Abstract
Objectives
The purpose of this in vitro study was to investigate the effects of different air-abrasion pressures on flexural strength and shear bond strength of a translucent zirconia.
Materials and methods
The translucent zirconia surface was treated with 50 μm abrasive alumina particles at different pressure: 0.1 MPa; 0.2 MPa; 0.3 MPa; 0.4 MPa; 0.5 MPa; untreated specimens were used as control group (n = 33). For each group, three-point bending test was used to evaluate the flexural strength, and surface characterizations were analyzed. Following adhesive bonding and water storage for 24 h, specimens were subdivided into groups baseline and aged (5000 thermocycles). Then, shear bond strength was measured and failure mode was recorded. Statistical analysis was performed with one-way ANOVA and Tukey test (α = 0.05).
Results
Increasing air-abrasion pressure (0.3 MPa, 0.4 MPa, and 0.5 MPa) decreased the flexural strength. Higher air-abrasion pressure resulted in rougher zirconia surfaces and caused more microcracks. The highest shear bond strength was obtained for zirconia surfaces abraded at 0.2 MPa (15.88 ± 2.70 MPa) and 0.3 MPa (14.32 ± 1.12 MPa). Aging did not decrease the strength for all groups except control group (p < 0.001).
Conclusions
Air-abrasion with 50 μm abrasive alumina particles at 0.2 MPa could achieve good strength for translucent zirconia ceramics while maintaining adequate and durable bonding with resin cement.
Clinical relevance
A total of 0.2 MPa is recommended for air-abrasion procedure applied before a dental restoration fabricated with translucent zirconia is bonded to resin cement.
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Acknowledgments
We would like to thank Ms. Y.C. Zheng and UPCERA Inc. for supplying zirconia ceramics.
Funding
This study was funded by National Natural Science Foundation of China (grant number 81671032, JLW)
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Xinyan Zhang, Wei Liang, Feng Jiang, Zonghua Wang, Jiaxin Zhao, Chuanjian Zhou, and Junling Wu. The first draft of the manuscript was written by Xinyan Zhang and Wei Liang, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Xinyan Zhang and Wei Liang are Co-first author.
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Zhang, X., Liang, W., Jiang, F. et al. Effects of air-abrasion pressure on mechanical and bonding properties of translucent zirconia. Clin Oral Invest 25, 1979–1988 (2021). https://doi.org/10.1007/s00784-020-03506-y
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DOI: https://doi.org/10.1007/s00784-020-03506-y