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Nanoindentation Characterization of the Hardness of Zirconia Dental Ceramics

Authors

  • Longquan Shao,

    1. Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, P. R. China
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  • Danyu Jiang,

    1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Shanghai 200050, P. R. China
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  • Jianghong Gong

    Corresponding author
    1. State Key Laboratory of New Ceramics and Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
    • State Key Laboratory of New Ceramics and Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, P.R. China
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Abstract

Hardness characterization is a key issue for the evaluation of the resistance to contact damage of dental materials. In this study, nanoindentation tests were conducted on four commercial zirconia dental ceramics. For each material, the measured nanohardness exhibits significant indentation size effect, i.e., the measured hardness decreases with increasing peak load. The so-called load-independent nanohardness was determined based on a second-order polynomial analysis of the variation of the contact depth with the peak load. Finally, a brief discussion was conducted on the reliability and the applicability of the determined load-independent nanohardness.

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