Which is commonly used for irrigation during endodontic debridement?

Sodium hypochlorite is commonly used for irrigation during endodontic debridement because it serves multiple important functions in root canal treatment. As a strong antimicrobial agent, sodium hypochlorite effectively helps to eliminate bacteria and necrotic tissue within the root canal system, which is crucial for preventing infection and promoting healing. Additionally, it has the ability to dissolve organic tissue, making it particularly beneficial in cleaning the complex anatomy of the root canals.

The other options, while they may have some utility in dental procedures, do not provide the same level of efficacy for the specific needs of endodontic irrigation. Sodium chloride and sterile saline solution can help in rinsing but lack the bactericidal properties and tissue-dissolving capabilities of sodium hypochlorite. Sterile water is also ineffective as a cleaning and debridement agent in this context, as it does not have antimicrobial properties.

Thus, sodium hypochlorite stands out as the preferred irrigant in endodontics due to its unique combination of cleaning, disinfecting, and tissue-dissolving properties.