Which instrument is used to gradually enlarge the anatomical diameter of the root canal?

The endodontic file is specifically designed for the purpose of cleaning and shaping the root canal system during endodontic treatment. Its tapered design allows it to gradually enlarge the anatomical diameter of the root canal while also aiding in the removal of debris, necrotic tissue, and potential pathogens from within the canal. Endodontic files are available in different sizes and shapes, enabling the dental professional to gradually advance through the canal, thus ensuring a shape that allows for effective irrigation, obturation, and sealing.

In this context, while other instruments like the barbed broach are useful for specific tasks, such as retrieving canal debris, they do not focus on shaping and enlarging the canal in a controlled manner like the endodontic file does. Endodontic reamers also serve a role in root canal preparation but typically cut more aggressively than files, making them less suited for the gradual widening process. The finger plugger is primarily used for compacting filling materials into the canal and does not contribute to altering the canal diameter.