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Cobalt chrome alloy containing rare earth La for dental ceramic stent

A cobalt-chromium alloy, dental technology, applied in the field of oral restoration, can solve the problems of not being able to bake porcelain, and achieve good resilience

Inactive Publication Date: 2008-10-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing cobalt-chromium alloys used clinically cannot be directly fused to ceramics on the brackets made of them due to the low metal-ceramic bonding strength (shear strength of the rod-on-disk test, the same below).

Method used

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  • Cobalt chrome alloy containing rare earth La for dental ceramic stent
  • Cobalt chrome alloy containing rare earth La for dental ceramic stent
  • Cobalt chrome alloy containing rare earth La for dental ceramic stent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the designed chemical composition: Cr20.0%, Mo9.0%, La0.05%, Mn1.0%, Si2.0% (the balance is Co, both are mass percentages), using electrolytic cobalt (Co), metal Chromium (Cr), metal molybdenum (Mo), metal lanthanum (La), electrolytic manganese (Mn), crystalline silicon (Si), etc. are used as raw materials, which are melted in an induction furnace to obtain ingots. Clinically use high-frequency casting machine to make brackets and test rods for movable restoration, and use existing clinical porcelain furnaces and porcelain powders for porcelain firing. Necessary surface treatment should be carried out on metal brackets before porcelain firing. The porcelain firing process is in accordance with the requirements of porcelain powder instructions Process parameters and process execution. Because the alloy does not contain elements that may change the color of the ceramic, the color of the porcelain teeth made on the bracket is stable. The mechanical properties...

Embodiment 2

[0022] According to the designed chemical composition: Cr 23.0%, Mo 8.0%, La 0.03%, W 4.0%, Si 2.0%, Mn 1.0% (the balance is Co, both are mass percentages), using electrolytic cobalt (Co), metal chromium (Cr), metal molybdenum (Mo), metal lanthanum (La), metal tungsten (W), crystalline silicon (Si), electrolytic manganese (Mn), etc. are used as raw materials, which are melted in an induction furnace to obtain ingots. Clinically use high-frequency casting machine to make brackets and test rods for movable restoration, and use existing clinical porcelain furnaces and porcelain powders for porcelain firing. Necessary surface treatment should be carried out on metal brackets before porcelain firing. The porcelain firing process is in accordance with the requirements of porcelain powder instructions Process parameters and process execution. Because the alloy does not contain elements that may change the color of the ceramic, the color of the porcelain teeth made on the bracket is s...

Embodiment 3

[0024] According to the designed chemical composition: Cr 30.0%, Mo 6.0%, La 0.07%, W 5.0%, Si 1.2% (the balance is Co, both are mass percentages), using electrolytic cobalt (Co), metal chromium (Cr), Metal molybdenum (Mo), metal lanthanum (La), metal tungsten (W), and crystalline silicon (Si) are used as raw materials, which are melted in an induction furnace to obtain ingots. Clinically use high-frequency casting machine to make brackets and test rods for movable restoration, and use existing clinical porcelain furnaces and porcelain powders for porcelain firing. Necessary surface treatment should be carried out on metal brackets before porcelain firing. The porcelain firing process is in accordance with the requirements of porcelain powder instructions Process parameters and process execution. Because the alloy does not contain elements that may change the color of the ceramic, the color of the porcelain teeth made on the bracket is stable. The mechanical properties of the...

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Abstract

The invention relates the stove enamel support cobalt chromium alloy containing rare earth La used for teeth. The method uses the electrolysis Co, metal Cr, metal Mo, metal La, metal W, electrolysis Mn, and crystal Si as raw materials, getting the cast ingot by melting them in electric induction furnace. The chemical compositions are following: Cr 15.0-30.0wt%,Mo 4.0-9.0wt%, La 0.03-0.30wt%, Mn 0-2.0wt%, Si 0-3.0wt%, W 0-10.0wt%,C 0-0.2wt% and Co. The alloy can be made with the casting machine, stove enamel furnace, and porcelain. The alloy binding ability is improved because of the rare earth La. The test indicates: alloy bonding strength is 75MPa, strength for extension (sigmab ) is 800MPa, yield strength (sigma0.2) is 680MPa, elongation (delta5) is 18%, diamond pyramid hardness (HV) is 300-400, coefficient of thermal expansion (alphaRT-500Deg.C) is 13.4-14.5 mum / m / Deg.C, and casting shrinkage is 1.8-2.1%. The binding ring and bar, which are cast by cobalt chromium alloy, has the advantages of high intensity and good rebound elasticity. The invention is the ideal material.

Description

technical field [0001] The invention relates to the field of oral restoration, in particular to a cobalt-chromium alloy for dental porcelain brackets containing rare earth La. Using this alloy to make a movable restoration bracket can directly cast a metal bottom crown on the bracket, and perform porcelain firing on the bottom crown, which organically combines the beauty and durability of porcelain with the high strength and high toughness of metal. It is suitable for patients with many missing teeth and poor abutment conditions. It is a dental cobalt-chromium alloy casting material that combines the advantages of porcelain-fused-to-metal fixed restoration and bracket movable restoration. Background technique [0002] An ideal denture should not only restore good chewing function, but also be beautiful and durable. Metal-ceramic restorations have both the beauty of ceramics and the strength of metal, without the wear, staining, and aging of plastic teeth, and are increasing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/07A61K6/04
Inventor 李宁巢永烈文玉华刘长虹胥永刚朱智敏张伟吴峻岭
Owner SICHUAN UNIV
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