A study on the color difference between Au-Pt alloy porcelain and Ni-Cr alloy porcelain.
- Author:
Yong LI
1
;
Yunfeng ZHAO
;
Hong LI
Author Information
- Publication Type:Journal Article
- MeSH: Chromium; Chromium Alloys; Dental Porcelain; Dental Prosthesis Design; Gold Alloys; Humans; Metal Ceramic Alloys; Nickel; Platinum; Prosthesis Coloring
- From: West China Journal of Stomatology 2003;21(3):217-219
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo investigate the color difference between Au-Pt alloy porcelain and Ni-Cr alloy porcelain.
METHODS30 metal-ceramic specimens with different dentin porcelain thickness were fabricated with two types of metal-ceramic alloy, each type of alloy had 15 specimens. L*, a*, b* were measured after opaque porcelain was applied, and dentin porcelain was fired 1, 3, 5, 7 times by MINOLTA CR-100. Then delta E was calculated which reflected the color difference between high-gold alloy porcelain and Ni-Cr alloy porcelain.
RESULTSComparing with Ni-Cr alloy porcelain, the color of Au-Pt alloy porcelain was reddish, yellowish and less bright. The delta E between high-gold alloy porcelain and Ni-Cr alloy porcelain in shade A2 was largest when opaque porcelain was applied. It decreased when dentin porcelain was applied. It became smallest when fired 3 times, and increased along with the increase of fire times. It was larger than 1.5 except firing 3 times. When dentin porcelain was applied, delta E which was larger than 1.5 among different dentin porcelain thickness decreased along with the increase of dentin porcelain thickness.
CONCLUSIONThe color difference between the two types of metal-ceramic alloy should be carefully taken into account in order to improve the quality of color matching.