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Journal of Dental Research
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*CHROMIUM COMPOUNDS
*CHROMIUM, ELEMENTAL
*COBALT
*HYDROCHLORIC ACID
*MOLYBDENUM
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Etching Patterns of Co-Cr Alloys for Bonded Cast Restorations

K. Ekstrand

NIOM - Scandinavian Institute of Dental Materials, Forskningsveien 1, 0371 Oslo 3, Norway

I.E. Ruyter

NIOM - Scandinavian Institute of Dental Materials, Forskningsveien 1, 0371 Oslo 3, Norway

Resin-bonded bridges may replace missing teeth and act as splints in periodontal treatment. The objective of this study was to investigate the etch pattern after electrolytic etching of selected Co-Cr alloys in hydrochloric acid and to assess the changes in alloy composition after different etching times.

The alloys investigated were Vitallium, Wironit, Wironium, Nobilium Hard, and Niranium NN. Alloy specimens were electrolytically etched in a hydrochloric acid solution for 1, 2, 5, and 10 min. The etched specimens were examined in a light microscope and a scanning electron microscope (SEM). Different etching patterns were revealed in the various alloys.

Microprobe analyses after the etching of Vitallium showed generally that Co was released and that Cr content increased at the surface.

Journal of Dental Research, Vol. 66, No. 9, 1479-1484 (1987)
DOI: 10.1177/00220345870660091301
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