An endodontic file having an extended measurement range of 14 mm is provided.Theendodontic file comprises a shank, a washer and a handle, the shank having aproximalend, a distal end, a proximal region and a fluted region, the washer slidablylocatedabout the proximal region of the shank, wherein the improvement comprises anexposed shank in an annular groove in the handle, the exposed shank and theannulargroove being about 1 to about 2 mm wide, such that in use, the exposed shankprovidesa user an extended depth measuring capability. A method of measuring a rootcanaldepth is also provided.
