Multiple-oxide-doped gradient-color zirconia dental prosthesis and preparation method thereof

A zirconia and gradient color technology, applied in the field of gradient zirconia dental restorations and its preparation, to achieve stable effects, easy operation, and rich color control

Inactive Publication Date: 2015-08-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a lack of a dental zirconia ceramic restorative material with obvious color gradient effect, rich color control, and smooth and uniform color transition in the prior art to meet the color distribution characteristics of natural teeth.

Method used

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  • Multiple-oxide-doped gradient-color zirconia dental prosthesis and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The powders A, B, C, and D are proportioned by mass fraction: 10%: 10%: 10%: 70%; 13%: 13%: 13%: 61%; 16%: 16%: 16%: 52 %; 19%: 19%: 19%: 43%; 22%: 22%: 22%: 34% mixed evenly to obtain 5 different colored powder porcelain layers, wherein the adjacent porcelain layers contain A, B, The total mass fraction difference of C is 9%, and the stacking thickness of each layer is 15mm.

[0038] According to the above sequence, five kinds of powders were successively added into the forming mold for layering and stacking, the pre-drying pressure was 0.5Mpa, the dry-pressing pressure was 5MPa, and the holding time was 5s. Then carry out cold isostatic pressing forming, the cold isostatic pressing pressure is 200MPa, and the holding time is 60s. The prepared green body was put into a sintering furnace for pre-sintering, the sintering temperature was 850°C, and the holding time was 90 minutes. Then the plain embryo is engraved to ensure that the surface finish and size of the plain ...

Embodiment 2

[0041] The powders A, C, and D are proportioned by mass fraction: 12%: 10%: 78%; 14%: 12%: 74%; 16%: 14%: 70%; 18%: 16%: 66%; 20%: 18%: 62%; 22%: 20%: 58%; 24%: 22%: 54% Mix evenly to get 7 kinds of powder porcelain layers of different colors, in which the adjacent porcelain layers contain A and C The total mass fraction difference is 4%, and the stacking thickness of each layer is 20mm.

[0042] According to the above sequence, 7 kinds of powders were successively added into the forming mold for layering and stacking, the pre-drying pressure was 5Mpa, the dry-pressing pressure was 20MPa, and the holding time was 30s. Then carry out cold isostatic pressing forming, the cold isostatic pressing pressure is 120MPa, and the holding time is 90s. The prepared green body was put into a sintering furnace for pre-sintering, the sintering temperature was 750°C, and the holding time was 100min. Then the plain embryo is engraved to ensure that the surface finish and size of the plain em...

Embodiment 3

[0044] The powders B, C, and D are proportioned by mass fraction: 17%: 9%: 74%; 18%: 11%: 71%; 19%: 13%: 68%; 20%: 15%: 65%; 21%: 17%: 62%; 22%: 19%: 59%; 23%: 21%: 56%; 24%: 23%: 53%; 25%: 25%: 50% Mix well and get 9 kinds For powder porcelain layers of different colors, the difference between the total mass fractions of B and C in adjacent porcelain layers is 3%, and the stacked thickness of each layer is 13mm.

[0045] According to the above sequence, 9 kinds of powders were successively added into the forming mold for layering and stacking, the pre-drying pressure was 1Mpa, the dry-pressing pressure was 10MPa, and the pressure holding time was 18s. Then carry out cold isostatic pressing forming, the pressure of cold isostatic pressing is 80MPa, and the holding time is 120s. The prepared green body was put into a sintering furnace for pre-sintering, the sintering temperature was 550°C, and the holding time was 120 minutes. Then the plain embryo is engraved to ensure that ...

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Abstract

The invention discloses a multiple-oxide-doped gradient-color zirconia dental prosthesis and a preparation method thereof. The multiple-oxide-doped gradient-color zirconia dental prosthesis is formed by mixing and overlaying more than one of dental zirconia porcelain mixed powder A, B and C with powder D on each porcelain layer according to different mass fractions. The three mixed powder is obtained by respectively doping ErO2, CeO2 and Fe2O3 with zirconia porcelain raw materials. The powder D refers to undoped zirconia porcelain raw materials. The preparation method includes mixed powder preparation, pre-dry-pressing, dry pressing, cold isostatic pressure forming, pre-sintering, blank engraving and final sintering. The preparation method is simple and easy to operate, the obtained prosthesis is wide in color regulation range and uniform in transition and has similar distribution characteristics to a natural tooth, and attractiveness of the zirconia all-porcelain prosthesis is improved. In addition, through the dry pressing process added during forming, uniformity of a powder overlaying and mixing stage is guaranteed and sintering body volume density and strength are improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of dental ceramics, in particular to a gradient color zirconia dental restoration doped with various oxides and a preparation method thereof. technical background [0002] Compared with metal crowns and porcelain-fused-to-metal crowns, zirconia dental all-ceramic crowns have many advantages. Its high biocompatibility, high strength, and excellent aesthetics are incomparable to the latter. Compared with other all-ceramic restorations, it has great advantages in fracture toughness. It has been greatly developed in the past 20 years and has attracted more and more attention. In order to reproduce the natural tooth color, the clinical coloring methods for zirconia restorations are generally divided into two types: soaking the embryo body in the staining solution and directly doping the zirconia powder during the preparation process. In this way, the color of zirconia dental restorations can be ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622
Inventor 孙舒明田丰王家邦
Owner ZHEJIANG UNIV
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