Resistance-curve envelopes for dental lithium disilicate glass-ceramics

Lubauer J, Ast J, Göken M, Merle B, Lohbauer U, Belli R (2022)

Publication Type: Journal article

Publication year: 2022


DOI: 10.1016/j.jeurceramsoc.2022.01.013


Recent investigations on the mechanics of dental lithium disilicates have gathered mounting evidences of a probable R-curve behavior. Here we use an indirect approach to obtain the contours of the R-curve using the relationship between strength and initial crack size obtained from quasi-static fracture toughness tests. The tangent condition formed by the multiple K I,appl (ai,j) curves give a smoothened polygonal envelope for the R-curves. The R-curves obtained this way were extended toward an initial value at the onset of stable crack extension, obtained hereusing a microcantilever specimen featuring a sharp notch produced by focused-ion-beam milling. The presence of an R-curve effect was confirmed for the three evaluated lithium disilicates, being more pronounced for the injection-molded material having an oriented elongated Li2Si2O5 microstructural architecture, with crystal fraction playing an important role for low-aspect ratio randomly-oriented microstructures.

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How to cite


Lubauer, J., Ast, J., Göken, M., Merle, B., Lohbauer, U., & Belli, R. (2022). Resistance-curve envelopes for dental lithium disilicate glass-ceramics. Journal of the European Ceramic Society.


Lubauer, Julia, et al. "Resistance-curve envelopes for dental lithium disilicate glass-ceramics." Journal of the European Ceramic Society (2022).

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