or porcelain materials, such as high-expansion porcelains. While various descriptions of the present invention are described above, it should be understood that the various features can be used singly or in any combination thereof. Therefore, this invention is not to be limited to only the specifically preferred embodiments depicted herein.
Landscapes
- Dental Preparations (AREA)
Abstract
Chromium-cobalt alloys useful for use with high-expansion porcelains in the fabrication of prothetic dental appliances. The alloys herein comprise cobalt, chromium and manganese as essential components; and include one or more of aluminum, indium, gallium, tin and germanium; and may include one or more or iron, nickel, palladium and platinum. Optional components include gold, tantalum, niobium, molybdenum, tungsten, vanadium, iridium, ruthenium, rhenium, titanium, silicon, copper, zirconium, hafnium, boron, yttrium, and rare earths metals. The alloys herein are useful with high-expansion dental ceramics and porcelains.
Description
HIGH EXPANSION DENTAL ALLOYS
FIELD OF THE INVENTION
This invention relates to high expansion cobalt-chromium-based dental alloys.
BACKGROUND OF THE INVENTION
Gold-based alloys in dentistry were initially replaced by more economical palladium- based alloys. Recent increases in the price of palladium are making these alloys very expensive. Other economical alternatives have been nickel-based, cobalt- based and titanium- based systems. Nickel-based alloys allegedly have sensitivity and toxicity concerns. Titanium-based alloys are difficult to process and require special care and expensive equipment. These alloys, while being thermally compatible with conventional porcelains are not compatible with many high expansion porcelains available today. Although gold-based alloys are being marketed for use with high expansion porcelains, no economical alternatives exist. Metal free ceramic/composite systems and sintered or plated copings have also been used, but may lack the strength and other properties inherent in metals and alloys which render metals and alloys more desirable than their ceramic counterparts.
Thus, there is need for developing non-allergenic, cobalt-based alloys that exhibit many of the properties of precious metal alloys heretofore considered desirable in the fabrication of porcelain-veneered bridgework and crowns.
SUMMARY OF THE INVENTION
These and other objects and advantages are accomplished by the present invention which provides chromium-cobalt alloys which are significantly different from chromium-cobalt alloys heretofore employed in the fabrication of prosthetic dental appliances. The alloys herein exhibit greatly improved oxidation resistance thereby facilitating the formation of a tenacious bond with high-expansion porcelain.
The alloys herein comprise cobalt, chromium and manganese as essential components and include one or more of aluminum, indium, gallium, tin, and germanium, and may include one or more of iron, nickel, palladium and platinum. Optional components include gold, tantalum, niobium, molybdenum, tungsten, vanadium, iridium,
ruthenium, rhenium, titanium, silicon, copper, zirconium, hafnium, boron, yttrium, and rare earths metals. The alloys herein are useful with high-expansion dental ceramics and porcelains, most preferably with those recently introduced to the market.
DESCRIPTION OF THE INVENTION
The cobalt-chromium alloys of the present invention are especially suited for use in the fabrication of prosthetic dental appliances since the cobalt in the alloy imparts characteristics to the alloy which closely correspond to those of alloys having a high precious metal content. Cobalt is the major component, imparting to the alloy its inherent corrosion and tarnish resistance. The chromium in the alloy enhances this resistance. Chromium also acts as a solid solution strengthener and provides a convenient means of adjusting the thermal expansion characteristics of the alloy to conform to the variations encountered upon use of different commercial porcelains. The cobalt-chromium alloys of the present invention comprise the following ranges of components as set forth in Table 1 below, expressed as weight percent (Wt. %) of the total composition.
Table 1
The addition of one or more of manganese, aluminum, indium, gallium, tin, or germanium has been found to increase the coefficient of thermal expansion and lower the melting temperature of the alloy. Manganese is an important component in the alloy because it is most effective in raising the coefficient of thermal expansion without embrittling the alloy, it acts as a desulfurizing agent and improves the castability of the alloy. It is preferable that manganese and aluminum are each present in an amount equal to or greater than about 2 weight percent. Aluminum also improves the oxidation resistance of the alloy.
It has been found that one or more of zirconium, hafnium, boron, yttrium, and rare earths metals may be added to the alloy to function to fill lattice discontinuities that may exist at grain boundaries and thereby increase structural perfection.
The following examples in Table 2 further illustrate the criticalities of the alloy composition of the present invention. All percentages and parts are by weight.
Table 2
The thermal expansion properties of the alloys of Table 2 are provided in Table 3 below along with mechanical and other properties for alloys 2 and 7.
Table 3
The alloys of the present invention exhibit a melting range of from about 900 °C to about 1400 °C, and preferably from about 1000 °C to about 1380 °C and a coefficient of thermal expansion in the range of about 14.5 to about 19 x 10"6/°C at about room temperature to about 500°C, and more preferably about 15 to about 18 x 10"6/°C at about room temperature to about 500°C. It is important that the thermal expansion is slightly higher than that of the porcelains currently available, thereby placing the porcelain under compression and minimizing stress at the interface. The thermal expansion of the alloys herein indicate that the alloys are suitable for use with high-expansion porcelains (i.e., those having coefficients of thermal expansion of 14 to 18.5 x 10"6/°C at room temperature to 500°C), for example, high expansion porcelains such as OPC® Low Wear™ porcelain (Jeneric®/Pentron® Incorporated) and Golden Gate porcelain (Ducera). The solidus temperature is preferably above about 800°C and the liquidus is below about 1500°C. The most preferred melting range is 1200-1350°C.
