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Related Experiment Videos

Orthodontic silver brazing alloys.

P J Brockhurst, H L Pham

    Australian Orthodontic Journal
    |October 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

    This study evaluated seven orthodontic silver brazing alloys, identifying cadmium-free options with lower flow temperatures and superior corrosion resistance. Some alloys with gallium and indium additions showed brittleness.

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    Area of Science:

    • Materials Science
    • Biomaterials Engineering
    • Metallurgy

    Background:

    • Orthodontic silver brazing alloys often contain cadmium, leading to health concerns.
    • High flow temperatures and crevice corrosion on stainless steel are significant drawbacks of current orthodontic solders.
    • Developing safer and more effective brazing alloys is crucial for orthodontic applications.

    Purpose of the Study:

    • To evaluate seven orthodontic silver brazing alloys for cadmium content, flow temperature, and corrosion resistance.
    • To identify alloys suitable for orthodontic use that mitigate the issues of cadmium presence and high temperatures.
    • To assess the impact of gallium and indium additions on alloy properties.

    Main Methods:

    • Seven different orthodontic silver brazing alloys were subjected to analysis.

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  • Alloys were tested for the presence of cadmium.
  • Flow temperatures and corrosion resistance were measured for each alloy.
  • The effects of adding gallium and indium were investigated.

    • Main Results:

    • Two of the seven alloys contained cadmium.
    • The lowest observed flow temperature was 629°C (cadmium-containing alloy) and 651°C (cadmium-free alloys).
    • Three alloys demonstrated corrosion resistance superior to the others.
    • Gallium and indium additions reduced flow temperature in some cases but introduced brittleness.

    Conclusions:

    • Cadmium-free orthodontic silver brazing alloys with improved properties are available.
    • Lower flow temperatures and enhanced corrosion resistance are achievable in orthodontic solders.
    • Additions of gallium and indium require careful consideration due to potential embrittlement.