Effect of Speed Sintering System on Mechanical Properties of Zirconia

doi:10.13701/j.cnki.kqyxyj.2021.04.014

Abstract

Abstract: Objective: To investigate the changes of density, apparent porosity, Vickers hardness, flexural strength, and other performance of specimens at speed sintering conditions which met the requirements of dental zirconia mechanical properties under conventional sintering conditions. Methods: Specimens were prepared by the process of second sinter. Firstly, 22 specimens were prepared by the process of pre-sinter, of which 8 were long strips and 14 were discs. The pre-sintered blanks were divided equally into two groups for final sintering: the speed sintering group (SS) and the conventional sintering group (CS). The effects of two sintering system on the density, apparent porosity, Vickers hardness, flexural strength, and surface morphology of the self-made specimens were compared by related analysis. Results: The density of self-made zirconia prepared by speed sintering was similar to that prepared by conventional sintering method (P>0.05). The Vickers hardness and apparent porosity of speed sintering were higher than those of conventional sintering group (P<0.05), and the flexural strength was slightly lower than that of conventional sintering group (P<0.05). The crystal grains of the specimens prepared by speed sintering were smaller and denser, but the arrangement of the crystal grains was not well-distributed compared with the conventional sintering group, and the pores were visible. Conclusion: The speed sintering system will have great developmental potential in the future. However, the preparation has higher requirements.

Key words: speed sintering, zirconia, mechanical properties, crystal structure

LI Yifan, ZHOU Zhiwei, WANG Zhenhua. Effect of Speed Sintering System on Mechanical Properties of Zirconia[J]. Journal of Oral Science Research, 2021, 37(4): 339-343.

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