Process for the preparation of coloured blanks and dental shaped parts

• US 8,541,329 B2
• Filed: 09/02/2011
• Issued: 09/24/2013
• Est. Priority Date: 05/23/2006
• Status: Active Grant

• Current Assignee: Ivoclar Vivadent AG
• Original Assignee: Ivoclar Vivadent AG
• Inventors: Ritzberger, Christian, Apel, Elke, Hland, Wolfram, Rothbrust, Frank, Kerschbaumer, Harald, Rheinberger, Volker
• Primary Examiner(s): Olsen, Kaj
• Assistant Examiner(s): WIESE, NOAH S
• Application Number:
  US13/224,492
• Publication Number:
  US 20110319254A1
• Time in Patent Office: 753 Days
• Field of Search: 501/102, 501/103, 501/104, 501/105, 501/126, 501/127, 501/128, 501/129, 501/130, 501/131, 501/132, 106/35
• US Class Current: 501/103
• CPC Class Codes: A61C 13/0022 Blanks or green, unfinished dental restoration parts
• CPC Class Codes: A61C 5/77 Methods or devices for making crowns
• CPC Class Codes: A61K 6/804 comprising manganese oxide
• CPC Class Codes: A61K 6/813 comprising iron oxide
• CPC Class Codes: A61K 6/818 comprising zirconium oxide
• CPC Class Codes: A61K 6/822 comprising rare earth metal oxides
• CPC Class Codes: A61K 6/833 Glass-ceramic composites
• CPC Class Codes: C04B 2235/3217 Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
• CPC Class Codes: C04B 2235/3224 Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
• CPC Class Codes: C04B 2235/3225 Yttrium oxide or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3241 Chromium oxides, chromates, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3244 Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3246 Stabilised zirconias, e.g. YSZ or cerium stabilised zirconia
• CPC Class Codes: C04B 2235/3262 Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
• CPC Class Codes: C04B 2235/3265 Mn2O3
• CPC Class Codes: C04B 2235/3272 Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
• CPC Class Codes: C04B 2235/443 Nitrates or nitrites
• CPC Class Codes: C04B 2235/444 Halide containing anions, e.g. bromide, iodate, chlorite
• CPC Class Codes: C04B 2235/5409 expressed by specific surface values
• CPC Class Codes: C04B 2235/6026 Computer aided shaping, e.g. rapid prototyping
• CPC Class Codes: C04B 2235/604 : Pressing at temperatures other than sintering temperatures
• CPC Class Codes: C04B 2235/6567 : Treatment time
• CPC Class Codes: C04B 2235/661 : Multi-step sintering
• CPC Class Codes: C04B 2235/72 : Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
• CPC Class Codes: C04B 2235/785 : Submicron sized grains, i.e. from 0,1 to 1 micron
• CPC Class Codes: C04B 2235/95 : Products characterised by their size, e.g. microceramics
• CPC Class Codes: C04B 2235/9653 : Translucent or transparent ceramics other than alumina
• CPC Class Codes: C04B 2235/9661 : Colour
• CPC Class Codes: C04B 35/486 : Fine ceramics
• CPC Class Codes: C04B 35/488 : Composites
• CPC Class Codes: C04B 35/6225 : Fibres based on zirconium oxide, e.g. zirconates such as PZT
• CPC Class Codes: C04B 35/62665 : Flame, plasma or melting treatment
• CPC Class Codes: C04B 35/62805 : Oxide ceramics
• CPC Class Codes: C04B 35/62815 : Rare earth metal oxides
• CPC Class Codes: C04B 35/62826 : Iron group metal oxides

Abstract

The invention relates to compositions based on ZrO₂, and single- and multi-coloured blanks made from oxide ceramics, and a process for their preparation, in which

• • a) oxide ceramic powder is coated with a colouring substance,
  • b) the coated powders are preferably graded and at least one coloured powder is filled into a compression mould,
  • c) the coloured powder or powders are compressed to produce a shaped body, and
  • d) the compressed shaped body is sintered to produce a blank,
    and to the use of these blanks for the preparation of dental restorations.

Claims

1. A composition comprising ZrO₂, the composition further comprising the following components in wt.-%:

23. The shaped body according to claim 21, wherein at least one layer has the composition according to claim 1.

2. A composition comprising ZrO₂, the composition further comprising the following components in wt.-%:

3. A composition comprising ZrO₂, the composition further comprising the following components in wt.-%:

4. A composition comprising ZrO₂, the composition further comprising the following components in wt.-%:

5. A multi-colored shaped body comprising a composition comprising ZrO₂ and further comprising the following components:

Pr, calculated as Pr₂O₃,

Fe, calculated as Fe₂O₃,

Tb, calculated as Tb₂O₃, and

Mn, calculated as Mn₂O₃,

in a total quantity of 0.0001 to 0.75 wt.-%,

wherein the multi-coloration is produced by differently colored layers.

6. The shaped body according to claim 5, wherein said composition comprises

Tb, calculated as Tb₂O₃, in a quantity of 0.0001 to 0.075 wt.-% and.

