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A kind of medical porous tantalum material for replacing dental bone and preparation method thereof

A technology of porous tantalum and dental bone, applied in the field of porous medical metal implant materials and its preparation, can solve the problems of mechanical properties such as ductility, compressive strength, insufficient bending strength, and affecting the processing of porous tantalum materials, so as to improve the biophase Capacitance and biological safety, good pore size uniformity of the finished product, and the effect of connected pore distribution

Active Publication Date: 2015-08-19
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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  • A kind of medical porous tantalum material for replacing dental bone and preparation method thereof
  • A kind of medical porous tantalum material for replacing dental bone and preparation method thereof
  • A kind of medical porous tantalum material for replacing dental bone and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1: Weigh polyvinyl alcohol, tantalum powder with an average particle diameter of less than 43 microns and an oxygen content of less than 0.1% and sodium bicarbonate and mix them uniformly to form a mixed powder, wherein polyvinyl alcohol accounts for 8%, sodium bicarbonate accounts for 27%, tantalum Powder accounted for 65%, all in volume percentage. Compression molding: the above mixed powder is pressed into polyurethane foam (pore diameter 0.48-0.89mm, density 0.015g / cm2) in an injection molding machine at 80Mpa 3 ~0.035g / cm 3 , hardness greater than 50°) in molding. Degreasing treatment: vacuum degree 10 -4 Pa, from room temperature to 400°C at a heating rate of 2.5°C / min, and hold for 100 minutes; then raise the temperature from 400°C to 700°C at a heating rate of 2°C / min, and hold for 220 minutes. Vacuum sintering: sintering in a vacuum furnace, the sintering temperature is 2000°C, the heat preservation is 2 hours, and the vacuum degree is 10 -4 Pa, the...

Embodiment 2

[0032] Embodiment 2: Weigh polyvinyl alcohol, tantalum powder with an average particle size less than 43 microns and an oxygen content of less than 0.1%, and sodium bicarbonate and mix them uniformly to form a mixed powder, wherein polyvinyl alcohol accounts for 6%, sodium bicarbonate accounts for 29%, tantalum Powder accounted for 65%, all in volume percentage. Compression molding: Add the above mixed powder into an injection molding machine and press it under 70Mpa 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 1°C / min, and hold for 60 minutes; then raise the temperature from 400°C to 800°C at a heating rate of 2.5°C / min, and hold for 180 minutes. Vacuum sintering: sintering in a vacuum furnace, the sintering temperature is 2100°C, the heat preservation is 4 hours, and the vacuum de...

Embodiment 3

[0034] Embodiment 3: Weigh polyvinyl alcohol, tantalum powder with an average particle diameter of less than 43 microns and an oxygen content of less than 0.1%, and sodium bicarbonate and mix them uniformly to form a mixed powder, wherein polyvinyl alcohol accounts for 10%, sodium bicarbonate accounts for 23%, tantalum Powder accounted for 67%, all by volume percentage. Compression molding: Add the above mixed powder into an injection molding machine and press it under 52Mpa 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, from room temperature to 400°C at a heating rate of 3°C / min and hold for 120 minutes; then at a heating rate of 1.5°C / min from 400°C to 750°C for 240 minutes. Vacuum sintering: sintering in a vacuum furnace, the sintering temperature is 2200°C, the heat preservation is 2.5 hours, and the vacuum degree is 10 -3 Pa, the sintering process is ...

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Abstract

A medical porous tantalum material for dental bone replacement and preparation method therefor, produced as follows: mixing tantalum powder, polyvinyl alcohol, and sodium bicarbonate into a powder mixture, press-forming the powder mixture into an organic foamed body, then degreasing, sintering, cooling, and performing a heating process. The pressure used during the press-forming is 50 to 100 Mpa. The diameter of the produced medical porous tantalum material pores is 30 to 50 mum. The porosity is 30% to 38%. The porous tantalum method of the present invention uses a purely physical molding method, so that the final porous tantalum material contains low concentration of impurities, thereby effectively enhancing the biocompatibility and biosafety. Measurements show that the impurity concentration is lower than 0.2%. The density reaches 10.34 to 11.67 g / cm3, the porosity reaches 30% to 38%, and the pore diameter reaches 30 to 50 mum. The elastic modulus reaches 4.5 to 6.0 Gpa, the bending strength reaches 120 to 130 Mpa, and the compressive strength reaches 100 to 140 Mpa. The porous tantalum of the present invention is applicable as a medical implant material for dental bone replacement.

Description

technical field [0001] The invention relates to a porous medical metal implant material and a preparation method thereof, in particular to a medical implant porous tantalum material replacing compact bone tissue and a preparation method thereof. Background technique [0002] 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 evenly distributed, or it should be consistent with the growth of human bone tissue as needed. , and reduce the weight of the material itself, so that it is suitable for human implantation. [0003] As for the refractory metal tantalum, due t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61L27/04A61L27/56C22C1/08C22C27/02
CPCC22C27/02C22C1/08A61L2430/02A61L27/04A61L27/047A61L27/56B22F3/1121
Inventor 叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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