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Cordierite microcrystalline glass for silicon nitride dental ceramic facing porcelain and preparation method thereof

A technology of dental ceramics and glass-ceramics, which is applied in glass manufacturing equipment, glass pressing, glass molding, etc., can solve the problems of thermal expansion coefficient mismatch and large thermal expansion coefficient, and achieve lower thermal expansion coefficient, lower softening point and analysis The effect of crystal temperature

Active Publication Date: 2022-01-04
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current commercial veneering porcelain is mainly used for metal and zirconia ceramic crowns, which have a large coefficient of thermal expansion (10×10 -6 / °C), and the thermal expansion coefficient of silicon nitride (3~3.5×10 -6 / °C) serious mismatch, currently no Si 3 N 4 Porcelain Matching Veneer Porcelain Coverage

Method used

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  • Cordierite microcrystalline glass for silicon nitride dental ceramic facing porcelain and preparation method thereof
  • Cordierite microcrystalline glass for silicon nitride dental ceramic facing porcelain and preparation method thereof
  • Cordierite microcrystalline glass for silicon nitride dental ceramic facing porcelain and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] Cordierite glass-ceramic for silicon nitride dental ceramic veneer, made of the following components in mass percentage:

[0032] Kaolin Kaolin76%, SiO 2 1.2%, MgO9.8%, additives 13%; additives include sintering aids and crystal nucleating agents, sintering aids consist of 5% CaCO 3 , the nucleating agent consists of 4% ZrO 2 and 4% TiO 2 Composition.

[0033] The above-mentioned preparation method for the cordierite glass-ceramic of silicon nitride dental ceramic veneer porcelain, comprises the following steps:

[0034]S1. Preparation of cordierite glass body: weigh kaolin, Kaolin and SiO in proportion 2 , MgO, TiO 2 , ZrO 2 and CaCO 3 , put zirconia balls of the same quality as the above-mentioned solid materials into a wide-mouth plastic bottle, add deionized water with a total mass of 5 wt% of the solid materials, and mix on a roller mill for 4 hours; Put the crucible into a frit furnace and melt at 1550°C for 2 hours. After water quenching, glass particles ...

Embodiment 2

[0037] Cordierite glass-ceramic for silicon nitride dental ceramic veneer, made of the following components in mass percentage:

[0038] Kaolin Kaolin76%, SiO 2 1.2%, MgO9.8%, additives 13%; additives include sintering aids and crystal nucleating agents, sintering aids consist of 5% CaCO 3 , the nucleating agent consists of 4% ZrO 2 and 4% TiO 2 Composition.

[0039] The above-mentioned preparation method for the cordierite glass-ceramic of silicon nitride dental ceramic veneer porcelain, comprises the following steps:

[0040] S1. Preparation of cordierite glass body: weigh kaolin, Kaolin and SiO in proportion 2 , MgO, TiO 2 , ZrO 2 and CaCO 3 , put zirconia balls of the same quality as the above-mentioned solid materials into a wide-mouth plastic bottle, add deionized water with a total mass of 5 wt% of the solid materials, and mix on a roller mill for 4 hours; Put the crucible into a frit furnace and melt at 1600°C for 2 hours. After water quenching, glass particles...

Embodiment 3

[0043] Cordierite glass-ceramic for silicon nitride dental ceramic veneer, made of the following components in mass percentage:

[0044] Kaolin Kaolin76%, SiO 2 1.2%, MgO9.8%, additives 13%; additives include sintering aids and crystal nucleating agents, sintering aids consist of 5% CaCO 3 , the nucleating agent consists of 4% ZrO 2 and 4% TiO 2 Composition.

[0045] The above-mentioned preparation method for the cordierite glass-ceramic of silicon nitride dental ceramic veneer porcelain, comprises the following steps:

[0046] S1. Preparation of cordierite glass body: weigh kaolin, Kaolin and SiO in proportion 2 , MgO, TiO 2 , ZrO 2 and CaCO 3 , put zirconia balls of the same quality as the above-mentioned solid materials into a wide-mouth plastic bottle, add deionized water with a total mass of 5 wt% of the solid materials, and mix on a roller mill for 4 hours; The crucible is put into a frit furnace and melted at 1550°C for 2.5 hours. After water quenching, glass pa...

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Abstract

The invention belongs to the technical field of biological materials and preparation thereof, and provides cordierite microcrystalline glass for silicon nitride dental ceramic facing porcelain and a preparation method thereof, the cordierite microcrystalline glass is prepared from the following components by mass: 75-76% of kaolin, 1-2% of SiO2, 9-10% of MgO, and 10-13% of an additive; the additive comprises a sintering aid and a nucleating agent, the sintering aid is CaCO3, the nucleating agent is ZrO2 and TiO2, and the mass ratio of CaCO3 to ZrO2 and TiO2 is (4-5): (3-4): (3-4); the preparation method comprises the following steps: S1, preparing a cordierite glass blank; and S2, carrying out crystallization treatment, and cooling to room temperature to obtain the cordierite microcrystalline glass. The thermal expansion coefficient of the cordierite glass ceramic prepared by the method is matched with that of silicon nitride ceramic, and the bending strength, the fracture toughness, the Vickers hardness and the chemical solubility can meet the performance requirements of facing ceramic.

Description

technical field [0001] The invention belongs to the technical field of biological materials and their preparation, in particular to cordierite glass-ceramics used for silicon nitride dental ceramic veneer porcelain and a preparation method. Background technique [0002] Dental restorative ceramics are a class of materials used to repair tooth defects and replace missing dentition, thereby restoring teeth to anatomical form, function and aesthetics. The most widely used dental restoration materials are alumina ceramics and zirconia ceramics. The mechanical properties of alumina are much lower than that of zirconia and are gradually replaced by zirconia. Zirconia ceramic materials have the problem of aging under low temperature conditions, which can easily cause artificial implants to break and fail in clinical applications. Studies have found that silicon nitride ceramics have better biocompatibility, chemical stability and mechanical properties than alumina and zirconia ce...

Claims

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Application Information

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IPC IPC(8): C03C10/08C03C12/00C03B11/00C03B32/02
CPCC03C10/0045C03C12/00C03B11/00C03B32/02
Inventor 杨建姜磊王彤尹双潘丽梅罗涛李权汪洋
Owner NANJING UNIV OF TECH
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