In endodontics, what is the main function of EDTA?

• A. Disinfection of the root canal
• B. Decalcification of dentine
• C. Reshaping the canal
• D. Sealing the root canal

Answer: (B)

In endodontics, EDTA (Ethylenediaminetetraacetic acid) is primarily used for its property of decalcifying dentin. This action helps to remove the inorganic components of the dentin, which aids in the cleaning and preparation of the root canal system. By chelating calcium ions, EDTA effectively softens the dentin, making it easier to shape and clean the canal, especially when working with complex anatomical structures.

The decalcification process is crucial for ensuring adequate debridement of the root canal and for enhancing the effectiveness of subsequent disinfection measures. This property is particularly beneficial when preparing the canal for filling, as it allows for better adaptation of materials and improved sealing of the root canal system. Thus, the main function of EDTA in endodontics is its role in decalcifying dentin, facilitating the endodontic treatment process.