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Does a final rinse to remove smear layer interfere on dentin permeability of root canals?
Isabel Mello1, Jeffrey Coil, João Humberto Antoniazzi
1Faculty of Dentistry, University of Manitoba, Winnipeg, Manitoba, Canada. imello2@hotmail.com
Summary
The study found no direct correlation between dentin permeability and smear layer removal when using different final irrigating solutions like EDTA-T and MTAD. Analyzing both factors on the same tooth specimens proved feasible.
Area of Science:
- Endodontics
- Dental Materials Science
Background:
- Effective smear layer removal and maintaining dentin integrity are critical in endodontic treatment.
- Various final irrigating solutions are used, each with potential effects on dentinal tubules and smear layer.
Purpose of the Study:
- To evaluate the impact of different final irrigating solutions on dentin permeability and smear layer removal.
- To determine if there is a correlation between dentin permeability and smear layer removal using the same specimens.
Main Methods:
- Forty human teeth were irrigated with 1% NaOCl, 17% EDTA, 17% EDTA-T, or Biopure MTAD.
- Dentin permeability was assessed using methylene blue dye penetration.
- Smear layer removal was evaluated using Scanning Electron Microscopy (SEM).
Main Results:
- EDTA-T significantly reduced dentin permeability in the apical third.
- Decalcifying agents (EDTA, EDTA-T, MTAD) effectively removed the smear layer, unlike NaOCl.
- The EDTA group showed increased smear layer in the apical third.
- No significant correlation was found between dentin permeability and smear layer removal.
Conclusions:
- Dentin permeability and smear layer removal are not consistently correlated.
- The choice of final irrigating solution influences both dentin permeability and smear layer removal independently.
- Assessing dentin permeability and smear layer removal on the same specimens is a viable methodology.