PMID: 9168865Jun 1, 1997Paper

Dissolution of mercury from dental amalgam at different pH values

Journal of Dental Research
M Marek

Abstract

Dissolution of mercury from dental amalgam has been shown to be diminished by the formation of a tin oxide film on the surface of the mercury-rich gamma 1 phase (Marek, 1990b). Since tin oxides dissolve at low pH values (Deltombe et al., 1974), acidic conditions in the oral cavity may cause an increase in the mercury release. The purpose of this study was to determine the effect of acidity in the range of pH 1 to pH 8 on the rate of mercury dissolution in synthetic saliva from tin-free and tin-containing gamma 1 phase and two commercial dental amalgams. The tested hypothesis was that pH affects mercury dissolution only when a protective oxide film dissolves in an acidic environment. After exposures of the specimens for 2 hr or 24 hr in sealed glass bottles, the solutions were analyzed by flameless atomic absorption spectrophotometry for mercury and silver. The results have shown pH-independent mercury dissolution in the range of pH 3 to 8, and a much faster dissolution at pH 1. At all pH values, more mercury dissolved from the tin-free phase than from the tin-containing phase, and the rate of dissolution was lowest for the dental amalgams. The results were affected by the length of the test exposure. The pH independence in a wi...Continue Reading

References

May 1, 1992·Journal of Dental Research·J L FerracaneT Okabe
Oct 1, 1988·Journal of Dental Research·D B Mahler, J D Adey
Oct 1, 1994·Journal of Dental Research·D B MahlerM A Fleming
Sep 1, 1993·Dental Materials : Official Publication of the Academy of Dental Materials·J L FerracaneT Okabe

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Citations

Feb 16, 2002·The Science of the Total Environment·M PizzichiniA Pompella
Aug 15, 2002·Dental Materials : Official Publication of the Academy of Dental Materials·David B MahlerMiroslav Marek
Dec 25, 2002·Dental Materials : Official Publication of the Academy of Dental Materials·T OkabeH Nakajima
Mar 17, 2004·Dental Materials : Official Publication of the Academy of Dental Materials·Noriko Horasawa, Miroslave Marek
Nov 21, 1998·Dental Materials : Official Publication of the Academy of Dental Materials·M Marek
Jan 5, 2002·Health Physics·A A HelalH A Madbouly
Feb 24, 2019·British Dental Journal·Y Y Takefuji

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