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Comparison of fracture toughness measurements for zirconia materials using two test methods


Jansen, Jan Ulrich; Lümkemann, Nina; Sener, Beatrice; Stawarczyk, Bogna (2019). Comparison of fracture toughness measurements for zirconia materials using two test methods. Dental Materials Journal, 38(5):806-812.

Abstract

To determine the influence of the fracture toughness (K$_{IC}$) methods [single-edge-V-notch-beam (SEVNB) and chevron-notch-beam (CNB)] as well as an optional heat treatment on the K$_{IC}$ of three different zirconia generations (1st: ZI, 3rd: FX, 4th: HT). One hundred and twenty specimens each (3×4×45 mm) were fabricated, sintered, notched (n=360) and half of them heat treated before K$_{IC}$ measurements with 4-point-flexural-strength test. SEM images of the notches were recorded. Highest K$_{IC}$ was found for ZI followed by HT and FX. SEVNB resulted in significantly higher K$_{IC}$ than CNB. Heat treatment resulted in decrease for SEVNB and increase for CNB of K$_{IC}$ (except for FX). Groups tested using CNB showed higher reliability of values (Weibull modulus) than tested using SEVNB. SEM images present crack path and fracture surface. Different zirconia materials lead to different K$_{IC}$ values. The test method and a prior heat treatment showed an influence on the K$_{IC}$ values and their reliability.

Abstract

To determine the influence of the fracture toughness (K$_{IC}$) methods [single-edge-V-notch-beam (SEVNB) and chevron-notch-beam (CNB)] as well as an optional heat treatment on the K$_{IC}$ of three different zirconia generations (1st: ZI, 3rd: FX, 4th: HT). One hundred and twenty specimens each (3×4×45 mm) were fabricated, sintered, notched (n=360) and half of them heat treated before K$_{IC}$ measurements with 4-point-flexural-strength test. SEM images of the notches were recorded. Highest K$_{IC}$ was found for ZI followed by HT and FX. SEVNB resulted in significantly higher K$_{IC}$ than CNB. Heat treatment resulted in decrease for SEVNB and increase for CNB of K$_{IC}$ (except for FX). Groups tested using CNB showed higher reliability of values (Weibull modulus) than tested using SEVNB. SEM images present crack path and fracture surface. Different zirconia materials lead to different K$_{IC}$ values. The test method and a prior heat treatment showed an influence on the K$_{IC}$ values and their reliability.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Dental Medicine > Clinic of Conservative and Preventive Dentistry
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2 October 2019
Deposited On:30 Jan 2020 13:02
Last Modified:30 Jan 2020 13:02
Publisher:Japanese Society for Dental Materials and Devices
ISSN:0287-4547
OA Status:Green
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.4012/dmj.2018-361
PubMed ID:31434833

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