Crack growth rates in lithium disilicates with bulk (mis)alignment of the Li2Si2O5 phase in the [001] direction
Kirsten J, Belli R, Wendler M, Petschelt A, Hurle K, Lohbauer U (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 532
Article Number: 119877
DOI: 10.1016/j.jnoncrysol.2019.119877
Abstract
Processing-induced alignment of Li2Si2O5 crystals in biomedical lithium disilicate glass-ceramics have been shown to increase the monotonic resistance to fracture and better simulate the mechanical behavior of natural dental tissues. The (mis)orientation of the [001] direction in the Li2Si2O5 crystal phase relative to the crack growth plane was induced by injection-molding of a high aspect ratio composition in order to determine the effect of crystal alignment. The role of particulate geometry was assessed by comparing two compositions having randomly oriented Li2Si2O5 crystals of similar phase fraction but dissimilar crystal aspect ratios. Static and cyclic fatigue experiments in varying frequencies and R-ratios were conducted to clarify the degradation of crack bridging mechanisms induced by the crystal phase during repetitive opening and closure of the crack faces. Both crystal alignment and aspect ratio showed to play important roles in affecting the subcritical crack growth resistance the lifetime of lithium disilicate biomedical components.
Authors with CRIS profile
Julia Kirsten
Lehrstuhl für Zahn-,Mund- und Kieferheilkunde, insbesondere Zahnerhaltung, Parodontologie und Kinderzahnheilkunde
Renan Belli
Department of Operative Dentistry and Periodontology
Anselm Petschelt
Lehrstuhl für Zahn-,Mund- und Kieferheilkunde, insbesondere Zahnerhaltung, Parodontologie und Kinderzahnheilkunde
Katrin Hurle
Lehrstuhl für Mineralogie
Ulrich Lohbauer
Medizinische Fakultät
Involved external institutions
Chile (CL)How to cite
APA:
Kirsten, J., Belli, R., Wendler, M., Petschelt, A., Hurle, K., & Lohbauer, U. (2020). Crack growth rates in lithium disilicates with bulk (mis)alignment of the Li2Si2O5 phase in the [001] direction. Journal of Non-Crystalline Solids, 532. https://doi.org/10.1016/j.jnoncrysol.2019.119877
MLA:
Kirsten, Julia, et al. "Crack growth rates in lithium disilicates with bulk (mis)alignment of the Li2Si2O5 phase in the [001] direction." Journal of Non-Crystalline Solids 532 (2020).
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