The yield strength of the alloys herein is in excess of about 250 MPa; the tensile strength is in excess of about 400 MPa; and the elongation is in excess of about 3%. The Vickers Hardness of the alloy is no greater than about 400 HV5 and preferably no greater than about 250 HV5. Lower hardness imparts working characteristics similar to white precious metal alloys. The tests performed on the alloys and the properties of the alloys follow guidelines as per ISO 9693.
The alloys herein can be prepared by conventional alloying techniques. If desired, alloying can be effected in air, under vacuum or by employing a blanket of inert gas such as argon. The latter precautions, although preferred, are not considered essential. Generally, the major alloy constituents are melted first, such as through use of an induction furnace, taking care to maintain a homogeneous distribution of chromium in the melt by overcoming its tendency to float to the surface. After the cobalt and chromium have been melted and are well dispersed, the manganese can be added. Thereafter, the remaining alloy constituents can be added in either elemental form or as a preformed alloy with cobalt or chromium. Once the alloy melt is prepared and ingots cast therefrom, the remelting of the alloy ingot may be accomplished using a standard natural gas/oxygen torch or induction melting equipment.
The alloys herein are useful in the manufacture of dental restoratives including, but limited to, crowns, bridges, space maintainers, tooth replacement appliances, orthodontic retainers, dentures, posts, jackets, inlays, onlays, facings, veneers, facets, implants, abutments, splints, partial crowns, teeth, cylinders, pins, and connectors. Preferably the alloys herein are used as the core material and may be veneered with ceramic or porcelain materials, such as high-expansion porcelains. While various descriptions of the present invention are described above, it should be understood that the various features can be used singly or in any combination thereof. Therefore, this invention is not to be limited to only the specifically preferred embodiments depicted herein.
Further, it should be understood that variations and modifications within the spirit and scope of the invention may occur to those skilled in the art to which the invention pertains. Accordingly, all expedient modifications readily attainable by one versed in the art from the disclosure set forth herein that are within the scope and spirit of the present invention are to be included as further embodiments of the present invention. The scope of the present invention is accordingly defined as set forth in the appended claims.
Claims
1. A cobalt-chromium dental alloy comprising based on the weight of the total composition 60 to 85 weight %cobalt;
15 to 30 weight % chromium;
1 to 20 weight % iron, nickel, palladium, or platinum, or mixture thereof;
2-20 weight % manganese0/-; and
1 to 15 weight % aluminum, indium, gallium, tin, or germanium, or mixture thereof.
2. The cobalt-chromium dental alloy of claim 1 comprising: 65 to 80 weight % cobalt;
18 to 25 weight % chromium; 2 to 10 weight % iron, nickel, palladium, or platinum, or mixture thereof;
2 to 10 weight % manganese;
1 to 7 weight % aluminum, indium, gallium, tin, or germanium, or mixture thereof
1 to 5 weight % gold; and 0J to 3 weight % iridium, ruthenium, rhenium, titanium, silicon, or copper, or mixture thereof.
3. The cobalt-chromium alloy of claims 1 or 2 wherein aluminum is present in an amount of at least 2 weight %.
4. The cobalt-chromium dental alloy of claim 1 further comprising: up to 10 weight % gold; up to 15 weight % tantalum, niobium, molybdenum, tungsten, or vanadium or mixture thereof; up to 6 weight % iridium, ruthenium, rhenium, titanium, silicon, or copper or mixture thereof; and up to 5 weight % zirconium, hafnium, boron, yttrium, or a rare earth metal or mixture thereof.
5. The cobalt-chromium dental alloy of claims 1 or 2 having a coefficient of thermal expansion from 15 to 18 x 10"6/°C at room temperature to 500°C.
6. The cobalt-chromium dental alloy of claims 1 or 2 having a Vickers Hardness of no greater than 300 HV5.
7. A dental restoration comprising the cobalt-chromium alloy of claims 1 or 2.
8. The dental restoration of claim 7 further comprising a high-expansion porcelain on the cobalt-chromium alloy.
9. The dental restoration of claim 7 wherein the dental restoration comprises a crown, bridge, space maintainer, tooth replacement appliance, orthodontic retainer, denture, post, jacket, inlay, onlay, facing, veneer, facet, implant, abutment, splint, partial crown, teeth, cylinder, pin, connector or combination thereof.
10. The cobalt-chromium dental alloy of claims 1 or 2 further comprising: up to 5 weight % tantalum, niobium, molybdenum, tungsten, or vanadium, or mixture thereof; and up to 1 weight % zirconium, hafnium, boron, yttrium, or a rare earth metal, or mixture thereof.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24430600P | 2000-08-10 | 2000-08-10 | |
| US244306P | 2000-10-31 | ||
| US27553901P | 2001-03-13 | 2001-03-13 | |
| US275539P | 2001-03-31 | ||
| PCT/US2001/025018 WO2002036080A1 (en) | 2000-08-10 | 2001-08-10 | High expansion dental alloys |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1330227A1 true EP1330227A1 (en) | 2003-07-30 |
Family
ID=26936457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01962024A Withdrawn EP1330227A1 (en) | 2000-08-10 | 2001-08-10 | High expansion dental alloys |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP1330227A1 (en) |
-
2001
- 2001-08-10 EP EP01962024A patent/EP1330227A1/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0236080A1 * |
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