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High-tenacity dental ceramic bracket material and preparation method thereof

A dental ceramic, high toughness technology, applied in the field of orthodontics, can solve the problems of cracking of common ceramic brackets, and achieve the effect of improving the flexural strength

Inactive Publication Date: 2012-09-19
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the shortage of existing ceramic bracket ingredients, the purpose of the present invention is to provide a high-toughness ceramic bracket material and a preparation method, thereby overcoming the cracking phenomenon of ordinary ceramic brackets during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of bracket materials: 1) Weigh 10 parts of zirconia powder with a particle size of 30 nm, 2 parts of yttrium trioxide powder with a particle size of 10 nm, 1 part of lauric acid, 5 parts of magnesia, and 82 parts by weight Alumina for later use; 2) First mix zirconia powder, yttrium trioxide powder and lauric acid ball mill evenly, then add magnesia, continue to ball mill the alumina and mix evenly, and take out the powder;

[0035] 2. Preparation of brackets: Press the powder prepared in the previous step into the molding mold at 2Mpa, heat up to 1400°C at a rate of 10°C / min under nitrogen protection, keep it warm for 2 hours, and cool to room temperature with the furnace.

[0036] 3. Bracket strength test: After the strength test, the compressive strength of the bracket is 1476Mpa, and the flexural strength is 793Mpa.

[0037]

Embodiment 2

[0039] 1. Preparation of bracket materials: 1) Weigh 20 parts of zirconia powder with a particle size of 10 nm, 5 parts of yttrium trioxide powder with a particle size of 10 nm, 5 parts of stearic acid, 2 parts of magnesium oxide, and 68 parts by weight. 2) First mix the zirconia powder, yttrium trioxide powder and lauric acid ball mill evenly, then add magnesia, continue to ball mill the alumina and mix evenly, and take out the powder;

[0040] 2. Preparation of brackets: Press the powder prepared in the previous step into the forming mold at 4Mpa, raise the temperature to 1500°C at a rate of 10°C / min under the protection of nitrogen, keep it warm for 2 hours, and cool to room temperature with the furnace.

[0041] 3. Bracket strength test: After the strength test, the compressive strength of the bracket is 1657Mpa, and the flexural strength is 868Mpa.

[0042]

Embodiment 3

[0044] 1. Preparation of bracket materials: 1) Weigh 5 parts of zirconia powder with a particle size of 20 nm, 3 parts of yttrium trioxide powder with a particle size of 20 nm, 2 parts of stearic acid, 1 part of magnesium oxide, and 68 parts by weight. 2) First mix the zirconia powder, yttrium trioxide powder and lauric acid ball mill evenly, then add magnesia, continue to ball mill the alumina and mix evenly, and take out the powder;

[0045] 2. Preparation of brackets: Press the powder prepared in the previous step into the forming mold at 4Mpa, heat up to 1600°C at a rate of 10°C / min under the protection of argon, keep it warm for 2 hours, and cool to room temperature with the furnace.

[0046] 3. Bracket strength test: After the strength test, the compressive strength of the bracket is 1586Mpa, and the flexural strength is 813Mpa.

[0047]

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Abstract

The invention relates to a high-tenacity dental ceramic bracket material and a preparation method thereof. The high-tenacity dental ceramic bracket material is characterized by taking aluminum oxide as a main component, nanometer zirconium oxide powder as a toughening agent, nanometer yttrium oxide as a phase stabilizing agent and fatty acid as a powder surface modifying agent, and comprises the nanometer zirconium oxide powder, nanometer yttrium oxide powder, the fatty acid, magnesium oxide and the aluminum oxide. The preparation method comprises the following steps of: uniformly mixing the nanometer zirconium oxide powder, the nanometer yttrium oxide powder and the fatty acid in a ball-milling mode; and adding the magnesium oxide and the aluminum oxide, and continuously performing ball-milling mixing until the mixture is uniform. The flexural strength of a dental ceramic bracket prepared by the method is obviously improved compared with that of other common dental ceramic brackets; and the flexural strength of a common dental ceramic bracket is not more than 700MPa commonly, but the flexural strength of the dental ceramic bracket prepared by the method can reach 900MPa.

Description

technical field [0001] The invention relates to the technical field of orthodontics, in particular to a high-toughness dental ceramic bracket material and a preparation method. Background technique [0002] Brackets are necessary devices in orthodontic treatment. There are two types of stainless steel and ceramics used clinically. Stainless steel has poor aesthetics, while ceramic brackets have translucency similar to tooth enamel, good anti-pollution and anti-discoloration capabilities. It is welcomed by the majority of patients, especially female patients. [0003] All ceramic brackets currently used are alumina ceramics, which can be divided into single crystal alumina ceramics and polycrystalline alumina ceramics according to their different manufacturing processes. The most obvious difference between the two lies in the difference in optical transmittance, and the light transmittance of single crystal alumina ceramics is better. Both have good resistance to pollution ...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 李志安肖群
Owner WUHAN UNIV
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