Root canal debridement efficacy of different final irrigation protocols

Area of Science:

• Endodontics
• Dental Materials Science

Background:

• Effective cleaning and disinfection of root canal systems are crucial for successful endodontic treatment.
• Smear layer and debris removal are challenging, especially in curved canals, potentially impacting treatment outcomes.

Purpose of the Study:

• To compare the efficacy of four different root canal irrigation protocols in removing smear layer, debris, and soft tissue remnants from curved root canals.
• To evaluate the effectiveness of CanalBrush, passive ultrasonic irrigation, manual agitation, and alternating hydrogen peroxide with sodium hypochlorite.

Main Methods:

• 107 human molars underwent root canal instrumentation.
• Four irrigation groups were established: manual agitation, CanalBrush, alternating 3% hydrogen peroxide (H2O2) with 1% sodium hypochlorite (NaOCl), and passive ultrasonic irrigation (PUI).
• Smear layer, debris, and pulpal tissue removal were assessed using scanning electron microscopy and histological staining.

Main Results:

• CanalBrush and PUI demonstrated significantly better smear layer and debris removal compared to manual agitation and alternating H2O2 with NaOCl (P < 0.05).
• The H2O2/NaOCl protocol was more effective in removing apical pulpal tissue remnants than manual agitation (P = 0.009) and PUI (P = 0.01).

Conclusions:

• CanalBrush offers comparable smear layer and debris removal efficacy to PUI.
• Alternating H2O2 with NaOCl shows promise for soft tissue removal in complex root canal anatomy.
• Further research is needed to optimize irrigant volume and consider root canal system configuration.