A scanning electron microscopic evaluation of different root canal irrigation regimens

Area of Science:

• Endodontics
• Dental Materials Science
• Microscopy

Background:

• The smear layer, a debris layer on instrumented root canal walls, can impede effective endodontic treatment.
• Efficient removal of the smear layer is crucial for successful root canal disinfection and sealing.

Purpose of the Study:

• To evaluate and compare the efficacy of different endodontic irrigants in eliminating the smear layer from root canal dentinal walls.
• To determine the optimal irrigant solution for comprehensive smear layer removal.

Main Methods:

• Scanning Electron Microscopy (SEM) was utilized to visualize the root canal surfaces.
• Photomicrographs of the middle and apical thirds of the root canals were analyzed using Fotoscore - v. 2.0 software.
• The effectiveness of 1% sodium hypochlorite (NaOCl), 1% NaOCl with 17% EDTAC, 2% chlorhexidine gel, and Ricinus communis gel was assessed.

Main Results:

• The mixture of 1% sodium hypochlorite and 17% EDTAC demonstrated complete removal of the smear layer from dentinal walls.
• 1% sodium hypochlorite alone, 2% chlorhexidine gel, and Ricinus communis gel showed limited efficacy in completely removing the smear layer.
• Significant differences in smear layer removal were observed between the tested irrigant groups.

Conclusions:

• A combination of sodium hypochlorite and EDTAC is highly effective for complete smear layer removal in endodontic treatment.
• Alternative irrigants like chlorhexidine gel and Ricinus communis gel are less effective for smear layer obliteration compared to the NaOCl-EDTAC mixture.
• Optimizing irrigant protocols is essential for enhancing the outcomes of endodontic procedures.