Does the casting mode influence microstructure, fracture and properties of different metal ceramic alloys?
Braz. oral res
;
26(3): 190-196, May-June 2012. ilus, tab
Article
in English
| LILACS
| ID: lil-622933
ABSTRACT
The aim of the present study was to evaluate the tensile strength, elongation, microhardness, microstructure and fracture pattern of various metal ceramic alloys cast under different casting conditions. Two Ni-Cr alloys, Co-Cr and Pd-Ag were used. The casting conditions were as follows electromagnetic induction under argon atmosphere, vacuum, using blowtorch without atmosphere control. For each condition, 16 specimens, each measuring 25 mm long and 2.5 mm in diameter, were obtained. Ultimate tensile strength (UTS) and elongation (EL) tests were performed using a Kratos machine. Vickers Microhardness (VM), fracture mode and microstructure were analyzed by SEM. UTS, EL and VM data were statistically analyzed using ANOVA. For UTS, alloy composition had a direct influence on casting condition of alloys (Wiron 99 and Remanium CD), with higher values shown when cast with Flame/Air (p < 0.05). The factors 'alloy" and 'casting condition" influenced the EL and VM results, generally presenting opposite results, i.e., alloy with high elongation value had lower hardness (Wiron 99), and casting condition with the lowest EL values had the highest VM values (blowtorch). Both factors had significant influence on the properties evaluated, and prosthetic laboratories should select the appropriate casting method for each alloy composition to obtain the desired property.
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Index:
LILACS (Americas)
Main subject:
Chromium Alloys
/
Dental Casting Technique
/
Metal Ceramic Alloys
Type of study:
Evaluation studies
Language:
English
Journal:
Braz. oral res
Journal subject:
Dentistry
Year:
2012
Type:
Article
/
Project document
Affiliation country:
Brazil
Institution/Affiliation country:
Federal University of Maranhão/BR
/
State University of Ponta Grossa/BR
/
University Nove de Julho/BR
/
University of São Paulo/BR
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