EP1330227A1 - Dentallegierungen mit hohem expandiervermögen - Google Patents

Dentallegierungen mit hohem expandiervermögen

Info

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Withdrawn
Application number
EP01962024A
Other languages
English (en)
French (fr)
Inventor
Arun Prasad
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PENTRON ALLOYS LLC
Original Assignee
Jeneric Pentron Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jeneric Pentron Inc filed Critical Jeneric Pentron Inc
Priority claimed from PCT/US2001/025018 external-priority patent/WO2002036080A1/en
Publication of EP1330227A1 publication Critical patent/EP1330227A1/de
Withdrawn legal-status Critical Current

Links

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)
EP01962024A 2000-08-10 2001-08-10 Dentallegierungen mit hohem expandiervermögen Withdrawn EP1330227A1 (de)

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 (de) 2003-07-30

Family

ID=26936457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01962024A Withdrawn EP1330227A1 (de) 2000-08-10 2001-08-10 Dentallegierungen mit hohem expandiervermögen

Country Status (1)

Country Link
EP (1) EP1330227A1 (de)

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0236080A1 *

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 20020318

AK Designated contracting states

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

RBV Designated contracting states (corrected)

Designated state(s): CH DE FR LI

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: PENTRON ALLOYS, LLC

17Q First examination report despatched

Effective date: 20050914

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Effective date: 20080223