Cytotoxicity of endodontic materials over 6-weeks ex vivo

M. G. Brackett, A. Marshall, P. E. Lockwood, J. B. Lewis, R. L.W. Messer, S. Bouillaguet, J. C. Wataha

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Aim: To test the hypothesis that extending the time of a traditional ex vivo cytotoxicity test helps to identify trends in the behaviour of root core materials and sealers, which could ultimately aid in predicting their clinical safety and performance. Methodology: Endodontic sealers and core specimens were initially tested in direct contact with L929 fibroblasts for 72 h. Cell response was estimated by measuring cellular succinate dehydrogenase activity relative to Teflon controls. Cytotoxicity (% of more active cells) was reassessed after 1, 3, 4 and 6 weeks, with the specimens stored in a physiologically balanced salt-solution between tests. Results: Distinct trends in cytotoxicity among both core materials and sealers were observed over the 6-week test. Four of the six sealers and two of the three core materials showed cell viabilities of <30% of Teflon after 6 weeks (>70% cytotoxicity). Conclusions: The current results suggest that some endodontic materials have an elevated biological risk for extended intervals.

Original languageEnglish (US)
Pages (from-to)1072-1078
Number of pages7
JournalInternational Endodontic Journal
Issue number12
StatePublished - Dec 2008


  • Cell-culture
  • MTT
  • Periapical inflammation
  • Polymers
  • Pulpal infection
  • Succinate dehydrogenase

ASJC Scopus subject areas

  • Dentistry(all)


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