| Autor: |
Uy, J. N., Chiew Lian, J. N., Nicholls, J. I., Tan, K. B. C. |
| Předmět: |
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| Zdroj: |
International Journal of Prosthodontics; Jul/Aug2006, Vol. 19 Issue 4, p399-399, 1/3p |
| Abstrakt: |
This research studied the load-fatigue performance of full gold crowns cemented with 4 types of resin cement. Four resin cements (C & B Opaque [CBO], Calibra Esthetic [CE], RelyX Unicem [RU], and Panavia F [PF]) and a control, zinc phosphate cement (HYBond [HBZPC]) were tested. Fifty human maxillary premolars were prepared to an gingivo-incisal height of 4 mm at a convergence angle of 20 degrees. Full gold crowns were cast (Strator 3) and cemented with 1 of the 5 cements (n = 10). A total of 50 gold crowns were involved. A fatigue load of 73.5 N was applied at an angle of 135 degrees to the long axis of each specimen. The number of cycles to failure and the cement failure location were determined. Significant differences in cycles to failure were assessed by the nonparametric Kruskal-Wallis test, with follow-up Mann-Whitney tests. The results indicated that: (1) group CE had the highest rank of cycles to failure, and HBZPC had the lowest cycles to failure; (2) group CE was not significantly different from CBO, but had a significantly higher failure cycle count compared to PF, RU, and HBZPC; and (3) no significant difference was noted in the failure cycle count between RU and HBZPC. The authors concluded that not all tested resin cements had a superior fatigue life when compared with zinc phosphate cement. The authors, however, did not explain why the specimens were prepared to 20 degrees convergence. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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