Mechanistic aspects of in vitro fatigue-crack growth in dentin

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)1195-1204
Journal / PublicationBiomaterials
Volume26
Issue number10
Online published8 Sep 2004
Publication statusPublished - Apr 2005
Externally publishedYes

Abstract

Although the propagation of fatigue cracks has been recognized as a problem of clinical significance in dentin, there have been few fracture mechanics-based studies that have investigated this issue. In the present study, in vitro cyclic fatigue experiments were conducted over a range of cyclic frequencies (1-50 Hz) on elephant dentin in order to quantify fatigue-crack growth behavior from the perspective of understanding the mechanism of fatigue in dentin. Specifically, results obtained for crack extension rates along a direction parallel to the dentinal tubules were found to be well described by the stress-intensity range, ΔK, using a simple Paris power-law approach with exponents ranging from 12 to 32. Furthermore, a frequency dependence was observed for the crack-growth rates, with higher growth rates associated with lower frequencies. By using crack-growth experiments involving alternate cyclic and static loading, such fatigue-crack propagation was mechanistically determined to be the result of a "true" cyclic fatigue mechanism, and not simply a succession of static fracture events. Furthermore, based on the observed frequency dependence of fatigue-crack growth in dentin and observations of time-dependent crack blunting, a cyclic fatigue mechanism involving crack-tip blunting and re-sharpening is proposed. These results are deemed to be of importance for an improved understanding of fatigue-related failures in teeth. © 2004 Elsevier Ltd. All rights reserved.

Research Area(s)

  • Crack propagation, Dentin, Fatigue, Fracture mechanics

Citation Format(s)

Mechanistic aspects of in vitro fatigue-crack growth in dentin. / Kruzic, J.J.; Nalla, R.K.; Kinney, J.H.; Ritchie, R.O.

In: Biomaterials, Vol. 26, No. 10, 04.2005, p. 1195-1204.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal