Sintering method and sintering furnace of zirconium oxide all-ceramic tooth

A sintering method, zirconia technology, applied in fluidized bed furnaces, furnaces, dentures, etc., to achieve the effects of easy mass production, lower production costs, and easy popularization

Inactive Publication Date: 2013-10-09
NANNING YUEYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of expensive production equipment and complex production process required for sintering zirconia all-ceramic teeth, the present invention provides a sintering method and a simple sintering method for zirconia all-ceramic teeth that are easy to ma

Method used

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  • Sintering method and sintering furnace of zirconium oxide all-ceramic tooth

Examples

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Effect test

Embodiment 1

[0019] Use 94% zirconia powder with a purity of 99% or more by weight, add 5% yttrium oxide and alumina as toughening agents and crystal phase stabilizers, and add a small amount of dentin coloring agent. Isostatically press the hydraulic machine for 4 hours, the pressure is 2000kg / cm 2 , The zirconia powder is pressed into a compact.

[0020] Use an ordinary CNC milling machine to process the blank, change the flat end milling cutter of the CNC milling machine to a small ball end milling cutter, enlarge it by 20%, and use special auxiliary software to make crown blanks.

[0021] Put the crown blank into a silicon carbide powder microwave sintering furnace for heating and sintering. When the heating temperature is 1300℃~1500℃, the temperature is accurately controlled to increase in a stepped manner. When the temperature rises to 1350℃, the temperature is kept constant for 20 minutes and rises to 1400℃ When the temperature is constant for 20 minutes, when it rises to 150℃, the tempe...

Embodiment 2

[0024] The basic materials and operating steps used in this example are basically the same as those in Example 1, except that the static pressing time of the hydraulic machine is extended to 6 hours. In addition, the crown blank is glued with a layer of dextrin and sintered at 1700°C before sintering. The zirconia powder that is no longer sintered at 1500°C is crushed once, and then sintered.

[0025] The zirconia all-ceramic teeth sintered in this example are in accordance with the requirements in shape and size, and the size is relatively consistent, the sintering shrinkage can be controlled at 20%, and the zirconia on the surface of the crown does not appear to adhere to silicon carbide powder. Transparency is also better. In addition, increasing the temperature during sintering can increase the transparency of the porcelain teeth, but the brittleness is also large, which can only be applied to certain anterior teeth.

[0026] In addition, for the sintering furnace used during ...

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Abstract

The invention provides a sintering method and a sintering furnace of a zirconium oxide all-ceramic tooth. The method is mainly characterized in that a layer of zirconium oxide powder which has been sintered once, repulverized and can be fritted no longer at the temperature of 1500 DEG C is adhered to a tooth crown blank by utilizing dextrin; then the tooth crown blank is embedded in silicon carbide powder of a silicon carbide powder microwave sintering furnace; microwaves are generated by microwave tubes and the silicon carbide absorbs the microwaves to produce heat; when the heating temperature is 1300-1500 DEG C, the temperature is accurately controlled to rise in a ladder shape, so that the tooth crown blank is converted into a high-density and high-strength zirconium oxide ceramic body; the sintering furnace comprises a silicon carbide powder heating body device, a furnace body heat insulating device, a microwave generator, a temperature sensor, control switches and instruments, and the structure of the sintering furnace is simple and durable. By adopting the sintering method provided by the invention, the production cost of the zirconium oxide all-ceramic tooth can be greatly lowered, and the zirconium oxide all-ceramic tooth is easy to produce in a large scale, and the practice of zirconium oxide ceramic tooth sintering technology also can be generally carried out among stomatology department students in medical colleges and universities.

Description

Technical field [0001] The invention relates to a processing method and processing equipment for dental artificial dentures, in particular to a sintering method and a sintering furnace for zirconia all-ceramic teeth. Background technique [0002] Zirconia all-ceramic teeth are artificial dentures made of zirconia powder and sintered at high temperature. Zirconia all-ceramic teeth have many advantages such as strong wear resistance, realistic appearance, good biocompatibility, etc., and because they do not contain Metal, it has no irritation to the gums, there will be no black line problem and blueness of the gums, and no allergic reaction. Therefore, zirconia all-ceramic restoration is a popular trend in international dental cosmetic restoration and a hot spot in the current international dental market. The general sintering method of zirconia all-ceramic teeth is to first press zirconia powder into zirconium blocks, then process the zirconium blocks into tooth-shaped blanks, and...

Claims

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Application Information

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IPC IPC(8): A61C13/083F27B15/20
Inventor 王玉元王粤凡
Owner NANNING YUEYANG TECH
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