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The breakdown of the Weibull behavior in dental zirconias
Author(s) -
Belli Renan,
Lohbauer Ulrich
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17886
Subject(s) - weibull distribution , materials science , brittleness , cubic zirconia , composite material , weibull modulus , aggregate (composite) , flexural strength , range (aeronautics) , particle (ecology) , forensic engineering , ceramic , mathematics , statistics , oceanography , engineering , geology
Here we attend to the controversy of the use of Weibull statistics for describing the strength distribution of dental brittle materials. Our approach is purely experimental by means of testing for the strength size effect, a requirement for Weibull materials. Zirconia materials of five important dental manufacturers were selected, each represented by two compositions, being one a 3 mol% Y 2 O 3 ‐stabilized zirconia, and the other being a “translucent” zirconia with 4 or 5 mol% stabilizer content. Specimens of increasing sizes were fractured, whether by using a biaxial flexure test in plates or a uniaxial bending test in beams, thereby sampling different ranges of effective surfaces and volumes. A systematic deviation from the Weibull behavior over the range of 1–40 mm 2 effective surface was demonstrated, regardless of manufacturer and Y 2 O 3 content in the powder. Extensive testing using a wider range of specimen sizes narrowed down the threshold for the breakdown of the defect size distribution from the parent population to be located between 10 and 20 mm 2 effective surface. A comparable behavior was confirmed for the partly sintered white‐bodies, with similar defect morphology to the fully sintered analogs, indicating a defect size distribution stemming from the pressing steps of manufacture. The defect shape related to open particle aggregate junctions, pointing to an association of their size distribution to that of the distribution of aggregate sizes in the source powders.

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