Ethylene-diamene tetracetic acid (EDTA) solution
Endodontic instrumentation creates a smear layer on the root canal walls, particularly when using nickel-titanium rotary instruments. This smear layer occludes the dentinal tubules, and may protect microorganisms from the effects of the sodium hypochlorite irrigation. Flushing the canal with EDTA solution (Fig. 7) periodically during instrumentation removes the smear layer, and enables more effective cleansing. The final irrigation should always be with sodium hypochlorite.
Endodontic instrumentation creates a smear layer on the root canal walls, particularly when using nickel-titanium rotary instruments. This smear layer occludes the dentinal tubules, and may protect microorganisms from the effects of the sodium hypochlorite irrigation. Flushing the canal with EDTA solution (Fig. 7) periodically during instrumentation removes the smear layer, and enables more effective cleansing. The final irrigation should always be with sodium hypochlorite.