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Time-dependent dissolution of amalgams into saline solution.

J L Ferracane, P Mafiana, C Cooper

    Journal of Dental Research
    |August 1, 1987
    PubMed
    Summary
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    Unpolished dental amalgams release more mercury and silver ions than polished ones, especially within three hours post-trituration. Surface film formation likely inhibits further ion dissolution from set amalgams.

    Area of Science:

    • Dental Materials Science
    • Biomaterials Research
    • Corrosion Science

    Background:

    • Dental amalgam is a widely used restorative material.
    • Understanding ion release from amalgam is crucial for assessing biocompatibility and longevity.
    • Surface characteristics, such as polish, may influence material degradation.

    Purpose of the Study:

    • To quantify mercury, silver, and copper ion dissolution from polished and unpolished low- and high-copper amalgams into saline.
    • To investigate the effect of time on ion release.
    • To evaluate the influence of surface finish on amalgam corrosion.

    Main Methods:

    • Atomic absorption spectrophotometry was used to measure ion concentrations.
    • Dissolution was studied over time in a saline environment.

    Related Experiment Videos

  • Polished and unpolished surfaces of low- and high-copper amalgams were tested.

    • Main Results:

    • Unpolished amalgam surfaces released significantly greater amounts of mercury and silver compared to polished surfaces.
    • The highest rate of ion release occurred within the first three hours after trituration for all amalgam types.
    • A low overall rate of ion dissolution was observed once the amalgam had set.

    Conclusions:

    • Surface polishing reduces the release of mercury and silver ions from dental amalgams.
    • Initial trituration time is critical for ion release, with diminishing rates thereafter.
    • The formation of a surface film during immersion appears to inhibit further ion dissolution from set amalgams, suggesting good long-term stability.