Subcritical crack growth behavior and life data analysis of two types of dental Y-TZP ceramics

Mitov G, Gessner J, Lohbauer U, Woll K, Muecklich F, Pospiech P (2011)

Publication Type: Journal article

Publication year: 2011

Journal

Dental Materials Elsevier

Book Volume: 27

Pages Range: 684-691

Journal Issue: 7

DOI: 10.1016/j.dental.2011.03.010

Abstract

Objectives: The aim of this study was to evaluate the mechanical properties and the subcritical crack growth behavior of a presintered dental Y-TZP (Kavo Everest ZS) and a hot isostatic pressed Y-TZP (Kavo Everest ZH) and to perform life data analysis. Methods: For each material 150 bending bars were produced. The initial fracture strength was determined in a four-point bending test. The subcritical crack growth parameters n and A were determined in a dynamic fatigue method at four decreasing loading rates from 110 MPa/s to 0.11 MPa/s in distilled water at 38 °C. For each loading rate Weibull statistics were performed and the Weibull moduli m and characteristic strengths σ0 were calculated. Using these data, strength-fracture probability-life time (SPT) predictions were derived for 1 day, 1 year, 5 years and 10 years, based on a static crack growth mechanism. Results: The "hipped" Y-TZP ceramic exhibited a higher initial strength (σc = 1618.18), characteristic strength (σ0 = 837.15) and fracture toughness (KIC = 4.52 MPa/m^1/2) than the pre-sintered ceramic (σc = 1431, σ0 = 745.46 and KIC = 3.17 MPa/m^1/2, respectively). Fatigue parameters, n and A, were 28.5 and 7.97 × 10^-24 for Everest ZH and 30.15 and 5.47 × 10^-20 for Everest ZS. The predicted fracture stress at 5% failure probability for a lifetime of 10 years was 259.34 MPa for Everest ZH and 263.2 MPa for Everest ZS. Conclusions: Although the "hipped" Y-TZP showed favorable initial mechanical properties, no significant difference could be found in the susceptibility of both ceramics to subcritical crack growth and their long-term strength. © 2011 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

Authors with CRIS profile

Ulrich Lohbauer Medizinische Fakultät

Involved external institutions

Universität des Saarlandes (UdS)

Germany (DE)

How to cite

APA:

Mitov, G., Gessner, J., Lohbauer, U., Woll, K., Muecklich, F., & Pospiech, P. (2011). Subcritical crack growth behavior and life data analysis of two types of dental Y-TZP ceramics. Dental Materials, 27(7), 684-691. https://doi.org/10.1016/j.dental.2011.03.010

MLA:

Mitov, Gergo, et al. "Subcritical crack growth behavior and life data analysis of two types of dental Y-TZP ceramics." Dental Materials 27.7 (2011): 684-691.

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