Variability of physicochemical properties of an epoxy resin sealer taken from different parts of the same tube

J. V. Baldi, R. A. Bernardes, M. A.H. Duarte, R. Ordinola-Zapata, B. C. Cavenago, J. C.S. Moraes, I. G. de Moraes

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28 Scopus citations


Aim To analyse several physicochemical properties of AH Plus (Dentsply DeTrey, Konstanz, Germany), including setting time, flow, radiopacity and the degree of conversion (DC); and to correlate the results with the source of the material: from the beginning, middle or end of the tubes in which they were supplied. Methodology Three experimental groups were established for each property investigated. Group 1 corresponded to material taken from the beginning of tubes A and B; Group 2 corresponded to material taken from the middle of each tube; and group 3 corresponded to that from the end of each tube. The setting time, flow and radiopacity were studied according to American National Standards Institute/American Dental Association (ANSI/ADA) Specification 57. DC was determined from infrared spectra, which were recorded at 1-h intervals for the first 6h; then, at 2-h intervals for the next 14h; then, at 24 and 30h. Data were analysed statistically by analysis of variance (anova), Tukey-Kramer, Kruskal-Wallis and Dunn tests, with a significance level of 5%. Results Group 1 had a significantly longer setting time (2303±1058min) (P<0.05). Group 3 had the lowest flowability (30.0±0.7mm) and the highest radiopacity (14.85±1.8mm Al) (P<0.05). No differences were found for the DC test (P>0.05). Conclusion The results suggest that segregation occurs between the organic and inorganic components of AH Plus sealer, thereby changing the setting time, flow and radiopacity.

Original languageEnglish (US)
Pages (from-to)915-920
Number of pages6
JournalInternational Endodontic Journal
Issue number10
StatePublished - Oct 2012
Externally publishedYes


  • AH Plus
  • Degree of conversion
  • Physicochemical properties
  • Radiopacity
  • Root canal sealer


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