Original scientific paper
Effects of Admixing Previously Cast Alloy on Co-Cr Alloy Hardness
Tatjana Klarić-Jurković
; School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Krešimir Kraljević
; School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Prosper Matković
; Zavod za materijale Metalurškog fakulteta Sisak Sveučilišta u Zagrebu
Abstract
The alloys o f chromium and cobalt are widely used in dentistry as they, considering their mechanical properties, represent the best substitute for expensive gold alloys. During the production o f various dental appliances, a greater amount o f the material is used then required by the size o f the appliance itself. The remaining material is often used for subsequent castings, as a measure o f economy. The aim o f the study was to examine the influence o f the addition o f various amounts o f an already cast alloy (B) on hardness o f the alloys o f chromium and cobalt. The properties o f the alloys were examined after the addition o f the previously cast alloy in percentages o f 0%, 25%, 50%, 75% and 100%.A ll samples were standardized and cast in a Nautilus (Bego) induction casting oven. After the treatment, the samples were examined. The results on hardness and their statistical analysis showed a significant difference between the examined alloys, the difference o f the nature o f the added components contributing more to it than the amount o f the already cast alloy (B).The values obtained were consistent to those found in literature. In conclusion, the addition o f a certain percentage o f the already cast alloy appears to have no significant effect on alloy hardness.
Keywords
cobalt-chromium alloy; hardness
Hrčak ID:
99266
URI
Publication date:
15.3.1994.
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