3International Organization for Standardization. ISO/TR 10271 densistry-detex~ination of tarnish and corrosion of metals and alloys[S]. Switzerland, 1993.
4Pan J, Leygraf C, Thierry D, et al. Corrosion resistance for biomaterial applications of Ti02 films deposited on titanium and stainless steel by ion-bean-assisted sputtering [J]. J Biomed Mater Res, 1997,35(3) :309 - 318.
5Kim DS, Park C J, Yi YJ, et al. Comparison of cast Ti-Ni alloy clasp retention with conventional removable partial denture clasps [J]. J Prosthet Dent, 2004, 91 (4):374 - 382.
