title: Comparative study of flexural strength test methods on CAD/CAM Y-TZP dental ceramics.
abstract: 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.
authors.affiliation: Department of Dental Materials, Peking University School and Hospital of Stomatology, Beijing 100081, China;; National Engineering Laboratory for Digital and Material Technology of Stomatology, Peking University School and Hospital of Stomatology, Beijing 100081, China;
authors.forename: Yongxiang
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Department of Dental Materials, Peking University School and Hospital of Stomatology, Beijing 100081, China;; National Engineering Laboratory for Digital and Material Technology of Stomatology, Peking University School and Hospital of Stomatology, Beijing 100081, China;
authors.forename: Jianmin
authors.initials: J
authors.lastname: Han
authors.affiliation: Department of Dental Materials, Peking University School and Hospital of Stomatology, Beijing 100081, China;; National Engineering Laboratory for Digital and Material Technology of Stomatology, Peking University School and Hospital of Stomatology, Beijing 100081, China;
authors.forename: Hong
authors.initials: H
authors.lastname: Lin
authors.affiliation: Department of Materials Science and Engineering, Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, FL 32816, USA.
authors.forename: Linan
authors.initials: L
authors.lastname: An
keywords: CAD/CAM Y-TZP dental ceramics; flexural strength; test methods
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