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Related Experiment Videos

Metal release from high-copper amalgams containing palladium

T H Lin1, C C Chan, K H Chung

  • 1School of Dentistry, National Yang-Ming Medical College, Taipei, Taiwan, R.O.C.

Zhonghua Yi Xue Za Zhi = Chinese Medical Journal; Free China Ed
|March 1, 1994
PubMed
Summary

Adding palladium to high-copper dental amalgam significantly reduces the release of mercury and copper corrosion products. This finding is crucial for understanding the long-term stability and safety of palladium-containing dental materials.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Electrochemistry

Background:

  • High-copper dental amalgams are widely used restorative materials.
  • The incorporation of palladium into these amalgams has been achieved.
  • The impact of palladium on the corrosion behavior of dental amalgams was previously unknown.

Purpose of the Study:

  • To investigate the effect of palladium addition on the electrochemical properties of high-copper dental amalgams.
  • To quantify the release of corrosion products from palladium-containing amalgams.
  • To compare the corrosion behavior of experimental palladium-containing amalgams with commercial dental amalgams.

Main Methods:

  • Fabrication of high-copper amalgams with varying palladium concentrations (0.42-3.33 w%).

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  • Exposure of amalgam specimens to Ringer's solution at 37°C for 3 months.
  • Serial analysis of released Ag, Sn, Cu, Pd, Zn, and Hg using graphite furnace and cold vapor atomic absorption techniques.

    • Main Results:

    • Release of Ag and Sn cations was comparable between palladium-containing and commercial amalgams.
    • Cu and Hg cation release decreased with increasing palladium concentration.
    • Amalgams with 1.7 w% Pd showed an order of magnitude lower release of Cu and Hg compared to commercial controls.

    Conclusions:

    • Palladium addition to high-copper amalgam alloys effectively reduces the release of mercury and copper.
    • This reduction in corrosion product release suggests improved stability and potentially enhanced biocompatibility of palladium-containing amalgams.