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Does the casting mode influence microstructure, fracture and properties of different metal ceramic alloys?
Bauer, José Roberto de Oliveira; Grande, Rosa Helena Miranda; Rodrigues-Filho, Leonardo Eloy; Pinto, Marcelo Mendes; Loguercio, Alessandro Dourado.
  • Bauer, José Roberto de Oliveira; Federal University of Maranhão. Department of Dentistry I. São Luís. BR
  • Grande, Rosa Helena Miranda; University of São Paulo. Department of Dental Materials. São Paulo. BR
  • Rodrigues-Filho, Leonardo Eloy; University of São Paulo. Department of Dental Materials. São Paulo. BR
  • Pinto, Marcelo Mendes; University Nove de Julho. Department of Dental Materials. São Paulo. BR
  • Loguercio, Alessandro Dourado; State University of Ponta Grossa. Department of Restorative Dentistry. Ponta Grossa. BR
Braz. oral res ; 26(3): 190-196, May-June 2012. ilus, tab
Artículo en Inglés | 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.
Asunto(s)


Texto completo: Disponible Índice: LILACS (Américas) Asunto principal: Aleaciones de Cromo / Técnica de Colado Dental / Aleaciones de Cerámica y Metal Tipo de estudio: Estudios de evaluación Idioma: Inglés Revista: Braz. oral res Asunto de la revista: Odontología Año: 2012 Tipo del documento: Artículo / Documento de proyecto País de afiliación: Brasil Institución/País de afiliación: 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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Texto completo: Disponible Índice: LILACS (Américas) Asunto principal: Aleaciones de Cromo / Técnica de Colado Dental / Aleaciones de Cerámica y Metal Tipo de estudio: Estudios de evaluación Idioma: Inglés Revista: Braz. oral res Asunto de la revista: Odontología Año: 2012 Tipo del documento: Artículo / Documento de proyecto País de afiliación: Brasil Institución/País de afiliación: Federal University of Maranhão/BR / State University of Ponta Grossa/BR / University Nove de Julho/BR / University of São Paulo/BR