RT Journal Article A1 Lixian ZHANG,Longquan SHAO,Lei LI,Danyu JIANG; AD the First Hospital of Yunnan Province, 650000, 中国 ; Southern Medical University, 510515, 中国 ; Shanghai Institute of Ceramics, 200050, 中国 ; Shanghai Institute of Ceramics, 200050, 中国 T1 An abnormal displacement change during holding period in nanoindentation tests on zirconia dental ceramic YR 2016 IS 2 vo 5 OP 153-OP 158 K1 zirconia;nanoindentation;displacement;elastic recovery AB An abnormal displacement change observed during the holding period in nanoindentation tests on a zirconia dental ceramic was reported in this paper. It was found that, at the initial stage of the holding period, the measured displacement versus time curves were similar in shape with the typical indentation creep curve reported in previous studies. As the holding lasted for long time, however, an evident reduction in displacement was observed for tests with high loading rate, implying that another unknown process, which might result in a decrease in displacement, would co-exist with creep during holding period. Elastic recovery was suggested to be one of the possible sources for such a displacement reduction. An empirical method was also proposed to eliminate the effect of this displacement reduction on the determination of hardness and Young’s modulus. SN 2226-4108 LA EN