Single-use disposable sponge.

A sponge for file holder square is a small, square sponge that is used to hold files in place in a file holder. The sponge is typically made from a soft, absorbent material, such as foam or polyurethane. It is also typically non-toxic and autoclavable.

Sponges for file holder square are used in endodontics, a branch of dentistry that deals with the root canal system of teeth. They are used to hold files in place while the dentist or dental hygienist is working on the root canal. This helps to prevent the files from slipping out of the holder and getting lost or damaged.

Sponges for file holder square are typically available in a variety of sizes to accommodate different file holders. They are also available in a variety of colors, so dentists and dental hygienists can choose a color that matches their preference.