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Novel method for preparing lithium-based casting ceramic block

A lithium-based, porcelain block technology, applied in the field of dental restorative materials, can solve the problems of high temperature coloring conditions, no mention of secondary coloring, and high equipment conditions, and achieve good biocompatibility, pure color, shape and shape. The effect of structural stabilization

Active Publication Date: 2011-08-17
SHENZHEN UPCERA DENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 5. Porcelain crowns are harder than enamel, which can cause wear on the opposing teeth
[0011] At present, the cast porcelain used in the market has disadvantages such as high price, high energy consumption, difficult coloring at high temperature, complex molding process, single product size, and high equipment requirements.
And at present, the main preparation method of cast porcelain is high-temperature melting method, which consumes a lot of energy, requires high temperature coloring conditions, and complex molding process
[0012] Researchers at home and abroad regard glass-ceramics with lithium disilicate as the main crystal phase as one of the research focuses. Among them, the US patent discloses the preparation technology and material properties of this material, but the preparation methods are all high-temperature melting methods. Involved in the preparation of sintering method
In domestic patents, such as patent numbers ZL200810226527.0, CN200710072597.0, CN200510010431.7, CN200910043711.6, etc., the preparation method of this material is mentioned, and the sintering method is also used to prepare it, but it is all one-time coloring, and no two-time coloring is mentioned. Secondary coloring process, and the strength does not exceed 350MPa
And the equipment conditions are high, and the preparation process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] Preparation of matrix glass powder:

[0044] The first step: take 200g of various matrix raw materials according to the above-mentioned ratio of parts by weight, wherein SiO 2 107.4g; Al(OH) 3 5.5g; Li 2 CO 3 56.2g; K 2 CO 3 9.2g; Al(PO 3 ) 3 5.9g; ZrO 2 4.7g; H 3 BO 3 11.1g, grinded in a ball mill for 2 hours and mixed evenly;

[0045] The second step: put the above-mentioned mixed raw material powder into a platinum crucible, raise the temperature, and when the temperature rises to 1500°C, keep the temperature for 1 hour to melt the raw materials to obtain a uniform glass liquid;

[0046] The third step: water-quench the glass liquid obtained in the second step to obtain fine glass pieces, which are dried at 120°C;

[0047] The fourth step: put the glass block obtained in the third step into an agate ball milling jar, add agate balls, and carry out ball milling in a ratio of material by weight: balls=1:2, and grind for 40 hours to obtain glass powd...

Embodiment 1

[0049]Step 1: Take 50g of the glass powder obtained above, and weigh 5g of the colorant iron oxide, put it into a ball mill jar and mix it for 3 hours according to the ratio of glass powder:iron oxide=10:1 in parts by weight, to make it evenly mixed , to obtain mixed powder;

[0050] The second step: put the mixed powder obtained in the first step into a mold, and perform isostatic pressing at a pressure of 250 MPa to obtain a cast porcelain body;

[0051] The third step: Put the cast porcelain body obtained in the second step into a resistance furnace for sintering, the heating rate is 10°C / min, the heating and sintering temperature is 920°C, the holding time is 10 minutes, and the cast porcelain material is obtained by cooling with the furnace , namely the lithium-based dental cast porcelain block of the present invention.

Embodiment 2

[0053] The first step: take 50g of the matrix glass powder obtained above, and weigh 2.5g of the colorant iron oxide, and put it into a ball mill in a ratio of glass powder:iron oxide=20:1 in parts by weight and mix for 2 hours to make It is mixed uniformly to obtain a mixed powder;

[0054] The second step: put the above-mentioned mixed powder into a mould, and perform isostatic pressing at a pressure of 200 MPa to obtain a cast porcelain body;

[0055] The third step: put the cast porcelain body obtained in the second step into a resistance furnace for sintering, the heating rate is 10°C / min, the heating and sintering temperature is 900°C, the holding time is 30 minutes, and the cast porcelain is obtained by cooling with the furnace The material is the lithium-based dental cast porcelain block of the present invention.

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Abstract

The invention belongs to the technical field of a dental prosthesis material and particularly relates to a novel method for preparing a lithium-based casting ceramic block. The method comprises the following steps of carrying out melting on the raw material, carrying out water quenching on the molten raw material, drying the obtained product, carrying out ball milling, mixing the obtained powder and a coloring agent, carrying out isostatic pressing forming, carrying out crystallization heat treatment and obtaining the product. In the method, substrate glass powder only needs to be prepared in one step and a crucible does not need to be cleaned; a user dose not need to worry about the chromatic aberration caused by high temperature valence alternation of variable valence metal ions; products with different colors can be produced; the lithium-based casting ceramic block is uniform to color and has pure color; the forming process is easy to operate; the diversity of product sizes can be realized; and the production energy consumption is low and energy is saved, so as to save the production cost, thereby solving the energy problem.

Description

Technical field [0001] The present invention is a technical field of dental repair materials, and especially involves a new type of lithium -based cast porcelain pieces. Background technique [0002] The casting porcelain teeth are all called casting ceramics full crowns, also known as full porcelain teeth.It is a new full -crowned repair body in recent years and is made of new types of ceramic materials for casting.First use wax to make a dental or bottom crown. After embedding, the wax is warmed up in a dedicated porcelain furnace. After melting the finished porcelain pieces, the porcelain teeth are cast after cooling.The ingredients of porcelain are lithium -based ceramics, with high strength, good light transmittance, good aesthetic effects, can be used for dental repair materials such as embedded, veneer, front teeth or rear tooth single crowns, 3 units of front tooth bridge. [0003] Due to the different materials, the porcelain teeth and porcelain teeth are essentially dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/14
Inventor 朱伟凤严庆云李英春
Owner SHENZHEN UPCERA DENTAL TECH
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