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Zirconia dental ceramic with gradient change color and preparation method thereof

A technique of dental ceramics and gradient change, applied in the field of dental ceramics, can solve the problems of unsatisfactory natural tooth color distribution characteristics, single color, etc., and achieve the effect of easy operation, simple preparation process and stable effect

Inactive Publication Date: 2017-01-18
北京欧纳材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the currently prepared dental zirconia ceramic restoration materials have a single color, which cannot meet the color distribution characteristics of natural teeth.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Mix yttrium-stabilized zirconia color powders YSZ-A, YSZ-B, YSZ-C, and YSZ-D uniformly according to the following mass fraction ratios: 10%: 20%: 30%: 40%; 15%: 25%: 25%: 35%; 20%: 30%: 20%: 30%; and 25%: 35%: 15%: 25%; mixed evenly, measured by the color difference meter, the color is obtained from light to dark, adjacent colors Four mixed powders with color difference less than or equal to 10%. According to the above sequence, the four kinds of mixed powders were successively added into the forming mold for layering and stacking, and then dry pressing was carried out. The dry pressing forming pressure was 12MPa, and the pressure holding time was 10s. Then carry out cold isostatic pressing forming, the cold isostatic pressing pressure is 150MPa, and the holding time is 60s. Take out the shaped billet, put it into a sintering furnace for pre-sintering, the sintering temperature is 500°C, and the holding time is 90min. Afterwards, the green body is repaired, and the pr...

Embodiment 2

[0047] Mix yttrium-stabilized zirconia colored powders YSZ-E, YSZ-F, YSZ-G, and YSZ-H uniformly according to the following mass fraction ratios: 10%: 20%: 30%: 40%; 15%: 25%: 25%: 35%; 20%: 30%: 20%: 30%; 25%: 35%: 15%: 25%; mix evenly, and measure it with a color difference meter to get the color difference from light to dark and adjacent colors 4 kinds of mixed powders less than or equal to 10%. According to the above sequence, the four kinds of mixed powders were successively added into the forming mold for layering and stacking, and then dry pressing was carried out. The dry pressing forming pressure was 13MPa, and the pressure holding time was 20s. Then carry out cold isostatic pressing molding, the cold isostatic pressing pressure is 160MPa, and the holding time is 70s. Take out the shaped billet, put it into a sintering furnace for pre-sintering, the sintering temperature is 650°C, and the holding time is 100min. Afterwards, the green body is repaired, and the pre-sin...

Embodiment 3

[0049] Mix yttrium-stabilized zirconia color powders YSZ-I, YSZ-J, YSZ-K, and YSZ-L uniformly according to the following mass fraction ratios: 10%: 20%: 30%: 40%; 15%: 25%: 25%: 35%; 20%: 30%: 20%: 30%; 25%: 35%: 15%: 25%; mix evenly, and measure it with a color difference meter to get the color difference from light to dark and adjacent colors 4 kinds of mixed powders less than or equal to 10%. According to the above sequence, the four kinds of mixed powders were successively added into the forming mold for layering and stacking, and then dry pressing was carried out. The dry pressing forming pressure was 14MPa, and the pressure holding time was 40s. Then carry out cold isostatic pressing forming, the cold isostatic pressing pressure is 180MPa, and the holding time is 150s. Take out the shaped billet, put it into the sintering furnace for pre-sintering, the sintering temperature is 900°C, and the holding time is 140min. Afterwards, the green body is repaired, and the pre-si...

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Abstract

The invention provides a zirconia dental ceramic with gradient change color and a preparation method thereof. Specifically, the zirconia dental ceramic has more than 4 ceramic layers, the color of the more than 4 ceramic layers shows a gradient change from shallow to deep from bottom to top, wherein with a color gradient difference of adjacent ceramic layers of less than or equal to 10%, each ceramic layer contains 4-6 yttria-stabilized zirconia colored powder with different percentages, in terms of a total mass of 1000 parts, the 4-6 yttria-stabilized zirconia colored powder contains 950-980 parts of yttria-stabilized zirconia powder and 2-50 parts of colored rare-earth oxide powder. The zirconia dental ceramic with gradient change color provided by the invention has ceramic layers with a shallow-to-deep gradient change color from bottom to top, so that the zirconia dental ceramic provided by the invention has a natural transition color, which is close to the color distribution characteristics of natural teeth. In addition, the zirconia dental ceramic with gradient change color provided by the invention has the advantages of simple preparation process, stable effect and easy operation.

Description

technical field [0001] The invention relates to the field of dental ceramics, in particular to zirconia dental ceramics with gradient color changes and a preparation method thereof. Background technique [0002] As an all-ceramic restoration material for oral cavity, zirconia ceramics have characteristics similar to natural teeth in terms of biocompatibility, chemical stability and bending strength, making it recommended as a restoration material matching natural teeth. But a perfect restoration not only needs to meet clinical requirements in terms of mechanical properties, shape, and size, but also includes a color that can be close to that of natural teeth. However, most of the currently prepared dental zirconia ceramic restoration materials have a single color, which cannot meet the color distribution characteristics of natural teeth. [0003] Therefore, it is necessary to prepare a dental zirconia ceramic restoration material with obvious color gradient effect and satis...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/622
Inventor 宋希文包金小周芬牟仁德孙志辉袁慎波
Owner 北京欧纳材料科技有限公司
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