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Published on: December 20, 2024
Elemental composition of imported porcelain-fused-to-metal crowns--a pilot study
J N Waddell1, L Girvan, J M Aarts
1Sir John Walsh Research Institute, School of Dentistry, University of Otago, Dunedin, New Zealand. neil.waddell@dent.otago.ac.nz
Objectives:
To identify any potentially toxic elements in porcelain-fused-to-metal (PFM) crowns and a bridge manufactured in China.
Materials And Methods:
Eight PFM crowns and part of a bridge were sourced from China for testing. They were given a typical glaze firing cycle prior to scanning electron microscope analysis. Electron dispersive spectroscopic spot and mapping analysis was carried out on the porcelain/metal collar interface areas in order to determine their elemental composition and distribution.
Results:
No toxic elements were detected. The alloy used in the crowns was a nickel-chromium base metal, and that in the bridge was a gold-palladium noble alloy. The veneering porcelain was similar to a standard dental veneering porcelain.
Conclusions:
Within the limitations of the testing method and small sample size, no toxic elements were detected.