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Application of biologically-oriented dentin bonding principles to the use of endodontic irrigants.

AbstractPURPOSE:
To compare the removal of smear layer and the structure of the hybrid layer formed after the use of EDTA or MTAD solutions when used as a final flush.
METHODS:
Single-rooted extracted premolars (n=18) were collected and treated for root canal therapy using NaOCl irrigation followed by a final rinse of 17% EDTA, Biopure MTAD, or saline (negative control). The roots were obturated with gutta-percha and a hydrophilic HEMA-containing root canal sealer. The TEM specimens were impregnated with 50% silver nitrate to visualize sealing imperfections and nanoleakage. The structure of the coronal, middle and apical parts of root canal walls was examined using transmission electron microscopy.
RESULTS:
After NaOCl irrigation, a final rinse with BioPure MTAD or 17% EDTA completely removed the 2 microm-thick smear layer on mechanically instrumented root canal walls. The BioPure MTAD hybrid layer was thicker than the 17% EDTA hybrid layer. Both the BioPure MTAD and EDTA caused a collapse of the dentin matrix structure which impeded sealer infiltration and the formation of high quality hybrid layer bonding. The hybrid layers created in smear layer-covered dentin exhibited less potential for nanoleakage than the MTAD or EDTA hybrid layers.
AuthorsFranklin García-Godoy, Robert J Loushine, Anut Itthagarun, R Norman Weller, Peter E Murray, Albert J Feilzer, David H Pashley, Franklin R Tay
JournalAmerican journal of dentistry (Am J Dent) Vol. 18 Issue 4 Pg. 281-90 (Aug 2005) ISSN: 0894-8275 [Print] United States
PMID16296438 (Publication Type: Comparative Study, Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
Chemical References
  • Composite Resins
  • Dentin-Bonding Agents
  • EndoRez
  • Glass Ionomer Cements
  • MTAD (intracanal irrigant)
  • Polysorbates
  • Root Canal Filling Materials
  • Root Canal Irrigants
  • Xeno III
  • fuji TRIAGE pink capsule
  • Citric Acid
  • Collagen
  • Edetic Acid
  • Doxycycline
Topics
  • Bicuspid
  • Citric Acid (adverse effects)
  • Collagen (drug effects)
  • Composite Resins
  • Dental Leakage (etiology)
  • Dental Pulp Cavity
  • Dentin Permeability (drug effects)
  • Dentin-Bonding Agents
  • Desiccation
  • Doxycycline (adverse effects)
  • Edetic Acid (adverse effects)
  • Glass Ionomer Cements
  • Humans
  • Microscopy, Electron, Transmission
  • Polysorbates (adverse effects)
  • Root Canal Filling Materials
  • Root Canal Irrigants (adverse effects)
  • Root Canal Obturation (methods)
  • Root Canal Preparation (methods)
  • Smear Layer

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