Influences of multiple firings and aging on surface roughness, strength and hardness of veneering ceramics for zirconia frameworks.
In: Journal of Dentistry, Jg. 43 (2015-09-01), Heft 9, S. 1148-1153
academicJournal
Zugriff:
Objectives: To evaluate the effects of multiple firings and aging on surface roughness, strength, and hardness of veneering ceramics for zirconia frameworks. Methods: Five different veneering ceramics for zirconia frameworks were used: Vintage ZR (ZR), Cerabien ZR (CZR), VitaVM9 (VM9), Cercon ceram KISS (KISS), and IPS e.max ceram (e.max). Specimens were fired 2 or 10 times in order to accelerate aging. Surface roughness was evaluated using laser profilometry. Flexural strength and Vickers hardness were also measured. Surface topography was observed using scanning electron microscopy. Results: After accelerated aging, the surface roughness of all specimens fired 10 times was significantly lower than that of the same specimens fired 2 times (P=0.000). Except for VM9, the flexural strength of all specimens fired 10 times was greater than that of the same specimens fired 2 times, and the differences were significant for ZR and CZR (P<0.01). The flexural strength of VM9 fired 10 times was significantly lower than that of VM9 fired 2 times (P=0.034). The Vickers hardness of ZR and VM9 fired 10 times was significantly higher than that of the same specimens fired 2 times (P<0.05), but that of KISS fired 10 times was significantly lower than that of KISS fired 2 times (P=0.000). Conclusions: Multiple firings had a positive effect on the surface roughness of all aged veneering ceramics used for zirconia restorations and on the strength and hardness of many aged veneering ceramics used for zirconia restorations. [ABSTRACT FROM AUTHOR]
Titel: |
Influences of multiple firings and aging on surface roughness, strength and hardness of veneering ceramics for zirconia frameworks.
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Autor/in / Beteiligte Person: | Tang, Xuehua ; Luo, Huinan ; Bai, Yang ; Tang, Hui ; Nakamura, Takashi ; Yatani, Hirofumi |
Link: | |
Zeitschrift: | Journal of Dentistry, Jg. 43 (2015-09-01), Heft 9, S. 1148-1153 |
Veröffentlichung: | 2015 |
Medientyp: | academicJournal |
ISSN: | 0300-5712 (print) |
DOI: | 10.1016/j.jdent.2015.06.006 |
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