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| Effects of sandblasting on the flexural strength and fatigue property of the dental zirconia ceramics |
| WANG Liang1, GONG Xu2, WU Wei1, CHEN Jijun1, WU Bing3, LI Youhua1 |
| 1.Department of Stomatology, Ningbo NO.2 Hospital, Ningbo, 315010; 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; 3.State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases, Department of Laboratory Center, School of Stomatology, the Fourth Military Medical University, Xi’an, 710032 |
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| Cite this article: |
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WANG Liang,GONG Xu,WU Wei, et al. Effects of sandblasting on the flexural strength and fatigue property of the dental zirconia ceramics [J]. JOURNAL OF WEZHOU MEDICAL UNIVERSITY, 2017, 47(8): 585-589.
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Abstract Objective: To evaluate the effect of sandblasting on the flexural strength and fatigue property under cyclic loading of the dental zirconia ceramics. Methods: After polished, sixty bar-shaped specimens of HT were assigned to two groups (n=30) according to the random number table, one of which was sandblasted by alumina particles, the other was polished. The flexural strength of experimental group and control group was obtained from three-point flexural test, then examined by Weibull statistics and analyzed by the group t-test. The number of cycles to fracture was obtained from cyclic fatigue test. The fatigue crack growth rate curve based on Pairs law was used to describe the crack propagation. Results: The phase content of m-ZrO2 experimental group and control group were 11.1% and 6.24%. The flexural strength of experimental group and control group were 1 228.36±137.33 MPa and 1 200.55±114.74 MPa (P<0.05). The Weibull module of the two groups was 13.52 and 12.03. The stress corrosion cracking susceptive indexes were 35.80 and 32.87. The crack propagation occurred at the critical stress-intensity factor was as low as 51.9% and 50.9% of its fracture toughness. Conclusion: After dealing with the method described in this article, both the flexural strength and the crack growth resistance of the HT are increased.
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Received: 03 January 2017
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