title: [Clinical evaluation of the effect of gold alloy and Ni-Cr alloy porcelain fused metal crown restorations].
abstract: OBJECTIVE
  To observe the clinical effect of gold alloy porcelain fused metal (PFM) crown restoration and Ni-Cr alloy PFM crown restoration.
  
  
  METHODS
  A total of 168 teeth from 48 patients were restored with gold alloy PFM crown. The other 48 patients, with a total of 179 teeth were restored with Ni-Cr alloy PFM crown. They were examined in integrality, retention, shade, cervical margin, and gingival health immediately, 6 months, one year, two years ,and three years after restoration. The date was analyzed by rank sum test using SPSS12.0 software package.
  
  
  RESULTS
  The clinical effect of Ni-Cr alloy PFM crown was as good as gold alloy PFM crown when checked up after cementation at once. However, when they were examined 6 months, one year, two years ,and three years after restoration, the clinical effect of gold alloy PFM crown group was significantly better than that of Ni-Cr alloy PFM crown, P<0.05.
  
  
  CONCLUSIONS
  The gold alloy PFM crown has better properties than Ni-Cr alloy PFM crown as a kind of long-term restoration, especially on the aspect of shade.
authors.affiliation: Department of Stomatology, the 81th Hospital of PLA, Nanjing 210002, China.
authors.forename: Wei-ge
authors.initials: WG
authors.lastname: Sun
authors.forename: Xiang-hui
authors.initials: XH
authors.lastname: Liu
authors.forename: Ling
authors.initials: L
authors.lastname: Zhang
authors.forename: Chun
authors.initials: C
authors.lastname: Zhang
authors.forename: Ming-yi
authors.initials: MY
authors.lastname: Xie
authors.forename: Wen-juan
authors.initials: WJ
authors.lastname: Zhou
mesh_terms: D000497:Alloys; D002858:Chromium Alloys; D003442:Crowns; D003776:Dental Porcelain; D005881:Gingiva; D006047:Gold Alloys; D006801:Humans
chemical_list: D000497:Alloys; D002858:Chromium Alloys; D006047:Gold Alloys; D003776:Dental Porcelain