Root Canal “System” The complexity of the root canal system cannot be underestimated. All portals of exit must be sealed to ensure elimination of periradicular pathology

RetreatmentRetreatment

RetreatmentRetreatment

RetreatmentRetreatment

RetreatmentRetreatment  Flexipost cemented in palatal canal – ultrasonic removal  MB2 orifice not identified previously  contaminants evident in other canals  Flexipost cemented in palatal canal – ultrasonic removal  MB2 orifice not identified previously  contaminants evident in other canals

Retreatment  post removed – all canals identified and negotiated  Class I inlay preparation initiated for NiTi accessibility  heated NaOCl (150 o F) and EDTA left to soak in chamber and canal system throughout procedure

Retreatment  canals shaped, cleaned and obturated  gutta-percha seal to orifice interface with chamber floor  bristle brush and ethanol used to remove sealer from chamber  chamber then etched with phosphoric acid in preparation for sealing of the chamber floor and canal orifices

Retreatment  dentinal adhesive (PQ1) used in conjunction with Permaflo to create bonded composite layer over the canal entrances to the root canal system as well as close any furcal canals  further layering of core material can be applied after micro-etching  bonded core depth sufficient to preclude need for post placement