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Elastic constants of two dental porcelains

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Abstract

The development of stress that affects the bonding in porcelain-fused-to-metal (PFM) systems can be influenced by the temperature dependence of the elastic constants of both systems. Instead of using the normal, static procedure, e.g. determining the slope of a stress-strain curve, and measuring the lateral and vertical strains, in this study the sonic resonance technique was used to determine the elastic moduli for two dental bodyporcelains. The sonic resonance technique involves the determination of both the flexural as well as the torsional resonance frequencies. From these values both Young's,Y, and shear moduli,G, are determined. Since two elastic constants are sufficient to describe completely the elastic response of isotropic materials, it was also possible to compute, by usingY andG, the bulk modulus,B, and the Poisson's ratio. Resonant frequency measurements taken at elevated temperatures resulted in correspondingly lower values for the elastic constants. Young's and shear moduli for two dental porcelains obtained in the range from 20° C (293 K) to 500° C (773 K) are presented in this study. These data may in the future be used for refined stress calculations in PFM systems.

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Author information

Authors and Affiliations

  1. Dental and Medical Materials, Polymers Division, National Bureau of Standards, 20234, Washington, DC, USA

    Hans Rolf Käse & John Aloyius Tesk

  2. Department of Materials Science and Mineral Engineering, University of California, 94720, Berkeley, California, USA

    Eldon Darrel Case

Authors
  1. Hans Rolf Käse
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  2. John Aloyius Tesk
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  3. Eldon Darrel Case
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Additional information

On study leave from University of Göttingen, D-3400 Göttingen, West Germany.

Former NBS employee.

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Käse, H.R., Tesk, J.A. & Case, E.D. Elastic constants of two dental porcelains. J Mater Sci 20, 524–531 (1985). https://doi.org/10.1007/BF01026522

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  • DOI: https://doi.org/10.1007/BF01026522

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