Resistance of a 4-META-Containing, Methacrylate-based Sealer to Dislocation in Root Canals

Matthew S. Lawson, Bethany Loushine, Sui Mai, R. Norman Weller, David H. Pashley, Franklin R. Tay, Robert J. Loushine

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


The dislocation resistance of root fillings created with MetaSEAL, a self-adhesive 4-META-containing methacrylate resin-based sealer, was evaluated. Forty-six incisors were cleaned and shaped using NaOCl and EDTA as irrigants. They were filled with gutta-percha/MetaSEAL or gutta-percha/AH Plus sealer using either a single-cone technique or warm vertical compaction (n = 10). The roots were sectioned at the coronal and middle thirds to obtain thin slices, which were subjected to compressive loading to displace the set sealer/filling toward the coronal side of the slice. The remaining six teeth were filled with gutta-percha/MetaSEAL and cryofractured for scanning electron microscopic examination. The push-out strength of AH Plus was significantly higher than MetaSEAL irrespective of filling techniques (p < 0.05). A minimal hybrid layer was seen in radicular dentin, and resin tags were inconsistently identified from canal walls in the MetaSEAL-filled canals. The lower dislocation resistance in MetaSEAL-filled canals challenges the use of a self-adhesive bonding mechanism to create continuous bonds inside root canals.

Original languageEnglish (US)
Pages (from-to)833-837
Number of pages5
JournalJournal of endodontics
Issue number7
StatePublished - Jul 2008


  • 4-META
  • AH Plus
  • dislocation resistance
  • root canal sealer
  • thin-slice push-out test

ASJC Scopus subject areas

  • Dentistry(all)


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