Journal
JOURNAL OF DENTAL RESEARCH
Volume 83, Issue 3, Pages 211-215Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/154405910408300305
Keywords
dentin; fatigue; S/N behavior; stress-ratio; fractography; constant-life diagram
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Funding
- NIDCR NIH HHS [P01 DE 09859] Funding Source: Medline
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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 (< 10(3) to > 10(6) cycles).
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