7. The shaped body according to claim 6, wherein said composition comprises the components in a total quantity of 0.0001 to 0.6 wt.-%.

8. The shaped body according to claim 7, wherein said composition comprises the components in a total quantity of 0.0004 to 0.37 wt.-%.

9. The shaped body according to claim 6, wherein said composition comprises the components in the following quantities, in wt.-%:

10. The shaped body according to claim 6, wherein said composition comprises Pr, calculated as Pr₂O₃, in a quantity of 0.0005 to 0.01 wt.-%.

11. The shaped body according to claim 6, wherein said composition comprises Fe, calculated as Fe₂O₃, in a quantity of 0.0005 to 0.4 wt.-%.

12. The shaped body according to claim 6, wherein said composition comprises Fe, calculated as Mn₂O₃, in a quantity of 0.0001 to 0.075 wt.-%.

13. The shaped body according to claim 6, wherein said composition comprises 4 to 8 wt.-% Y₂O₃.

14. The shaped body according to claim 6, wherein said composition comprises up to 1 wt.-% Al₂O₃.

15. The shaped body according to claim 6, wherein said composition is a powder composition and comprises 98.0 to 99.9999 wt.-% of nanoscale ZrO₂ powder.

16. The shaped body according to claim 15, wherein the nanoscale ZrO₂ powder has a specific surface area of ≧

100 m2*g-1.

17. The shaped body according to claim 15, wherein the nanoscale ZrO₂ powder has a primary particle size between 5 and 50 nm.

18. The shaped body according to claim 6, wherein said composition is obtainable by a process in which a powder based on ZrO₂ is coated with compounds of Pr, Tb, Fe and/or Mn.

19. The shaped body according to claim 18, wherein the powder is coated by means of fluidized bed coating.

20. The shaped body according to claim 6, wherein the shaped body is in the form of a blank, dental shaped part or dental restoration.

21. The shaped body according to claim 6, wherein the shaped body comprises at least 2 differently colored layers.

22. The shaped body according to claim 21, wherein the shaped body comprises up to 8 differently colored layers.

24. The shaped body according to claim 21, wherein at least one layer has a composition comprising ZrO₂, the composition further comprising the following components in wt.-%:

25. A dental restoration comprising the shaped body according to claim 21.

26. The dental restoration according to claim 25, wherein the dental restoration is in the form of a crown or a bridge.

30. A dental restoration part comprising the shaped body according to claim 21.

35. The shaped body according to claim 5, wherein the shaped body is in the form of a blank, dental shaped part or dental restoration.

36. The shaped body according to claim 5, wherein the shaped body comprises at least 2 differently colored layers.

37. The shaped body according to claim 36, wherein the shaped body comprises up to 8 differently colored layers.

38. A dental restoration comprising the shaped body according to claim 5.

39. The dental restoration according to claim 38, wherein the dental restoration is in the form of a crown or a bridge.

27. A single- or multi-colored body made from colored oxide ceramic powder having a ratio of oxide ceramic component to mixtures of coloring oxides, of 100:

0.0001 to 2.0 parts by weight, wherein Pr₂O₃, Fe₂O₃, Tb₂O₃ and Cr₂O₃ are used as coloring oxides and wherein Tb₂O₃is used in a quantity of 0.0001 to 0.075 wt. %.

28. The single- or multi-colored body according to claim 27, wherein the coloring oxides are selected from the oxides of the d- and f-elements of the periodic table.

29. The single- or multi-colored body according to claim 28, wherein oxides of V, Ti, Nd, Eu, Dy, Er and/or Yb are used as further coloring oxides.

31. A single- or multi-colored body made from colored oxide ceramic powder having a ratio of oxide ceramic component to mixtures of coloring oxides, of 100:

0.0001 to 2.0 parts by weight, wherein Pr₂O₃, Fe₂O₃, Tb₂O₃ and Mn₂O₃ are used as coloring oxides, wherein the coloring oxides are used in the following quantities, in wt.-%;

32. A single- or multi-colored body made from colored oxide ceramic powder having a ratio of oxide ceramic component to mixtures of coloring oxides, of 100:

0.0001 to 2.0 parts by weight, wherein Pr₂O₃, Fe₂O₃, Tb₂O₃ and Mn₂O₃ are used as coloring oxides, wherein the coloring oxides are used in the following quantities, in wt.-%;

33. A single- or multi-colored body made from colored oxide ceramic powder having a ratio of oxide ceramic component to mixtures of coloring oxides, of 100:

0.0001 to 2.0 parts by weight, wherein Pr₂O₃, Fe₂O₃, Tb₂O₃ and Mn₂O₃ are used as coloring oxides, wherein the coloring oxides are used in the following quantities, in wt.-%;

34. A single- or multi-colored body made from colored oxide ceramic powder having a ratio of oxide ceramic component to mixtures of coloring oxides, of 100:

0.0001 to 2.0 parts by weight, wherein Pr₂O₃, Fe₂O₃, Tb₂O₃ and Mn₂O₃ are used as coloring oxides, wherein the coloring oxides are used in the following quantities, in wt.-%;