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| The effect of high cycle dynamic loading on the bending strength and its reliability of dental zirconia ceramics |
| LU Ying1, GONG Xu2, WANG Siyun1 |
1.Department of Stomatology, Affiliated Hospital of Shaoxing University, Shaoxing Municipal Hospital, Shaoxing 312000, China; 2.State Key Laboratory of Military
Stomatology & National Clinical Research Center for Oral Diseases, Department of Dental Materials, School of Stomatology, the Fourth Military Medical University, Xi’an 710032, China |
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| Cite this article: |
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LU Ying,GONG Xu,WANG Siyun. The effect of high cycle dynamic loading on the bending strength and its reliability of dental zirconia ceramics[J]. JOURNAL OF WEZHOU MEDICAL UNIVERSITY, 2022, 52(11): 909-913.
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Abstract Objective: To investigate the effect of high cycle dynamic loading on the bending strength and its reliability of dental zirconia ceramics. Methods: A total of 30 dental zirconia ceramic specimens were randomly divided into 2 groups (n=15), with the experimental group subjected to dynamic cyclic loading for 3 million times and the control group not treated. The three-point bending strength of all the samples was tested and the results were studied by Weibull and statistical analysis. The fractured surface morphology of 2 specimens randomly selected from each group was observed under the scanning electron microscope. Results: The bending strength of the control and the experimental group was (1 051.3±98.8) MPa and (890.2±128.2) MPa respectively (P<0.05), with the control group was significantly higher than the experimental group. The Weibull modulus of bending strength was 12.29 and 7.77 respectively, and the characteristic strength was 1 095.4 MPa and 946.5 MPa
respectively. A large number of closed holes were found in the fracture surface of the experimental group, which confirmed the crack propagation in the specimens. Conclusion: Fatigue cracks can be produced by high cyclic dynamic loads in dental zirconia ceramics, which reduces the bending strength and reliability while increases
their fracture risk.
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Received: 25 June 2022
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