Mechanical properties and micro structural analysis of a NiCr alloy cast under different temperatures

Authors

  • Karina Andrea Novaes Olivieri School of Dentistry of São José dos Campos – UNESP-
  • Maximiliano P. Neisser School of Dentistry of São José dos Campos – UNESP
  • Paulo C. R. Souza School of Chemistry/ UNESP
  • Marco Antônio Bottino School of Dentistry of São José dos Campos

DOI:

https://doi.org/10.20396/bjos.v3i8.8641737

Keywords:

NiCr alloy. Casting temperatures. Mechanical properties

Abstract

The purpose of this study was to evaluate the chemical and metallurgical aspects, mechanical properties and hardness of the NiCr dental alloy when it was submitted to different castings temperatures. An NiCr alloy was cast, with lost wax technique, 20 specimens, separated in two groups of 10 each one, in two different casting temperatures: a) in accordance with the manufactures´ instructions (T1); b) above manufactures´ instructions (T2). It was done chemical and metallographic analysis witch scanning electron microscope in the alloy in these conditions: no cast, T1 and T2. It was determined mechanical properties and hardness, too. The microstructures were similar to no cast, T1 and T2. There was no significant difference between chemical analysis and to mechanical properties. The hardness of the T1 and T2 groups was greater than no cast group. Clinically, it may predict that when elevated temperatures were used, above manufacture´s recommendations (more than 100ºC), there will be failures in the prosthesis, like porosities, fissures or cracks.

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Author Biographies

Karina Andrea Novaes Olivieri, School of Dentistry of São José dos Campos – UNESP-

Graduated in Dentistry, São Paulo State University Araçatuba (1996), master's degree in Dentistry (Partial Fixed Prosthodontics) [SJCampos] the Universidade Estadual Paulista Julio de Mesquita Filho (2000) and a PhD in Dental Prosthesis, Universidade Estadual Paulista Julio de Mesquita Filho (2003). He is currently assistant professor at the Center for Dental Research São Leopoldo Mandic, assistant professor of São Leopoldo Mandic Dental and professor/ coordinator of the Paulista Association Dentists - Bragança Paulista- SP- in the area of Prosthodontics and Occlusion / TMD. She has experience in the field of dentistry, working 20 years in clinical practice, with emphasis in Prosthodontics. National and international publications in the areas of dental prosthesis, dental ceramics, implants.

Maximiliano P. Neisser, School of Dentistry of São José dos Campos – UNESP

Possui graduação em Odontologia pela Universidade de São Paulo (1972), mestrado em Odontologia (Prótese Buco-Maxilo Facial) [S.J.Campos] pela Universidade Estadual Paulista Júlio de Mesquita Filho (1992) e doutorado em Materiais Dentários pela Universidade Estadual de Campinas (1997).

Marco Antônio Bottino, School of Dentistry of São José dos Campos

has graduation at Odontologia by Universidade Estadual Paulista Júlio de Mesquita Filho (1968) and Ph.D. at Odontologia (Clínica Integrada) by Universidade de São Paulo (1973) . Currently is professor of Universidade Estadual Paulista Júlio de Mesquita Filho, Membro de corpo editorial of Revista da Associação Paulista de Cirurgiões Dentistas, Membro de corpo editorial of Revista Dental Press de Estética (Maringá), Membro de corpo editorial of Gaceta Dental, Membro de corpo editorial of Clínica. International Journal of Brazilian Dentistry, Membro de corpo editorial of Salusvita, Membro de corpo editorial of Pilares, Membro de corpo editorial of Ciência Odontológica Brasileira, Membro de corpo editorial of Pós-Graduação em Revista (FOSJC/UNESP), Revisor de periódico of Revista da Faculdade de Odontologia de Bauru, Membro de corpo editorial of RBP. Revista Brasileira de Implantodontia & Prótese sobre Implantes, Membro de corpo editorial of Implant News, Membro de corpo editorial of PCL. Revista Brasileira de Prótese Clínica & Laboratorial, Membro de corpo editorial of ImplantNews e Membro de corpo editorial of Implant News. Has experience in the area of Odontology. Focused, mainly, in the subjects: Prótese dentária, Cimentos dentários, Ciimentação, Coroas, Adaptação cervical. 

References

Hinman RW, Tesk JA, Whitlock RP, Parry EE, Durkowski JS. A technique for characterizing casting behavior of dental alloys. J Dental Res 1985; 64: 134-8.

Silva Filho CE, Muench A. Propriedades mecânicas, físicas e de corrosão, e custo relativo de uma liga com baixo conteúdo de ouro (46%). Rev Odontol Univ S Paulo 1989; 3: 390-3.

Van Noort R. Introduction of dental materials. 3.ed. London: Mosby; 1994.

Phillips RW. Materiais dentários de Skinner. 9.ed. Rio de Janeiro: Guanabara Koogan; 1993. 334p.

Mondelli J. Ligas alternativas para restaurações fundidas. São Paulo: Panamericana; 1995. 353p.

American Dental Associatoon. Guide to dental materials and devices: specification nº5 for dental casting gold alloy. 6.ed. Chicago: ADA, 1972; 182-5. apud Mondelli J. Ligas alternativas para restaurações fundidas. São Paulo: Panamericana; 1995. p.4-5.

Paffenbarger GG, Caul HJ, Dickson G. Base metal alloys for oral restoration. J Amer Dental Assoc 1943; 30: 852-62.

Guy AG. Ciência dos materiais. São Paulo: LTC, Ed. USP; 1980. 435p.

Souza SA. Ensaios mecânicos de materiais metálicos: fundamentos teóricos e práticos. 5.ed. São Paulo: Edgard Blücher; 1982. 286p.

Van Vlack LH. Princípios de ciência dos materiais. 8.ed. São Paulo: Edgard Blücher; 1988.

Lewis AJ. The analysis and compositional evaluation of a nickel base partial denture casting alloy. Aust Dent J 1974; 19: 389-94.

Baran GR. The metallurgy of Ni-Cr alloys for fixed prosthodontics. J Prosthet Dent 1983; 50: 639-50.

Bessiger C, Bergman M. Metallographic characterization of four alternative alloys intended for fixed prostheses. Acta Odontol Scand 1986; 44: 101-12.

Bumgardner JD, Lucas LC. Surface analysis of nickel-chromium dental alloys. Dent Mater 1993; 9: 252-9.

Lewis AJ. The effect of carbon on the metallography of a nickel base removable partial denture casting alloy. Aust Dent J 1979; 24: 90-3.

Lewis AJ. The metallography of a nickel base casting alloy. Aust Dent J 1975; 20: 298-303.

Lewis AJ. The effect of variation in the technique of metal fusion on the development of internal porosity in cast structures. Aust Dent J 1977; 22: 356-9.

Lewis AJ. The mechanism of tensile failure in a nickel-base casting alloy. J Dent Res 1977; 56: 631-4.

Lewis AJ. An eletron microprobe investigation of the extent of microsegregation occuring in base metal dental casting alloys. Aust Dent J 1979; 24: 171-3.

Moffa JP. Alternative dental casting alloys. Dent Clin North Am 1983; 27: 733-46.

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Published

2015-11-13

How to Cite

1.
Olivieri KAN, Neisser MP, Souza PCR, Bottino MA. Mechanical properties and micro structural analysis of a NiCr alloy cast under different temperatures. Braz. J. Oral Sci. [Internet]. 2015 Nov. 13 [cited 2022 Sep. 28];3(8):414-9. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8641737

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