Fully ceramic dental prosthetic material and method for preparing same

A technology of dental restoration and raw materials, applied in dental preparations, pharmaceutical formulations, medical science, etc., can solve problems such as poor mechanical properties, differences in real teeth, poor optical properties, etc., and achieve the goal of improving mechanical properties and reducing the sintering temperature of the matrix Effect

Inactive Publication Date: 2010-12-29
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although cast ceramics, glass-infiltrated alumina ceramics, dense polycrystalline alumina ceramics and zirconia ceramics have been released and used clinically, there are still the following deficiencies: 1) cast ceramics, alumina-based glass-infiltrated composite ceramics It is mainly suitable for anterior teeth, and there is still a big gap with the strength requirements of posterior crown and bridge restorations (600-900Mpa); 2) Zirconia ceramics have good mechanical properties, but poor optical properties, which are still different from real teeth
Because its manufacturing process is made by directly adding the glass-glass phase into the matrix and firing, the glass phase becomes an impurity phase and exists in the composite structure. At the same time, 4Y-TZP is used, which has poor mechanical properties and cannot meet the requirements of dental restoration materials; and Different glass-ceramics have different properties, which determine the properties of the final composite material

Method used

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  • Fully ceramic dental prosthetic material and method for preparing same
  • Fully ceramic dental prosthetic material and method for preparing same
  • Fully ceramic dental prosthetic material and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Preparation of all-ceramic oral restorative material of the present invention

[0031] Al(NO 3 ) 3 As a precursor, prepare a solution with a concentration of 1 mol, and use NH 3 The pH of the aqueous solution is controlled to be 9, and the nano-alumina powder is prepared by hydrothermal treatment, alcohol washing, freeze-drying and sintering. ZrOCl 2 .8H 2 O is the precursor, adding 7.8% MolY (NO 3 ) 3 , prepared into a mixed solution with a concentration of 0.8mol, using NH3 aqueous solution as a precipitating agent, and controlling the pH to 9.2 to make zirconium and yttrium colloids undergo hydrothermal treatment, alcohol washing, freeze-drying, and sintering to obtain partially stable nano-zirconia powder. Alumina micropowders with a particle size of micron and nanometer-sized alumina and zirconia micropowders are selected and graded according to the principle of close packing. Among them, alumina with an average particle size of 2.8 μm accounte...

Embodiment 2

[0033] Embodiment 2: Preparation of all-ceramic oral restorative material of the present invention

[0034] Prepare alumina and zirconia powders by the method of Example 1, add partly dispersed nano-alumina and nano-zirconia powders, which form a rigid framework together with micron and submicron particles, wherein the average particle size of alumina is 2.8μm accounts for 50.1%, 0.1μm accounts for 13.5%, nanoscale Al 2 o 3 7%, nano zirconia accounted for 29.4%. The dosage ratio of the dispersant is: polyethylene glycol: sodium citrate: polyacrylamide=1:2:4. After the slurry is prepared, the bottom cap is coated with plastic according to the purpose of use, and after molding, it is pre-sintered at 1220°C to form a microporous matrix, and then at 1220°C, the biological glass-ceramics infiltrates into the interconnected micropores in a liquid phase to form Nano-scale microcrystalline film strengthens the composite structure. Wherein the weight percentage of biological glass-...

Embodiment 3

[0035] Embodiment 3: Preparation of all-ceramic oral restorative material of the present invention

[0036] Prepare alumina and zirconia powders by the method of Example 1, add partly dispersed nano-alumina and nano-zirconia powders, which form a rigid framework together with micron and submicron particles, wherein the average particle size of alumina is 2.8μm accounts for 51.7%, 0.1μm accounts for 10%, nanoscale Al 2 o 3 13.3%, nano zirconia accounted for 25%. The dosage ratio of the dispersant is: polyethylene glycol: sodium citrate: polyacrylamide=1:2:4. After the slurry is prepared, the bottom crown is coated with plastic according to the purpose of use, and after molding, it is pre-sintered at 1200°C to form a microporous matrix, and then at a temperature of 1220°C, the biological glass-ceramics infiltrates into the interconnected micropores in a liquid phase to form Nano-scale microcrystalline film strengthens the composite structure. Wherein the weight percentage of...

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Abstract

The invention provides a fully ceramic dental prosthetic material, which is a dental prosthetic material prepared from micron-scale and submicron-scale Al2O3, nano-scale Al2O3, nano-scale ZrO2 and biological glass-ceramic serving as raw materials. The invention also provides a method for preparing the fully ceramic dental prosthetic material. In the aluminum oxide/zirconium oxide/glass-ceramic composite material prepared by the invention, the used glass-ceramic serves as a reinforcement phase in the composite structure; the mechanical property of the compound can be greatly improved, the bending strength reaches 601.30 to 657.2MPa and the fracture toughness reaches 6.19 to 6.22MPa.ml/2, and the requirement of anterior and posterior dental crown and bridge restoration bodies can be met well; and the fully ceramic dental prosthetic material has high strength and toughness, can produce the optical effect similar to dentin, can be generally used for multi-unit bridges of anterior teeth and posterior teeth and has more attractive and realer color.

Description

technical field [0001] The patent of the present invention relates to an all-ceramic oral restorative material. It belongs to the field of preparation of inorganic composite materials. Background technique [0002] Because of its good biocompatibility, ceramic material is similar to human teeth in structure, color and texture, so it is known as the main material for repairing dentition defects in the 21st century. Although cast ceramics, glass-infiltrated alumina ceramics, dense polycrystalline alumina ceramics and zirconia ceramics have been released and used clinically, there are still the following deficiencies: 1) cast ceramics, alumina-based glass-infiltrated composite ceramics It is mainly suitable for anterior teeth, and there is still a large gap with the strength requirements of posterior crown and bridge restorations (600-900Mpa); 2) Zirconia ceramics have good mechanical properties, but poor optical properties, which are still different from real teeth. The stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K6/027
Inventor 廖运茂李伟张静超
Owner SICHUAN UNIV
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