Published: Oct 1979
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Amalgam restorations, of known history and alloy type, which had been in service for two and a half to three years were replaced because of marginal deterioration. The restorations were carefully removed to preserve the structural details, including the deteriorated margins, and examined metallographically. The results indicated that three types of corrosion prevailed, A uniform type of attack was observed on interproximal areas with a layer of corrosion products consisting of tin oxide chlorides. A second type of corrosion was found to be corrosion of the γ2 phase, internally in the amalgam. Thirdly, cracks and intergranular corrosions were observed in areas of stress, which suggested that a stress corrosion type of attack can be responsible for marginal breakdown of amalgam restorations.
implant materials, dental materials, corrosion, amalgam restorations, degradation
Research associate, NIOM, Scandinavian Institute of Dental Materials, Oslo,
Director, NIOM, Scandinavian Institute of Dental Materials, Oslo,