Retreatment of failing endodontic procedures REDUX (2)

Reasons for failure
subsequent to retreatment

·       Incomplete debridement

·       Inadequate apical enlargement

·       Extra-radicular infection

·       Resistant Intra-canal infection (E. faecalis)

·       Root surface biofilm 

·       Foreign body
reactions

·       True cyst

·       Non-negotiable canal (obliteration,
deformations from initial treatment,missed canals)

·       Ledges,blockages, transportation

·       Vertical root fracture

·       Coronal re-infection

·       Apical Surgery

o  
Missed
canals/roots during surgery

o  
Coronal
leakage

o  
Leakage
of retrograde filling