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Journal of Dental Research
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Metallurgical Aspects of High-palladium Alloys

P.R. Mezger

Department of Occlusal Reconstruction, School of Dentistry, University of Nijmegen, Philips van Leydenlaan 25, 6525 EX Nijmegen, The Netherlands

A.L.H. Stols

Department of Submicroscopic Morphology, Medical School, University of Nijmegen, Philips van Leydenlaan 25, 6525 EX Nijmegen, The Netherlands

M.M.A. Vrijhoef

Department of Dental Materials, School of Dentistry, University of Nijmegen, Philips van Leydenlaan 25, 6525 EX Nijmegen, The Netherlands

E.H. Greener

Department of Biological Materials, Northwestern University, Dental School, 311 E. Chicago Avenue, Chicago, Illinois 60611

Nine commercial high-Pd alloys were investigated. Microstructure and phase composition were screened by x-ray diffraction, light microscopy, and an electron microprobe. After being etched, some high-Pd alloys revealed dendritic structures. The others showed a more homogeneous structure with distinct grain boundaries. Etching was necessary to reveal distinct structures, though the overall etching effect turned out to be limited. On unetched specimens, only a slight chemical heterogeneity could be determined. Except for one alloy, the systems turned out to have complex multi-phase structures. The main face-centered-cubic (fcc) phase was Pd-based. As secondary phases, body-centered-cubic (bcc) and/or simple cubic ones were detected. The latter phases were similar to a Cu3Ga and PdGa intermetallic compound, respectively. Face-centered-tetragonal (fct) structures reported by other investigators were not found.

Journal of Dental Research, Vol. 67, No. 10, 1307-1311 (1988)
DOI: 10.1177/00220345880670101201
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