Weibull models of fracture strengths and fatigue behavior of dental resins in flexure and shear

George R. Baran, John I. McCool, David Paul, Ken Boberick, Stephanie Wunder

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


In estimating lifetimes of dental restorative materials, it is useful to have available data on the fatigue behavior of these materials. Current efforts at estimation include several untested assumptions related to the equivalence of flaw distributions sampled by shear, tensile, and compressive stresses. Environmental influences on material properties are not accounted for, and it is unclear if fatigue limits exist. In this study, the shear and flexural strengths of three resins used as matrices in dental restorative composite materials were characterized by Weibull parameters. It was found that shear strengths were lower than flexural strengths, liquid sorption had a profound effect on characteristic strengths, and the Weibull shape parameter obtained from shear data differed for some materials from that obtained in flexure. In shear and flexural fatigue, a power law relationship applied for up to 250 000 cycles; no fatigue limits were found, and the data thus imply only one flaw population is responsible for failure. Again, liquid sorption adversely affected strength levels in most materials (decreasing shear strengths and flexural strengths by factors of 2-3) and to a greater extent than did the degree of cure or material chemistry.

Original languageEnglish (US)
Pages (from-to)226-233
Number of pages8
JournalJournal of Biomedical Materials Research
Issue number3
StatePublished - Sep 1998

All Science Journal Classification (ASJC) codes

  • Biomaterials
  • Biomedical Engineering


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