KR20070075074A - Dental zirconia block - Google Patents

Abstract

A dental zirconia block is provided to improve strength, biocompatibility, and aesthetic sense, and to reduce medical expenses by frequent break of existing alumina block by using zirconia instead of alumina. The dental zirconia block is manufactured by planning an optimum chemical composition with an excellent material property such as 50-70% of SiO2,10-20% of ZrO2, 10-30% of K2O and Na2O, and 5% of others, mixing raw materials according to the composition, drying the mixture, melting the mixture at 1300-1700 deg.C for 2 hours, and calcining the mixture at 700-1000 deg.C for 2 hours.

Description

Dental Zirconia Blocks {Dental Zirconia Block}

1 is a comparison of the present invention and the conventional dental block

2 is a flow chart of the glass powder manufacturing process of the dental block

3 is a manufacturing process diagram until a molded product comes out

4 is a completed molded body (block)

<Description of the symbols for the main parts of the drawings>

1,4 Porcelain 2 Opaque

3: Metal 5: Ceramic (Block)

6: Raw Materials 7,16: Mixing

8,19: Drying 9: Melting

10: Calcination 11,17; Forming

12: Milling 13, 14: Glass powder

15: Leucite 18: Heating

20,22: molded body (Bellet, Block) 21: evaluation items

The present invention relates to a material of an artificial tooth ceramic used in a dental prosthesis, and more particularly, to a method of making a zirconia block having high aesthetics and strength, which is used as a prosthesis for a natural tooth restoration and an artificial tooth restoration process using a zirconia ceramic material. It is about.

Generally, it is used as a material of metal (alloy)-> metal + alumina-> alumina (ceramic).

As an example, as shown in (a) of FIG. 1, an artificial tooth was formed by wrapping it with an opaque layer (2) and coating a ceramic material (1) on the metal (3) to remove metal color. Allergy and darkline formation have recently improved the esthetics by replacing Al2O3 with high biocompatibility with high strength instead of metal. However, Al2O3, which is currently used a lot, could improve the aesthetic advantages, but the brittle nature of ceramics exposed to the risk of fracture, which further increases the demand for improvement.

The present invention replaced Al2O3 with ZrO2 having high strength, good biocompatibility and aesthetics to solve the brittle problem. In order to achieve the above object, the invention is superior to natural teeth with the composition of SiO2 (50 ~ 70%) ZrO2 (10 ~ 20%) K2O + Na2O (10 ~ 30%) other 5%. Optimal chemical composition design with, the step of environmental variables during Melting for about 2 hours at 1300 ~ 1700 ℃ in the manufacturing process after the design

After the step is characterized in that the heat treatment for about 2 hours at 700 ~ 1000 ℃.

Hereinafter, described in detail by the accompanying drawings as follows.

Figure 2 is a glass powder manufacturing process of the dental block, raw material (6) SiO2 (50 ~ 70%) ZrO2 (10 ~ 20%) K2O + Na2O (10 ~ 30%) other 5% composition of the optimum chemical composition design After mixing so that it can be finely mixed (7) as finely as possible, the dried (8) powder is charged into a platinum crucible and dissolved (9) in an electric furnace at 1300 to 1700 ° C., followed by calcination (10).

Next, after the quenching, the molding 11 and the crushing 12 may be performed to obtain the glass powder 13. 3 is finely mixed (16) the glass powder 14 and the lusite (15) having excellent adhesion and strength in this state to form (17) in a constant mold and dried after heat treatment 500 ~ 1000 ℃ in an electric furnace After this, pellets (blocks) that are shaped bodies can be obtained. After the block is obtained, mechanical strength and properties are evaluated (21) to obtain a complete block.

4 shows a molded body having a diameter of 11.24 and a height of 8.36 as a completed block.

As described above, the present invention can expect enormous import substitution effects by replacing dental alumina blocks, which were imported at a high price, with domestically developed zirconia blocks, and also expecting back exports. In addition, medical expenses, which were additionally generated due to frequent fractures due to the existing alumina blocks, can be greatly reduced, and aesthetics similar to natural teeth can provide high satisfaction for the cost.

Claims (1)

In the process of manufacturing the preform prior to being used as a dental prosthesis, Optimum chemical composition design with better physical properties than natural teeth SiO2 (50 ~ 70%) ZrO2 (10 ~ 20%) K2O + Na2O (10 ~ 30%) other 5% Step of environmental variables in the manufacturing process after the design Melting step for about 2 hours at 1300 ~ 1700 ℃, Heat treatment at 700-1000 ° C. for about 2 hours after the step

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