In vitro corrosion of dental Au-based casting alloys in polyvinylpyrrolidone-iodine solution
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概要
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The corrosion and tarnish behaviors of two Au-based casting alloys (ISO type 1 and type 4 Au alloys) and their constituent pure metals, Au, Ag, Cu, Pt, and Pd in a polyvinylpyrrolidone-iodine solution were examined. The two Au alloys actively corroded, and the main anodic reaction for both was dissolution of Au as AuI2−. The amount of Au released from the ISO type 1 Au alloy was significantly larger than that from the ISO type 4 Au alloy (P<0.05). Visible light spectrophotometry revealed that the type 1 alloy exhibited higher susceptibility to tarnishing than the type 4 alloy. The corrosion forms of the two Au alloys were found to be completely different, i.e., the type 1 alloy exhibited the corrosion attack over the entire exposed surface with a little irregularity whereas the type 4 alloy exhibited typical intergranular corrosion, which was caused by local cells produced by segregation of Pd and Pt.
著者
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Endo Kazuhiko
Division Of Biomaterials And Bioengineering Department Of Oral Rehabilitation School Of Dentistry He
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Ochi Morio
Division Of Fixed Prosthodontics And Oral Implantlogy Department Of Oral Rehabilitation School Of De
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Hirose Yukito
Division Of Fixed Prosthodontics And Oral Implantlogy Department Of Oral Rehabilitation School Of De
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ENDO Kazuhiko
Division of Biomaterials and Bioengineering, Department of Oral Rehabilitation, School of Dentistry, Health Sciences University of Hokkaido
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IDA Yusuke
Division of Biomaterials and Bioengineering, Department of Oral Rehabilitation, School of Dentistry, Health Sciences University of Hokkaido
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TAKASUSUKI Norio
Division of Fixed Prosthodontics and Oral Implantology, Department of Oral Rehabilitation, School of Dentistry, Health Sciences University of Hokkaido
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HIROSE Yukito
Division of Fixed Prosthodontics and Oral Implantology, Department of Oral Rehabilitation, School of Dentistry, Health Sciences University of Hokkaido
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