Dental Casting Alloys with a Low Content of Noble Metals

Authors

  • Gudbrand Øilo NIOM, Scandinavian Institute of Dental Materials, and Dental Faculty, Dental Technology, University of Oslo, Oslo, Norway
  • Nils Roar Gjerdet Department of Dental Materials, School of Dentistry, University of Bergen, Bergen, Norway

DOI:

https://doi.org/10.3109/00016358309162310

Keywords:

Dental materials, casting technique, fixed partial prosthesis

Abstract

Several physical properties such as strength (UTS and fracture and proof stress), modulus of elasticity, strain (elastic and plastic elongation), hardness, and hardening ability were determined for five low-gold alloys and two conventional gold casting alloys (types III and IV). The composition and the structure (pores and defects) of the cast tensile test specimens were also studied. The results showed that alloys with a low content of noble metals could have properties comparable to those of the traditional types III and IV dental gold casting alloys. A marked difference was seen in the plastic elongation (ductility). A great number of defects (pores and oxide inclusions) were also observed, especially in the specimens with a high content of both palladium and silver.

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Published

1983-01-01