| Autor: |
FRIEDMAN, CHARLES M., SANDRIK, JAMES L., HEUER, MICHAEL A., RAPP, GUSTAV W. |
| Předmět: |
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| Zdroj: |
Journal of Dental Research; Sep1975, Vol. 54 Issue 5, p921-925, 5p, 1 Black and White Photograph, 3 Charts, 1 Graph |
| Abstrakt: |
Gutta-percha endodontic filling points were found to contain approximately 20% guttapercha (matrix), 66% zinc oxide (filler), 11% heavy metal sulfates (radiopacifier), and 3% waxes and/or resins (plasticizer). The mechanical properties were indicative of a partially crystalline viscoelastic polymeric material. They were found to obey Hooke's law and displayed a prominent upper and lower yield point when stressed beyond the proportional limit. The essential differences in mechanical properties of individual brands were found to be a function of the gutta-percha and zinc oxide concentration. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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