A Comparison of Cohesive Strength and Stiffness of Resilon and Gutta-Percha

Chad Williams, Robert J. Loushine, R. Norman Weller, David H. Pashley, Franklin R. Tay

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


The purpose of this study was to compare the cohesive strength and stiffness of Resilon and gutta-percha under dry conditions and after 1 month of water storage to determine if they are stiff enough to reinforce roots. Dog-bone shaped specimens were created and pulled to failure at 3 mm/min in a Vitrodyne universal tester. The apparent modulus of elasticity, percent elongation, and yield stress were measured. Cohesive strength was defined as the yield stress. The data were analyzed using a two-way ANOVA for each outcome (α = 0.05). The results of this study show that the cohesive strength (that is the tensile stress when they begin to flow or break) and modulus of elasticity (or stiffness) of gutta-percha and Resilon are relatively low. Although the results showed statistically significant differences between the physical properties of gutta-percha and Resilon under varied conditions, these differences were not clinically significant. In conclusion, the stiffness of Resilon and gutta-percha is too low to reinforce roots after root canal therapy.

Original languageEnglish (US)
Pages (from-to)553-555
Number of pages3
JournalJournal of endodontics
Issue number6
StatePublished - Jun 2006
Externally publishedYes


  • Cohesive strength
  • Epiphany
  • Resilon
  • modulus of elasticity

ASJC Scopus subject areas

  • Dentistry(all)


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