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Silver solders exposed to cleansers.

H J Mueller, P L Fan, J W Stanford

    Journal of the American Dental Association (1939)
    |January 1, 1983
    PubMed
    Summary
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    The new Efferdent formulation does not increase stainless steel-silver solder corrosion. Differences in corrosion mechanisms, not increased damage, explain surface appearance changes observed with the new Efferdent product.

    Area of Science:

    • Materials Science
    • Electrochemistry
    • Corrosion Engineering

    Background:

    • Dental appliance cleaners can potentially cause corrosion of metallic components.
    • Stainless steel-silver solder alloys are used in some dental appliances.
    • Previous reports suggested increased corrosion with a new Efferdent formulation.

    Purpose of the Study:

    • To investigate the corrosion behavior of stainless steel-silver solder couples exposed to a new Efferdent formulation.
    • To compare the corrosion mechanisms of the new and original Efferdent formulations.
    • To determine if the new formulation causes a significant increase in corrosion damage.

    Main Methods:

    • Electrochemical testing of stainless steel-silver solder couples.
    • Surface analysis using microscopy to observe corrosion morphology.

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  • Chemical analysis of corrosion products.

    • Main Results:

    • The new Efferdent formulation leads to selective attack forming soluble zinc and copper chlorides, revealing the microstructure.
    • The original Efferdent formulation results in non-protective hydroxide and sulfide deposition, obscuring the microstructure.
    • Macroscopic observations of surface changes may not accurately reflect the extent of corrosion damage.

    Conclusions:

    • The new Efferdent formulation does not cause increased corrosion damage compared to the original formulation.
    • Differences in corrosion product formation and morphology explain the observed surface appearance changes.
    • Relying solely on visual inspection can lead to misinterpretations of corrosion severity.