3Shim HM,Oh KT,Woo JY,et al.Corrosion resistance of titanium silver al- loys in an artificial saliva containing fluoride ions[J].J Biomed Mater Res B Appl Biomater, 2005 ( 15 ) :23-34.
4Ritva N,Aune R.Twenty-year follow-up of metal-ceramic singlecrowns:a retrospective study [J].International Journal of Prosthodontics, 2008,17 ( 1 ) : 114-128.
