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Dentin permeability: effects of endodontic procedures on root slabs
1Faculty of Dentistry, University of Manitoba, Winnipeg.
Journal of Endodontics
|September 1, 1990
Summary
K file instrumentation reduced radicular dentin permeability. Smear layer treatments with sodium hypochlorite (NaOCl) had no effect, citric acid increased permeability, while oxalate significantly reduced it by forming a precipitate.
Area of Science:
- Endodontics
- Dental Materials Science
- Biomaterials
Background:
- Human radicular dentin permeability is crucial for endodontic treatment success.
- The endodontic smear layer influences dentin permeability.
- Understanding smear layer effects and dissolution is vital for managing dentinal tubules.
Purpose of the Study:
- To quantify the hydraulic conductance of human radicular dentin.
- To evaluate the impact of K file instrumentation on dentin permeability.
- To assess the effect of sodium hypochlorite (NaOCl), citric acid, and monopotassium-monohydrogen oxalate on the endodontic smear layer and subsequent dentin permeability.
Main Methods:
- Hydraulic conductance measurements of human radicular dentin.
- Application of K files to simulate instrumentation.
- Treatment of the endodontic smear layer with 5% NaOCl, 50% citric acid, and 3% monopotassium-monohydrogen oxalate.
Main Results:
- K file instrumentation reduced dentin permeability by 25-49%.
- 5% NaOCl did not alter smear layer permeability.
- 50% citric acid significantly increased dentin permeability.
- Oxalate treatment markedly decreased dentin permeability due to crystalline precipitate formation.
Conclusions:
- Instrumentation alters radicular dentin permeability.
- Citric acid can enhance smear layer permeability, potentially increasing root canal system leakage.
- Oxalate effectively occludes dentinal tubules, significantly reducing root dentin permeability.