title: On the properties of two binary NiTi shape memory alloys. Effects of surface finish on the corrosion behaviour and in vitro biocompatibility.
abstract: The present paper compares the transformation behaviour and mechanical properties of two orthodontic wires of close chemical compositions. The effects of surface topography and surface finish residues on the potentiodynamic corrosion behaviour and biocompatibility are also reported. The cytotoxicity tests were performed on both alloys in fibroblast cell cultures from human gingiva using the MTT test. It is shown that the surface finish and the amounts of surface finish residues affect dramatically the corrosion resistance. Bad surface finish results in lower corrosion resistance. The in vitro biocompatibility, though not affected to the extent of corrosion resistance, is also reduced as the surface roughness and the amounts of residues increase. This is thought to be due to surface effects on corrosion and metallic ions release.
authors.affiliation: University of Applied Sciences, Surface and Thin Film Technology, Materials Testing and Joining, Kiel, Germany. mohammed.es-souni@fh-kiel.de
authors.forename: Mohammed
authors.initials: M
authors.lastname: Es-Souni
authors.forename: Martha
authors.initials: M
authors.lastname: Es-Souni
authors.forename: Helge
authors.initials: H
authors.lastname: Fischer-Brandies
mesh_terms: D000497:Alloys / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D002478:Cells, Cultured; D003343:Corrosion; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism; D005881:Gingiva / Q000166:cytology; D006801:Humans; D066298:In Vitro Techniques; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry; D009969:Orthodontic Wires; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D009532:Nickel; D014025:Titanium