Procedure to remove Root canal filling materials from the tooth followed by cleaning, shaping and filling the canals. This is indicated when previous endodontic treatment has failed. The main cause of initial treatment failure is bacterial persistence within the root canal.
Here are some of the following reasons why a retreatment is necessary:
Cracked crown leaking filling material.
Curved or narrow canals not treated during the original procedure.
Delay in the placement of restorative devices following the procedure.