Is An Oxygen Inhibited Layer Required for Bonding of Resin-Coated Gutta-Percha to a Methacrylate-Based Root Canal Sealer?

Noriko Hiraishi, Robert J. Loushine, Michele Vano, Nicoletta Chieffi, R. Norman Weller, Marco Ferrari, David H. Pashley, Franklin R. Tay

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Removal of the oxygen inhibition layer from the surface of resin-coated gutta-percha cones during packaging has been hypothesized for their weak adhesion to a methacrylate-based root canal sealer, resulting in their frequent delamination from the sealer after root canal obturation. This study examined the feasibility of creating oxygen inhibition layers on resin-coated gutta-percha cones via the adjunctive application of a dual-cured dentin adhesive just before bonding. Composite cylinders were bonded with EndoREZ to flat, resin-coated gutta-percha disks and similar disks that were post-treated with Prime&Bond NT Dual Cure adhesive and stressed to failure using a modified microshear testing design. Although shear strengths for both groups were relatively low, a 5-fold increase in shear strength was observed after adhesive application, with complex interfacial failures instead of complete sealer delamination from the resin-coating. In-situ dentin adhesive application appears to have merits in enhancing the coupling of resin-coated gutta-percha to methacrylate sealers.

Original languageEnglish (US)
Pages (from-to)429-433
Number of pages5
JournalJournal of endodontics
Volume32
Issue number5
DOIs
StatePublished - May 2006

Keywords

  • FE-SEM
  • methacrylate sealer
  • microshear bond testing
  • oxygen inhibition layer
  • polybutadiene-diisocyanate-methacrylate
  • resin-coated gutta-percha

ASJC Scopus subject areas

  • Dentistry(all)

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