Amount of metallic ions released from Ti-Ni alloy by abrasion in simulated bioliquids.
The current density of Ti-56mass%Ni (Ti-50at.%) alloy after abrasion in simulated bioliquids was measured using a potentiostat to estimate the amount of metallic ions released from the alloy during repassivation and maturation. The current density in saline, saline with and without N2 bubbling, and Hanks' solutions with and without proteins after abrasion was measured and the amount of released ion was calculated from the integrated current density with time, assuming that Ti4+ and Ni2+ are equivalently released. No difference in the amount of released ion was observed between saline with and without N2 bubbling. Also, no difference was observed between saline and pH 7.4 Hanks' solution. More Ti4+ and Ni2+ were released in bioliquids with proteins than in saline with and without N2 bubbling (p < 0.05). That is, dissolved oxygen and inorganic ions in Hanks' solution did not influence the amount of released ion, but proteins influenced it. The release of metallic ions from metals and alloys in biological systems can be estimated by the methodology employed in this study.
Watarai
M
M
Department of Orthodontics, School of Dentistry, University of Tokushima, Japan.
Hanawa
T
T
Moriyama
K
K
Asaoka
K
K
D000497:Alloys / Q000737:chemistry*; D001672:Biocompatible Materials; D020450:Heavy Ions; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D008956:Models, Chemical; D009532:Nickel / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D000497:Alloys; D001672:Biocompatible Materials; D012996:Solutions; C040654:titanium nickelide; D012965:Sodium Chloride; D009532:Nickel; D014025:Titanium; D009584:Nitrogen; D010100:Oxygen