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ORIGINAL ARTICLE
Year : 2008  |  Volume : 8  |  Issue : 2  |  Page : 78-82

A comparative evaluation of the effect of simulated porcelain firing cycle on the mechanical properties and microstructure of nickel-chromium-based ceramic alloys


1 Department of Prosthetic Dentistry, Rural Dental College and Hospital, Pravara Medical Trust, Loni-412 736, India
2 Department of Prosthetic Dentistry, Government Dental College and Hospital, Mumbai, India

Correspondence Address:
Sanjay B Lagdive
Department of Prosthetic Dentistry, Rural Dental College, Pravara Rural University, Loni
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-4052.43590

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The present study was carried out to evaluate the effect of porcelain firing cycle on the mechanical properties and microstructure of nickel-chromium-based alloys. Four different alloys were used: Supercast-np, d-Sign 10, Remanium CSe and Maxibond EMCS. Tensile bars and disks were prepared for testing according to specifications. For each alloy, ten tensile bars and six disks were prepared. For each alloy, five tensile bars and three disks were randomly selected for heat treatment. For heat treatment, the specimens were subjected to simulated porcelain firing cycle in a ceramic furnace. Both as-cast and heat-treated tensile bars were tested on a universal testing machine, and the values for the ultimate tensile strength, 0.2% offset yield strength and percentage elongations were obtained. Hardness was measured using Vickers's hardness tester. Microstructures were evaluated under an optical microscope. The data collected were tabulated and subjected to statistical analyses.


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