期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 40, 期 13, 页码 4647-4654出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.04.016
关键词
Zirconia; Aging; Cycle fatigue
资金
- Northwestern Polytechnical University [G2018KY0303]
- Fundamental Research Funds for the Central Universities of China [3102017JC01003]
- Natural Science Foundation of Shaanxi Province [2020JQ-161]
- Social Development Grant of Shaanxi Province [2019SF-018]
The in vitro lifetime assessment of dental zirconia has been the focus of researchers. This work mainly studied the cyclic fatigue lifetime in saliva and aging lifetime of three commercial zirconia dental materials: two kinds of 3 mol%-yttria stabilized zirconia ST(super-translucence) and MT(medium-translucence), in which MT contains a small amount of alumina; a 5 mol%-yttria stabilized zirconia TT(tooth-translucency). ST and MT materials have higher initial mechanical strength (flexural strength) and initial crack propagation threshold than TT materials, thus they have longer cycle fatigue lifetime, but TT has best aging resistance(no aging) in existing aging procedures. MT has a higher initial mechanical strength and better aging resistance than ST samples due to the influence of alumina at grain boundary, but has lower strength reliability. Finally the service lifetime of the three materials was evaluated, and some guidance for their use is provided.
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