[Clinical evaluation of the effect of gold alloy and Ni-Cr alloy porcelain fused metal crown restorations].
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.
Sun
Wei-ge
WG
Department of Stomatology, the 81th Hospital of PLA, Nanjing 210002, China.
Liu
Xiang-hui
XH
Zhang
Ling
L
Zhang
Chun
C
Xie
Ming-yi
MY
Zhou
Wen-juan
WJ
D000497:Alloys; D002858:Chromium Alloys; D003442:Crowns; D003776:Dental Porcelain; D005881:Gingiva; D006047:Gold Alloys; D006801:Humans
D000497:Alloys; D002858:Chromium Alloys; D006047:Gold Alloys; D003776:Dental Porcelain