edge Formation : Review of a Great hallenge in Endodontics amid

ontists bstract ailure to grasp the rationale behind cleaning and haping concepts can increase the occurrence of needess complications, such as ledges. A ledge is created hen the working length can no longer be negotiated nd the original pathway of the canal has been lost. xtension of the access cavity to provide unobstructed ccess to the root canals, precurving and not forcing nstruments, using NiTi files, using passive step-back nd balanced force techniques, and instrumenting the anal to its full length will all help to prevent ledge ormation. Initial negotiation and bypassing the ledge an be achieved using a small file with a distinct curve t the tip, whereas a slight rotation motion of the file ombined with a picking motion can often help adance the instrument. A review of the literature and a iscussion of the options for prevention, recognition nd managing the ledge are presented. (J Endod 2007; 3:1155–1162)