Bonding of Self-adhesive (Self-etching) Root Canal Sealers to Radicular Dentin

Brian R. Babb, Robert J. Loushine, Thomas E. Bryan, Jason M. Ames, Mark Causey, Jongryul Kim, Young Kyung Kim, R. Norman Weller, David Henry Pashley, Franklin R. Tay

Research output: Contribution to journalArticlepeer-review

85 Scopus citations


The latest generation of methacrylate resin-based sealers has eliminated the use of separate self-etching primers by incorporating acidic resin monomers in the sealers to render them self-adhesive to dentin. This study examined the adhesive strengths, interfacial ultrastructure, and tracer penetration of a nonetching (EndoREZ; Ultradent, South Jordan, UT) and two self-adhesive methacrylate resin-based sealers (MetaSEAL; Parkell, Farmington, NY, and RealSeal SE; SybronEndo, Orange, CA) when they were applied to radicular dentin following the manufacturers' recommended use of EDTA as the active final rinse. A modified push-out testing design was used to evaluate the dislodgement of core-free sealers. The mixed sealers were placed in dimensionally identical, artificially created canal spaces prepared in the coronal, middle, and apical thirds of radicular dentin. After setting, each sealer-filled cavity was subjected to compressive loading until failure. Additional specimens were prepared for transmission electron microscopy to examine the ultrastructure and nanoleakage within the sealer-radicular dentin interface. The two self-adhesive sealers MetaSEAL and RealSeal SE exhibited higher push-out strengths than the nonetching sealer EndoREZ when EDTA was used as the active final rinse. All three sealers showed a 1- to 1.5-μm thick zone of partially demineralized dentin, with the EDTA dentin demineralization effect masking the true self-etching potential of MetaSEAL and RealSeal SE. The true self-etching potential of self-adhesive sealers is a clinically important attribute that should be further investigated. Incomplete smear layer removal from the apical third of instrumented canal walls may jeopardize the performance of self-adhesive sealers should they fail to self-etch without the adjunctive use of calcium chelating irrigants.

Original languageEnglish (US)
Pages (from-to)578-582
Number of pages5
JournalJournal of Endodontics
Issue number4
StatePublished - Apr 1 2009


  • Adhesion
  • EDTA
  • dislocation resistance
  • hybrid layer
  • nanoleakage
  • push-out test
  • root canal sealers

ASJC Scopus subject areas

  • Dentistry(all)


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