9 research outputs found
Fabrication of chelate-setting hydroxyapatite cements from four kinds of commercially-available powder with various shape and crystallinity and their mechanical property
Formation and biological affinity evaluation of crystallographically aligned hydroxyapatite
Preparation of bioactive Ti and its alloys via electrochemical treatment in sulfuric acid solution
Effect of Magnesium, Strontium or Fluoride Ions on in vitro Activities of Odontoblast-like Cells (MDPC-23)
TEM observation of hydroxyapatite nanocrystals ionically-bonded onto the graftpolymer-modified PET substrate
Coating of hydroxyapatite films on titanium substrates by electrodeposition under pulse current
Coating of hydroxyapatite films on titanium substrates by elect rodeposition under pulse current
Titanium (Ti) metal substrates were etched in sulfuric acid (H2SO4) with concentrations of 25, 50, 75 and 97% at 60°C for 30 min. Hydroxyapatite (HA) films were deposited onto unetched and etched substrates by an electrodeposition method under a pulse current. The electrolyte was metastable calcium phosphate solution that had 1.5 times the ion concentrations of human body fluid, but did not contain magnesium ion at 36.5°C. Deposition times were 90 min. We used the average current density of 0.01 A/cm2 and ON time equal to OFF time of 15 s. In the electrodeposition, hydrogen was incorporated into the surface of the Ti substrates to form titanium hydride (TiH2) on the substrate surfaces. After the electrodeposition, all specimens were heated at 600°C for 60 min. The adhesion between apatite and substrates were greatly improved by the heat treatment for the substrates etched in 50 and 75% H2SO4. It is considered that in these specimens the anchoring effect due to the microstructural roughness formed by etching was enhanced by the shrinking of HA crystals during the heat treatment