A hand-held manual dental instrument designed to debride and enlarge the root canal and smooth its walls by a cutting or abrasive action when moved in a longitudinal direction. It is made of metal [e.g., stainless steel, nickel-titanium alloy (Nitinol)] and its working end has a polygonal cross-section with edges. It may also be referred to as an endodontic reamer. This is a single-use device.