The Fracture Resistance of Full Contour Monolithic-Zirconia Dental Crowns from Cyclic Loading: A Function of Lifetime Extension of Dental Restorations
DOI:
https://doi.org/10.55549/ephels.70Abstract
An ex-vivo study aimed to investigate the fracture resistance of monolith- single layer zirconia of 1.5 mm thickness for dental molar crowns concerning simulating failure behavior under simulated cyclic loading with an extended lifetime of up to 5 million cycles. Sixteen molar crowns were scanned after preparation through computer-aided manufacturing (CAD/CAM) technology to recreate the zirconia crowns, which have a uniform occlusal surface thickness of 1.5 mm. All the samples went through thermal aging by putting them through 6000 thermo-cycles for 3 minutes with the use of distilled water at a temperature range between 5 ˚C and 55 ˚C. All samples were placed under cyclic fatigue loading using the SD Mechatronik chewing simulator and afterward subjected to two-dimensional movements for almost five million cycles. Tests were carried out in distilled water at room temperature. The sample was observed, tested, and photographed every five hundred thousand cycles. The surface cracks were observed within the vicinity of the contact area only and extended with increasing cycles. Minor wear depth was observed in the crowns relative to the damage observed in the Ni‑Cr alloy steel flat indenter. No chipping or complete failure was observed in all tested samples which suggested that full-contour zirconia crowns are good for extending the long life service of dental restorations.
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Published
2023-07-01
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Qasim, T. (2023). The Fracture Resistance of Full Contour Monolithic-Zirconia Dental Crowns from Cyclic Loading: A Function of Lifetime Extension of Dental Restorations. The Eurasia Proceedings of Health, Environment and Life Sciences, 9, 24–27. https://doi.org/10.55549/ephels.70
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