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Preparation method of medical porous metal material substituting for dental bone

A porous metal and dental bone technology, applied in medical science, prosthesis, etc., can solve the problems of mechanical properties such as ductility, compressive strength, insufficient bending strength, and affect the processing of porous tantalum materials, so as to improve biocompatibility and Biosafety, good pore size uniformity of the finished product, and good quality stability

Active Publication Date: 2014-04-23
CHONGQING RUNZE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, porous tantalum, which is used as a medical implant material for compact bone tissue such as dental bone, has obvious deficiencies in mechanical properties such as ductility, compressive strength, and bending strength, and will affect subsequent research on porous tantalum. Processing of the material itself, such as cutting of molded parts, etc.

Method used

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  • Preparation method of medical porous metal material substituting for dental bone
  • Preparation method of medical porous metal material substituting for dental bone
  • Preparation method of medical porous metal material substituting for dental bone

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preparation example Construction

[0025] A kind of preparation method of the medical porous metal material that replaces dental bone is to select molding agent, pore-forming agent (the molding agent is one or more arbitrary combinations in stearic acid, zinc stearate, paraffin, synthetic rubber , the pore-forming agent is one or more of urea, sodium chloride, ethyl cellulose, and methyl cellulose in any combination) mixed with tantalum powder with an average particle size of less than 43 microns and an oxygen content of less than 0.1%. Mixed powder, the mixed powder is pressed into an organic foam at 50-100Mpa to form, and then degreased, sintered, cooled and heat-treated to obtain a porous tantalum material. The porous tantalum formed has a porosity of 20-30%. 5-30 μm in diameter.

[0026] More specifically, the above-mentioned porous tantalum is composed of 5-10% (by volume percentage) of the above-mentioned forming agent, 20-30% (by volume percentage) of the above-mentioned pore-forming agent and the balanc...

Embodiment 1

[0029] Embodiment 1: Take zinc stearate, tantalum powder with an average particle diameter of less than 43 microns and an oxygen content of less than 0.1% and methyl cellulose and mix them uniformly to form a mixed powder, wherein zinc stearate accounts for 6%, methyl cellulose accounts for 23%, and tantalum powder accounted for 71%, all calculated by volume percentage. Pressure molding: Add the above mixed powder into an injection molding machine and press it into a polyurethane foam (pore diameter 0.48-0.89mm, density 0.015g / cm2) at 62Mpa 3 ~0.035g / cm 3 , hardness greater than 50°) in molding. Degreasing treatment: vacuum degree 10 -4 Pa, heat up from room temperature to 400°C at a heating rate of 1.5°C / min, and hold for 110 minutes; then raise the temperature from 400°C to 700°C at a heating rate of 2.5°C / min, and hold for 210 minutes. Vacuum sintering: sintering in a vacuum furnace, the sintering temperature is 2000°C, the heat preservation is 2 hours, and the vacuum de...

Embodiment 2

[0031] Embodiment 2: take paraffin, average particle diameter less than 43 microns and niobium powder and urea with oxygen content less than 0.1% and mix uniformly into mixed powder, wherein paraffin accounts for 5%, ethyl cellulose accounts for 30%, and niobium powder accounts for 65%, All are calculated by volume percentage. Press molding; add the above mixed powder into an injection molding machine and press it under 65Mpa to a hole diameter of 0.56-0.72mm and a density of 0.025g / cm 3 , molded in polyurethane foam with a hardness of 50°-80°. Degreasing treatment: vacuum degree 10 -4 Pa, raise the temperature from room temperature to 400°C at a heating rate of 2°C / min, and hold for 100 minutes; then raise the temperature from 400°C to 800°C at a heating rate of 3°C / min, and hold for 200 minutes. Vacuum sintering: sintering in a vacuum furnace, the sintering temperature is 2100°C, the heat preservation is 4 hours, and the vacuum degree is 10 -4 Pa, the sintering process is...

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Abstract

The invention relates to a preparation method of a medical porous metal material substituting for a dental bone. The preparation method comprises the steps of mixing tantalum powder, a pore-forming agent and a forming agent to form mixed powder, and further pressing the powder into an organic foam body for forming, degreasing, sintering, cooling and performing heat treatment to prepare a porous tantalum material, wherein the press-forming pressure is 50-100Mpa, the pore-forming agent is one or more of urea, sodium chloride, ethyl cellulose and methyl cellulose, and the forming agent is one or more of stearic acid, zinc stearate, paraffin wax and synthetic rubber. According to the preparation method provided by the invention, tests prove that in the final porous tantalum material, the impurity content can be lower than 0.2%, the density can achieve 11.67-13.34g / cm<3>, the porosity can achieve 20-30%, and the pore diameter can achieve 5-30mu m; the elastic modulus can achieve 4.5-6.0Gpa, the bending strength can achieve 110-130Mpa, and the compressive strength can achieve 100-130Mpa. The porous tantalum material provided by the invention is very suitable for the medical implant material substituting for the dental bone.

Description

[0001] The application of the present invention is a divisional application with application number 201110295841.6, application date of September 29, 2011, and title of the invention "a preparation method of dental bone substitute medical porous metal material". technical field [0002] The invention relates to a preparation method of a medical porous metal implant material, in particular to a preparation method of a medical implant porous metal material replacing compact bone tissue. Background technique [0003] Porous medical metal implant materials have important and special uses in the treatment of bone tissue trauma, femoral tissue necrosis, and replacement of dense bone tissue such as dental bone. The common materials of this type include porous metal stainless steel and porous metal titanium. As a porous implant material used in the treatment of bone tissue trauma and femoral tissue necrosis, its porosity should reach 30-80%, and the pores should be all connected and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C27/02C22F1/18A61L27/04A61L27/56
Inventor 叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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