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Gradient transparent zirconium oxide dental ceramic and preparation method thereof

A technology of zirconia ceramics and dental ceramics, which is applied in the field of gradient transparency zirconia dental ceramics and its preparation, can solve the problems such as the inconspicuous gradient effect of light transmission, and achieve the effects of easy operation, stable effect and simple preparation process

Active Publication Date: 2014-09-10
AIDITE (QINHUANGDAO) TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this kind of dental light-transmitting graded zirconia material can meet the light-transmitting requirements of dental anterior incisors, it only contains two different light-transmitting ceramic layers, and the light-transmitting gradual change effect is not obvious, so it cannot be better. Satisfies the characteristics of the natural tooth surface that the translucency gradually decreases from the incisal 1 / 3 to the cervical 1 / 3 of the tooth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix powders A and B according to mass fraction ratio: 20%: 80%; 30%: 70%; 40%: 60%; 50%: 50% and 60%: 40% and mix evenly to obtain 5 A mixed powder, where A Y 30%-A X 20%=10%. According to the above sequence, five kinds of mixed powders were successively added into the forming mold for layering and stacking, and then dry pressing was carried out. The pressure of dry pressing was 3MPa, and the pressure holding time was 30s. Then carry out cold isostatic pressing forming, the pressure of cold isostatic pressing is 10MPa, and the holding time is 100s. Take out the shaped billet, put it into a sintering furnace for sintering, the sintering temperature is 350°C, and the holding time is 90min. Finally, the green body is restored to obtain dental zirconia bisque ceramics with the characteristics of gradual transparency.

Embodiment 2

[0025] Powder A and C are mixed according to mass fraction ratio respectively: 0: 100%; 8%: 92%; 16%: 84%; 24%: 76%; 32%: 68% and 40%: 60% mix homogeneously, obtain 6 mixed powders, of which A Y 8% -A X 0=8%. According to the above sequence, the six kinds of mixed powders were successively added into the forming mold for layering and stacking, and then dry pressing was carried out. The pressure of dry pressing was 10MPa, and the pressure holding time was 25s. Then carry out cold isostatic pressing forming, the pressure of cold isostatic pressing is 14MPa, and the holding time is 60s. Take out the shaped billet, put it into a sintering furnace for sintering, the sintering temperature is 500°C, and the holding time is 100min. Finally, the green body is restored to obtain dental zirconia bisque ceramics with the characteristics of gradual transparency.

Embodiment 3

[0027] The powders A and D are proportioned by mass fraction: 0: 100%, 6%: 94%, 12%: 88%, 18%: 82%, 24%: 76%, 30%: 70% and 36%: 64% mixed evenly to obtain 7 kinds of mixed powders, of which A Y 6%-A X 0 = 6%. According to the above sequence, 7 kinds of mixed powders were successively added into the forming mold for layering and stacking, and then dry pressing was carried out. The forming pressure of dry pressing was 15MPa, and the pressure holding time was 20s. Then carry out cold isostatic pressing forming, the pressure of cold isostatic pressing is 16MPa, and the holding time is 150s. Take out the shaped billet, put it into a sintering furnace for sintering, the sintering temperature is 700°C, and the holding time is 110min. Finally, the green body is restored to obtain dental zirconia bisque ceramics with the characteristics of gradual transparency.

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Abstract

The invention discloses a gradient transparency zirconia dental ceramic and a preparation method thereof, which belong to the technical field of dental ceramic preparation. The raw material is mixed from 2-5 kinds of zirconia ceramic powders with different sintered transparency. The sintered zirconia ceramics gradually increase in transparency from the bottom to the top, and contain 5-11 porcelain layers with different transparency. The preparation method includes five steps of preparing mixed powder, dry pressing, cold isostatic pressing, pre-sintering and green body repairing. The preparation method of the invention is simple and easy, and the transparency distribution characteristics of the prepared dental zirconia all-ceramic material are similar to those of natural teeth, thereby improving the aesthetics of the zirconia all-ceramic restoration.

Description

technical field [0001] The invention belongs to the technical field of preparation of dental ceramics, in particular to a gradient transparency zirconia dental ceramic 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, bending strength and color, making it recommended as a restoration material matching natural teeth. Although the color and strength of the currently prepared dental zirconia ceramic restoration materials meet the clinical requirements, most of them have a single transparency, which cannot meet the distribution characteristics of the transparency of natural teeth. [0003] The application publication number is CN 102228408 A, and the Chinese patent titled "Dental Translucent Gradient Zirconia Material and Preparation Process" discloses a dental translucent gradient zirconia materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/622
Inventor 李洪文罗绍华李斌吴海艳陈莹莹王秀兰
Owner AIDITE (QINHUANGDAO) TECH CO LTD
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