A Comparative Evaluation of Different Irrigation Activation Techniques on Root Canal Cleanliness: A Scanning Electron...

Area of Science:

• Endodontics
• Biomaterials Science
• Microscopy

Background:

• Effective root canal cleaning is crucial for endodontic treatment success.
• Sodium hypochlorite (NaOCl) is a widely used irrigant, but its efficacy can be enhanced by activation methods.
• Inaccessible areas of the root canal system pose a challenge for debris removal.

Purpose of the Study:

• To compare the effectiveness of different irrigant activation techniques on root canal cleanliness.
• To evaluate ultrasonic, sonic, and laser activation of heated 3% sodium hypochlorite (NaOCl) against conventional needle irrigation.
• To assess root canal cleanliness using scanning electron microscopy.

Main Methods:

• Eighty-eight extracted mandibular premolars were prepared to a standardized length and canal size.
• Samples were divided into four groups: passive ultrasonic irrigation (PUI), sonic activation, diode laser activation, and conventional needle irrigation (CNI), all using 3% heated NaOCl.
• Root canal cleanliness was evaluated using scanning electron microscopy and graded for debris presence.

Main Results:

• Passive ultrasonic irrigation (PUI) and sonic activation demonstrated high cleanliness in the middle third of the root canal.
• Diode laser activation showed superior cleanliness in the apical third compared to the middle third.
• Conventional needle irrigation (CNI) exhibited the lowest cleaning efficiency in both root canal thirds.

Conclusions:

• Passive ultrasonic irrigation (PUI) with intracanal heating of 3% NaOCl is a recommended irrigant activation strategy.
• Diode laser activation of 3% NaOCl is also effective for cleaning inaccessible root canal areas.
• Both PUI and laser activation offer potential advantages for comprehensive root canal disinfection.