Science and Technology of Energetic Materials

Vol.70, No.3 (2009)

Research paper

Application of explosive compaction technology to fabrication of medical porous-surfaced implants
Akira Chiba, Takateru Yamamuro, and Yasuhiro Morizono


Medical porous-surfaced implants have been shown to lead to higher bone/metal shear strength than other types of fixation. A problem that has been identified with porous surface implants is the loss of physical properties.
  Porous-surfaced titanium implants were fabricated by cylindrical explosive compaction method by using various pressure transmitting media, i.e. water, grease or paraffin. The shear strengths between a Ti rod and Ti particles, surface pore sizes and porosity ratios for the obtained Ti implants were measured. On the effect of transmitting media, the order of value of surface pore size is as follows grease > paraffin > water. The diameter of pore size is in the range between 180 µm and 361 µm when using T6 powders and between 265 µm and 514 µm when using T10 particle, respectively and these ranges are almost the same as the result of the pore size range of 50 to 400 µm by Bobyn et al.7). The obtained shear strength between a Ti rod and Ti particles in implants were in the range of 130-230MPa and were higher than that of bone itself (60MPa). On pressure transmitting media, the order of value on surface pore size for the shear strength was grease ≧ paraffin > water. The surface of the implants showed the porous shape for favorable to bone tissue growth.

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Explosive compaction, Porous-surfaced implants, Titanium particle, Pressure transmitting medium, Plasma rotating electrode process

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