Title: The importance of optimizing the working length in endodontics

Working length determination is a critical aspect of endodontic treatment, providing proper cleaning, shaping and filling of the root canal system. WL is ”Distance from a coronal reference point to the point where the channel preparation and obturation should end”, as defined by American Endodontic Association. Identifying this measurement incorrect can result in unfavorable treatment outcomes, which can include accidental extrusion of the irrigant, the filling causing apical periodontitis, postoperative pain and increased patient discomfort. The use of accurate determination methods are essential for successful results in root canal therapy in particular in tooth with canal curvature, apical foramen variations and the presence of pathology. To determine a correct working length, it is necessary to combine the physician’s clinical skills with advanced imaging techniques and the use of various measurement methods.