Polycrystal zirconium oxide ceramic dental material and preparation thereof

A technology of zirconia ceramics and ceramic teeth, which is applied in dental preparations, dentistry, dentures, etc., can solve the problems of affecting the aesthetic effect of ceramic teeth, durability and reliability, and easy aging of fiber-reinforced resin, so as to facilitate industrial production, Reliable performance and stable product quality

Inactive Publication Date: 2005-06-01
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although metal dental posts have good strength and toughness, potential corrosion and ion dissolution will endanger the reliability of dental posts
Fiber-reinforced resins are prone to aging, and their durability and reliability are also affected
In addition, the color of these two types of dental post materials is very different from that of human teeth, and it will appear dark gray in ceramic crowns, which will affect the aesthetic effect of ceramic teeth.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Using Y-ZrO 2 Ceramic powder, the average particle size is 0.4μm. First heat the mixer to 150°C, add 7wt.% polyethylene (PE) to the mixer, then slowly add paraffin (5wt.%) and diethyl phthalate (DEP) (3wt. %), after being completely melted. Zirconia ceramic powder is then added, and the ceramic powder accounts for 85wt.% by weight. Knead for about 30 minutes to achieve a completely uniform state without agglomeration. Finally, the mixed material is taken out to cool, and then crushed and granulated to obtain granular material.

[0038] Add about 500 grams of the above-mentioned granulated pellets into the cylinder of the injection molding machine and melt them, inject the molten feed into the mold under the injection pressure of 120MPa, cool for 2 minutes, and then the zirconia ceramic tooth post can be demolded green body.

[0039] Put the green body into an alumina crucible, and fill corundum sand around the sample, raise the temperature in the muffle furnace to ...

Embodiment 2

[0042] Using Y-ZrO 2 Ceramic powder, the average particle size is 0.2μm. First heat the two-roller kneader to 135° C., add 8 wt.% polystyrene into the kneader, and melt and knead for about 5 minutes. Paraffin (8 wt.%) and dibutyl phthalate (DBP) (4 wt.%) were added slowly. Then add zirconia ceramic powder, the ceramic powder accounts for 80wt.% by weight. Mix for 35 minutes to achieve complete homogeneity. Finally, the mixed material is taken out to cool, and then crushed and granulated to obtain granular material.

[0043] Add about 500 grams of the above-mentioned granulated pellets into the cylinder of the injection molding machine and melt them slowly, inject the molten feed into the mold under the injection pressure of 80MPa, cool for 3 minutes, and then the zirconia ceramic tooth post can be demolded green body.

[0044] Put the green body into an alumina crucible, fill corundum sand around the sample, raise the temperature in the muffle furnace to 550°C at a rate o...

Embodiment 3

[0047] Using Y-ZrO 2Ceramic powder, the average particle size is 0.6μm. First heat the two-roller kneader to 180°C, add 5wt.% polymethyl methacrylate into the kneader, and then slowly add microcrystalline paraffin (5wt.%) and phthalic acid di Octyl esters (2 wt.%). Zirconia ceramic powder is then added, and the ceramic powder accounts for a weight percentage of 88wt.% of the total amount. Mix for 40 minutes to achieve complete homogeneity. Finally, the mixed material is taken out to cool, and then crushed and granulated to obtain granular material.

[0048] Add about 500 grams of the above-mentioned granulated pellets into the cylinder of the injection molding machine and melt them, inject the molten feed into the mold under the injection pressure of 100MPa, cool for 2 minutes, and then the zirconia ceramic tooth post can be demolded green body.

[0049] Put the green body into an alumina crucible, and fill corundum sand around the sample, raise the temperature in the muf...

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Abstract

The invention relates to a polycrystalline zirconia ceramic tooth post material and a preparation method thereof, belonging to the technical field of preparation of ceramic materials. It is characterized in that: the material contains zirconia ceramic powder as the initial raw material, a polymer binder, and a low-molecular additive, and the proportion thereof is: 80-90wt% of zirconia ceramic powder, 5-10wt% of polymer binder, 5-10wt% of low-molecular additives. The preparation method includes four steps of mixing and granulation, injection molding, thermal degreasing and sintering. The thermal degreasing temperature is 500-800°C, and the sintering temperature is 1350-1550°C. The organic binder system for injection molding of the present invention has good fluidity and high density of the molded green body, and the density of the ceramic product after sintering is greater than 6.0 g/cm 3 ;The sintering shrinkage and deformation of the formed green body are small, which ensures the dimensional accuracy of the product; the bending strength of the prepared ceramic tooth post is greater than 600MPa, and the fracture toughness is as high as 13MPa.m 1/2 , elastic modulus 140MPa, Vickers hardness 1050 ~ 1200MPa. The preparation process has good repeatability and is convenient for industrialized production.

Description

technical field [0001] The invention relates to a polycrystalline zirconia ceramic tooth post material and a preparation method thereof, belonging to the technical field of preparation of ceramic materials. Background technique [0002] A dental post is a commonly used dental material in dental restorations. The currently used dental post materials mainly include metal and inorganic fiber reinforced resin, such as stainless steel dental post and carbon fiber reinforced resin dental post. Although metal dental posts have good strength and toughness, potential corrosion and ion dissolution will jeopardize the reliability of dental posts. However, fiber-reinforced resins are prone to aging, and their durability and reliability are also affected. In addition, the color of these two types of post materials is very different from that of human teeth, and it will appear dark gray in ceramic crowns, which will affect the aesthetic effect of ceramic teeth. [0003] The above-menti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61C13/083A61K6/02A61K6/083C04B35/622C04B35/632
Inventor 谢志鹏张振庭李建保高虹郑东翔高卫民
Owner TSINGHUA UNIV
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