[Reactions at the nonprecious metal-ceramic interface during porcelain firing. (3) A commercial alloy forming much Cr oxide during firing].
To examine the interface reaction between porcelain and a commercial Ni-Cr dental alloy (containing higher Cr and Mo) during porcelain firing, electron probe microanalyzer (EPMA) and X-ray diffraction have been used to characterize the interface which has emerged by means of selective dissolution of the alloy caused by a bromine-methanol solution. Much Cr oxide was formed at the early stage of firing, and remained in the reaction layer even if the holding time at 960 degrees C was up to 8 minutes. As a result, many Cr atoms diffused into the porcelain layer, most of which was found to form oxides through X-ray diffraction. Moreover, the porcelain layer nearest to the oxide layer was deduced to be modified seriously.
Watanabe
K
K
Dental Materials and Technology, School of Dentistry, Niigata University.
Okawa
S
S
Miyakawa
O
O
Nakano
S
S
Shiokawa
N
N
Kobayashi
M
M
D002857:Chromium; D002858:Chromium Alloys; D017608:Chromium Compounds; D003735:Dental Casting Technique; D003776:Dental Porcelain; D004577:Electron Probe Microanalysis; D016876:Metal Ceramic Alloys; D009532:Nickel; D013499:Surface Properties; D014961:X-Ray Diffraction
D002858:Chromium Alloys; D017608:Chromium Compounds; D016876:Metal Ceramic Alloys; D002857:Chromium; D003776:Dental Porcelain; D009532:Nickel; C023600:chromic oxide