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Relationship between endodontic preparations and human dentin permeability measured in situ
P Guignes1, J Faure, A Maurette
1Department of Restorative Dentistry and Endodontics, Faculty of Dental Surgery, Toulouse, France.
Journal of Endodontics
|February 1, 1996
Summary
Endodontic preparation techniques significantly alter radicular dentin permeability. Smear layer presence and dentin thickness inversely correlate with permeability changes, with EDTA and ultrasonics notably increasing hydraulic conductance.
Area of Science:
- Endodontics
- Dental Materials Science
- Biomaterials
Background:
- Endodontic procedures aim to clean and shape the root canal system.
- These preparations can affect the physical properties of dentin, including its permeability.
- Understanding dentin permeability is crucial for preventing bacterial leakage and ensuring treatment success.
Purpose of the Study:
- To evaluate changes in radicular dentin hydraulic conductance following different endodontic preparation techniques.
- To correlate these permeability changes with the presence of smear layer and dentin thickness.
- To compare the effects of manual instrumentation, ultrasonic preparation, and chemical agents (NaOCl and EDTA).
Main Methods:
- Hydraulic conductance was measured in situ on radicular dentin specimens.
- Three preparation techniques were employed: manual K+H files, ultrasonic preparation, and manual preparation with NaOCl and EDTA.
- Scanning electron microscopy (SEM) was used to analyze the canal wall surfaces for smear layer and debris.
Main Results:
- An inverse relationship was observed between dentin permeability variations and the presence of smear layer.
- Dentin thickness was found to be as influential on radicular permeability as the smear layer.
- EDTA application resulted in a significant increase in radicular permeability, while ultrasonic preparation showed a similar but less pronounced effect.
Conclusions:
- Endodontic preparation methods significantly impact radicular dentin permeability.
- The smear layer plays a role in modulating permeability, but its effect varies with the preparation technique.
- Dentin thickness is a critical factor influencing permeability, alongside the smear layer. EDTA and ultrasonic activation markedly increase hydraulic conductance.