The glass transition temperature (T,) of a dental porcelain is a factor in determining the magnitude of residual stresses introduced in a dental porcelain during cooling of a porcelain-fused-to-metal prosthesis. Tg is known to vary with changes in heating or cooling rate. However, available commerci
Stress relaxation behavior of dental porcelains at high temperatures
β Scribed by Paul H. DeHoff; Suresh B. Vontivillu; Zhixin Wang; Kenneth J. Anusavice
- Book ID
- 113233713
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 684 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0109-5641
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work is necessary in this field. More experimental evidence would be equally useful, particulary concerning carbon blacks, for which the graphitic structure may also be considered as nearly twodimensional. Such studies are under way in our laboratory.
Closed-loop controlled isothermal 'constant-strain' stress relaxation tests (SRT) at different strains led to the conclusion that SRT cannot provide the anticipated viscous strain rate over a wide stress range; the stress exponent for power-law creep was found to depend on strain. The recovery phase