Journal Article

Comparative study of flexural strength test methods on CAD/CAM Y-TZP dental ceramics

Yongxiang Xu, Jianmin Han, Hong Lin and Linan An

in Regenerative Biomaterials

Published on behalf of Chinese Society for Biomaterials

Volume 2, issue 4, pages 239-244
Published in print December 2015 | ISSN: 2056-3418
Published online October 2015 | e-ISSN: 2056-3426 | DOI:

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  • Reproductive Medicine
  • Biological Engineering
  • Materials Science


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Clinically, fractures are the main cause of computer-aided design and computer-aided manufacturing (CAD/CAM) 3 mol%-yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) all-ceramic dental restorations failure because of repetitive occlusal loading. The goal of this work is to study the effect of test methods and specimen’s size on the flexural strength of five ceramic products. Both bi-axial flexure test (BI) and uni-axial flexure tests (UNI), including three-point flexure test (3PF) and four-point flexure test (4PF), are used in this study. For all five products, the flexural strength is as follows: BI > 3PF > 4PF. Furthermore, specimens with smaller size (3PF-s) have higher values than the bigger ones (3PF). The difference between BI and UNI resulted from the edge flaws in ceramic specimens. The relationship between different UNI (including 3PF-s, 3PF and 4PF) can be explained according to Weibull statistical fracture theory. BI is recommended to evaluate the flexural strength of CAD/CAM Y-TZP dental ceramics.

Keywords: CAD/CAM Y-TZP dental ceramics; flexural strength; test methods

Journal Article.  3035 words.  Illustrated.

Subjects: Reproductive Medicine ; Biological Engineering ; Materials Science

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