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Journal of Dental Research
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Biomaterials & Bioengineering

On the in vitro Fatigue Behavior of Human Dentin: Effect of Mean Stress

R.K. Nalla1, J.H. Kinney2, S.J. Marshall2 and R.O. Ritchie1,*

1 Materials Sciences Division, Lawrence Berkeley National Laboratory, and Department of Materials Science and Engineering, Hearst Mining Building, University of California, Berkeley, CA 94720; and
2 Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, CA 94143;

Correspondence: * corresponding author, RORitchie{at}lbl.gov

Human dentin is susceptible to failure under repetitive cyclic-fatigue loading. This investigation seeks to address the paucity of data that reliably quantify this phenomenon. Specifically, the effect of alternating vs. mean stresses, characterized by the stress- or load-ratio R (ratio of minimum-to-maximum stress), was investigated for three R values (–1, 0.1, and 0.5). Dentin was observed to be prone to fatigue failure under cyclic stresses, with susceptibility varying, depending upon the stress level. The "stress-life" (S/N) data obtained are discussed in the context of constant-life diagrams for fatigue failure. The results provide the first fatigue data for human dentin under tension-compression loading and serve to map out safe and unsafe regimes for failure over a wide range of in vitro fatigue lives (< 103 to > 106 cycles).

Key Words: dentin • fatigue • S/N behavior • stress-ratio • fractography • constant-life diagram

Journal of Dental Research, Vol. 83, No. 3, 211-215 (2004)
DOI: 10.1177/154405910408300305
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