Root Canal System

1
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
2
Retreatment
3
Retreatment
4
Retreatment
5
Retreatment

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

6
Retreatment

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

7
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

8
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