Root canal treatment can be divided into three main phases:
1) Biomechanical preparation (cleaning and shaping)
2) Disinfection, and
The initial step for cleaning and shaping the root canal is proper access to the chamber that leads to straight line penetration of the root canal orifices.
The next step is the exploration of the root canal, extirpation of remaining pulp tissue or gross debridement of the necrotic tissue and verification of instrument depth.
This step is followed by proper instrumentation, irrigation and debridement and disinfection of root canal.
Obturation usually completes the process