Journal
DENTAL MATERIALS
Volume 26, Issue 2, Pages 135-147Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dental.2009.09.006
Keywords
Weibull; Review; Weibull standards; Flaw population; Extreme value distribution; Strength distribution; Characteristic strength; Strength comparison; Equivalent volume; Equivalent area; Alumina; Zirconia; Porcelain; Weibull modulus; Strength scaling; Maximum likelihood; Linear regression
Funding
- NIDCR NIH HHS [R01 DE017983-02, R01 DE017983] Funding Source: Medline
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Objectives. To review the history, theory and current applications of Weibull analyses sufficient to make informed decisions regarding practical use of the analysis in dental material strength testing. Data. References are made to examples in the engineering and dental literature, but this paper also includes illustrative analyses of Weibull plots, fractographic interpretations, and Weibull distribution parameters obtained for a dense alumina, two feldspathic porcelains, and a zirconia. Sources. Informational sources include Weibull's original articles, later articles specific to applications and theoretical foundations of Weibull analysis, texts on statistics and fracture mechanics and the international standards literature. Study selection. The chosen Weibull analyses are used to illustrate technique, the importance of flaw size distributions, physical meaning of Weibull parameters and concepts of equivalent volumes to compare measured strengths obtained from different test configurations. Conclusions. Weibull analysis has a strong theoretical basis and can be of particular value in dental applications, primarily because of test specimen size limitations and the use of different test configurations. Also endemic to dental materials, however, is increased difficulty in satisfying application requirements, such as confirming fracture origin type and diligence in obtaining quality strength data. (C) 2009 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
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