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Accelerated corrosion analysis of dental amalgams
Author(s) -
RAVNHOLT GERT
Publication year - 1986
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1986.tb01799.x
Subject(s) - corrosion , dentistry , materials science , metallurgy , medicine
– The corrosion of powdered conventional and high Cu dental amalgam was studied in vitro under fixed conditions (100% oxygen, pH 4, and constant weak mechanical action). Results were retrieved from X‐ray diffraction of samples of amalgam and solid corrosion products Formed, in combination with recording of the HC1 consumed to maintain the fixed pH. In the conventional amalgam no corrosion of γ 1 occurred until all γ 2 had corroded, whereas in the high Cu amalgam corrosion of γ 1 occurred from the beginning, concurrent with corrosion of ε and ń. Corrosion products found were AgCl, Hg 2 Cl 2 , CuCl 2 ‐3Cu(OH) 2 , and SnO 2 . The results may be interpreted as follows: in the conventional amalgam the matrix phase γ 1 is anodically protected against corrosion as long as any γ 2 remians; in the high Gu amalgam the least noble phases ε and ń do not protect γ 1 in a similar way.