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

Abstract

PURPOSE:

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.

• Authors: Franklin García-Godoy, Robert J Loushine, Anut Itthagarun, R Norman Weller, Peter E Murray, Albert J Feilzer, David H Pashley, Franklin R Tay
• Journal: American journal of dentistry (Am J Dent) Vol. 18 Issue 4 Pg. 281-90 (Aug 2005) ISSN: 0894-8275 [Print] United States
• PMID: 16296438 (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