1Yfantis C, Yfantis D, Anastasso J, et al. Analytical and lectorchemical evaluation of thein vitrocorrosion behavior of nickel-chiomeand cobalt-chrome casting alloys for metal ceramic restorations [J]. Eur J Prosthodont Restor Dent, 2007, 15(1): 33- 40.
2Lin HY, Bowers B, Wolan JT, et al. Metallurgica, 1 surface and corrosion analysis of Ni-Cr dental casting alloys before and after porcelainfiring [J]. Dent Mater, 2008, 24 (3): 378-385.
3Geurtsen W . Bio compatibility of dental casting alloys[J]. Crit Rev Oral BiolMed, 2002,13(1):71-84.
4Geurtsen W. Bio compatibility of dental casting alloys. Crit Rev Oral BiolMed, 2002, 13(1): 71-84.
5Person GR, Perouen TA, Page RC. Relationship between levels of as partate aminotransferase in gingival crevicular fluid and gingival inflam mation[J]. J Preiodont Res, 2001, 36 (1): 17-24.
6Kide Y, Kobayashi M, Suzuki T, et al. Interleukin-I stimulates cytokines, prosta-glandin E2 and matrix metalloproteinase-I production via activation of MAPK/ AP-I and NF-kappa B in human gingival fibroblasts [J]. Cykokine, 2005, 2(4): 159 - 68.
7Gallucci GO, Grutter L, Nedir R, et al. Esthetic outcomes with porcelain-fused-to-ceramic and all-ceramic singleimplant crowns: a randomized clinical trial[J]. Clin Oral Impl Res, 2011, 11(1): 62-69.
8Naumann M, Ernst J, Reich S, et al. Galvano-vs. metalceramic crowns: up to 5 -year results of a randomized split -mouth study [J]. Clinical Oral Investigations, 2011, 15(5): 657 - 660.
