Abstract
Objectives. Testing and comparing of different non-shaded zirconia materials (3Y-TZP, 4Y-TZP and 5Y-TZP) on optical and mechanical properties. Materials and methods. Zirconia materials (N = 320, Opaque O, Translucent T, Extra Translucent ET, High Translucent HT) were investigated on translucency, Martens parameter, biaxial flexural strength, Chevron-Notch-Beam (CNB) fracture toughness (K-IC) and grain size. The grain size was analyzed using a scanning electron microcopy (SEM). Univariate ANOVA, post-hoc Scheffe, partial eta-squared, Kolmogorov-Smirnov-, Kruskal-Wallisand Mann Whitney-U-tests (p < 0.05) were performed. The reliability of flexural strength was calculated with two-parametric Weibull analysis and 95 % confidence level. Results. The translucency of ET and HT increased with the thermo-mechanical aging (p < 0.001). The zirconia material and aging had no impact on the Martens hardness and the indentation modulus. ET showed the highest flexural strength values after initial and thermo-mechanical aging (p < 0.001 - 0.683). All four materials showed the highest flexural strength after thermo-mechanical aging after 1.2 Mio cycles. Thermo-mechanically (1.2 Mio cycles) aged HT presented the highest Weibull modulus (m = 15.0) regardless of aging. Within initial groups, T (p <= 0.001) showed the highest fracture toughness, followed by O (p <= 0.001), ET (p < 0.003) and HT (p <= 0.001). Significance. Translucency of ET and HT increases with thermo-mechanical aging. Chevron Notch-Beam (CNB) is a valid alternative to the single-edge-V-notched beam (SEVNB) method for testing fracture toughness. (c) 2020 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.
| Item Type: | Journal article |
|---|---|
| Faculties: | Medicine |
| Subjects: | 600 Technology > 610 Medicine and health |
| ISSN: | 0109-5641 |
| Language: | English |
| Item ID: | 99269 |
| Date Deposited: | 05. Jun 2023 15:31 |
| Last Modified: | 17. Oct 2023 15:00 |
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