Fabrication of the Porous Tantalum and Its Current Status Used as Orthopedics Implants Materials
Dewei ZHAO(), Junlei LI
Department of Orthopaedics, Affiliated Zhongshan Hospital of Dalian University, Dalian 116001, China
Cite this article:
Dewei ZHAO, Junlei LI. Fabrication of the Porous Tantalum and Its Current Status Used as Orthopedics Implants Materials. Acta Metall Sin, 2017, 53(10): 1303-1310.
Porous tantalum (PT) is an orthopedics implant material that has been developed rapidly in recent decades. PT exhibits excellent biocompatibility, outstanding comprehensive mechanical properties, initial stability originated from their high friction factor and long term stability from their good osteoinduction, which make it widely applied in clinical practice. In this review, state of the arts and recent deve-lopment in the field of porous tantalum used as orthopedics implant material have been summarized and commented, which consist of introduction of its background, advantages, preparation approaches, biological performance and application status on clinic. The prospects are also described.
Fund: Supported by National Science and Technology Pillar Program of China (No.2012BAI17B02), National Key Research and Development Program of China (No.2016YFC1102000), China Postdoctoral Science Foundation (No.171479) and Affiliated Zhongshan Hospital of Dalian University (No.DLDXZSYY-DK201701)
Fig.1 Microstrutures of the trabecular metal (TM)[8] (a) and cancellous bone (b)[9]
Bone tissue
Fabrication
Porosity
Pore size
Elastic
Compression
Compression
Fatigue
Ref.
method
%
μm
modulus
yield strength
strength
strength
GPa
MPa
MPa
MPa
Cortical bone
-
3~5
-
7~30
-
100~230
27~35
[1]
Cancellous
-
50~90
-
0.01~3.0
-
2~12
-
[1]
bone
CVD (based on porous
75~85
400~600
1.5±0.4
35.3±6.5
49.7±6.6
35
[9]
carbon scaffold)
CVD (based on porous
-
-
-
-
-
-
[17]
SiC scaffold)
Foam impregnation
59.4
300~500
1.73~2.72
35~51
50~73
-
[15]
method
Addictive
79.7±0.2
500
1.22±0.07
12.7±0.6
28.3±1.2
7.35
[20]
manufacturing
Powder metallurgy
-
100~400
2.0±0.3
-
50.3±0.5
-
[21]
Table 1 Comparisons of the pore structure and mechanical properties between bone tissue and porous tantalum fabricated by various processing methods[1,9,15,17,20,21]
Fig.2 Porous tantalum fabricated by various technological methods (a) chemical vapor deposition (CVD) on porous carbon scaffold[16] (b) CVD on porous SiC scaffold[17] (c) foam impregnation process on polyurethane[9] (d) additive manufacturing[20] (e) powder metallurgy[21]
Fig.3 Schematic of the preparation of TM by CVD
Fig.4 Flow chart for peparation of porous tantalum by foam impregnation process (PVA—polyvinyl alcohol, PU—polyurethane)
Fig.5 Flow chart for peparation of porous tantalum by powder metallurgy method
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