In our recent study, we aimed to impart hydroxyapatite (HA)-forming to bioinert stainless steels (SUS316L). The surfaces of SUS316L specimen were treated by a sandblasting process using alumina grinding particles with 14.0 or 3.0 μm for average particle size, respectively. In addition, a doubled sandblasting process (DSP) using the 14.0 μm particles and subsequently 3.0 μm ones were also conducted. Compared with the case of the 14.0 μm particles, the 3.0 μm particles were available to increase the surface roughness and the surface area of the specimen. Moreover, these values were further increased in the case of the DSP. These specimens were soaked in simulated body fluid (SBF) at pH = 8.4, 25 °C and were directly heated in the solution by electromagnetic induction. By this treatment, formation of CaP was induced on each specimen. These materials performed high HA-forming ability in SBF. Average bonding strength of the HA film formed on them in SBF was increased depending on the increase of surface roughness and surface area. These results indicated that sandblasting condition was an important factor to improve interlocking effect related to the increase of the surface roughness and the surface area.
Micropores were formed on the surface of Ti-15Mo-5Zr-3Al alloy plate by doubled sandblasting process using silicon carbide particles with 14.0 μm and/or 3.0 µm average particle size by changing the combination of the size of particles. Apatite Nucleus (AN) was precipitated in the pores. By these treatments, bioactive AN precipitated Ti alloys were fabricated. Bioactivity of the Ti alloys was examined by soaking in SBF. Formed hydroxyapatite showed highest adhesive strength in the case of sandblasting using 14.0 μm particles then using 3.0 μm particles.
We formed many micropores on the surfaces of stainless steel (SUS) substrates by sandblasting method using alumina particles with 14 μm or 3 μm for average particle size and apatite nucleus (AN) treatment was operated. By these treatments, we provided bioactivity to the SUS substrates. We evaluated apatite-forming ability of the SUS substrate by soaking in a simulated body fluid. Apatite formation was induced on the surface of the substrate within 1 day. High adhesive strength of apatite layer was achieved by a mechanical interlocking effect between the apatite layer and the substrate. The adhesive strength was related to the size of the grinding particles in the sandblasting process.
Micropores were formed on the surfaces of stainless steel (SUS) by sandblasting methods and Apatite Nuclei (AN) were formed in the pores. By this treatments, a bioactive SUS was fabricated. Apatite-forming ability of the SUS was evaluated by immersing in an acellular simulated body fluid. Formation of bonelike apatite was induced on the surface of the SUS within 1 day. High bonding strength of the bonelike apatite layer was achieved by a mechanical interlocking effect between the bonelike apatite formed in the pores and the SUS specimen.
We precipitated Apatite Nucleus (AN) by raising pH of SBF. We mixed various concentration of AN in polylactic acid (PLA) and pressed by uniaxial press and cold isostatic press. We investigated the effect of AN concentration on bioactivity. We fabricated composite of PLA and AN configurating the shape by using 3D printer. The composite showed high bioactivity.
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