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Strength degradation and lifetime prediction of dental zirconia ceramics under cyclic normal loading

Issue title: Frontiers in Biomedical Engineering and Biotechnology – Proceedings of the 4th International Conference on Biomedical Engineering and Biotechnology, 18–21 August 2015, Shanghai, China

Guest editors: Feng Liu, Dong-Hoon Lee, Ricardo Lagoa and Sandeep Kumar

Article type: Research Article

Authors: Li, Wanzhonga; * | Xu, Yingqianga | He, Huimingb | Zhao, Haidanc | Sun, Jiana | Hou, Yuea

Affiliations: [a] School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi, P.R. China | [b] School of Stomatology, The Fourth Military Medical University, Xi’an, Shaanxi, P.R. China | [c] The 309th Hospital of Chinese People’s Liberation Army, Beijing, P.R. China

Correspondence: [*] Address for correspondence: Wanzhong Li, PO Box 324, 127 West Youyi Road, Xi’an Shaanxi, 710072, P.R. China. Tel.: +86 15691821236; Fax: +86 29 88493928; E-mail: imposing@yeah.net.

Keywords: Strength degradation, lifetime prediction, damage degree, flexure strength, normal cyclic load

DOI: 10.3233/BME-151298

Journal: Bio-Medical Materials and Engineering, vol. 26, no. s1, pp. S129-S137, 2015

Published: 2015
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Clinical cases show that zirconia restoration could happen fracture by accident under overloading after using a period of time. The purpose of this study is to research mechanical behavior and predict lifetime of dental zirconia ceramics under cyclic normal contact loading with experiments. Cyclic normal contact loading test and three point bending test are carried on specimens made of two brands of dental zirconia ceramic to obtain flexure strength and damage degree after different number of loading cycles. By means of damage mechanics model, damage degree under different number of contact loading cycles are calculated according to flexure strength, and verified by SEM photographs of cross section morphology of zirconia ceramics specimen phenomenologically. Relation curve of damage degree and number of cycles is fitted by polynomial fitting, then the number of loading cycles can be concluded when the specimen is complete damage. Strength degradation of two brands dental zirconia ceramics are researched in vitro, and prediction method of contact fatigue lifetime is established.

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