Abstract
Objective. To investigate the influence of high-speed and conventional sintering on the flexural strength (FS) of three zirconia materials initial and after artificial aging. Methods. Milled zirconia specimens (3Y-TZP: ZI and Zolid;4Y-TZP: Zolid HT+;Amann Girrbach AG;N = 288, n = 96/group) were sintered in a high-speed sintering protocol (final temperature 1580 degrees C, n = 48/subgroup) or a conventional sintering protocol (control group, final temperature 1450 degrees C, n = 48/subgroup). FS was tested initially and after artificial aging (10 h in an autoclave or 1,200,000 chewing cycles;n = 16/subgroup). Univariate ANOVAs, post-hoc Scheffe, partial eta-squared, Kolmogorov-Smirnov-, Kruskal-Wallis- and Mann-Whitney-U-test were performed (p < 0.05). Results. ZI showed the highest and HT+ the lowest FS, regardless of the sintering protocols and aging regimens (p < 0.001). High-speed sintered HT+ showed higher initial FS than the control group (p < 0.001). ZI (p < 0.001-0.004) and Zolid (p < 0.001-0.007) showed higher FS after thermo-mechanical aging. High-speed sintered HT+ showed higher FS in the initial stage (p < 0.001). The Weibull modulus of the three thermo-mechanically aged materials was negatively influenced by high-speed sintering. Significance. As shorter sintering times represent a cost and time efficient alternative, highspeed sintering is a valid alternative to conventional sintering protocols. (C) 2020 The Academy of Dental Materials.
| Dokumententyp: | Zeitschriftenartikel |
|---|---|
| Fakultät: | Medizin |
| Themengebiete: | 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit |
| ISSN: | 0109-5641 |
| Sprache: | Englisch |
| Dokumenten ID: | 85615 |
| Datum der Veröffentlichung auf Open Access LMU: | 25. Jan. 2022, 09:15 |
| Letzte Änderungen: | 25. Jan. 2022, 09:15 |
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