What is the role of the root canal sealer in the obturation process?

The role of the root canal sealer in the obturation process is to seal out unfilled voids, which is crucial for the success of root canal treatment. After cleaning and shaping the canal, the sealer is used alongside gutta-percha or other filling materials to ensure that every part of the canal system is thoroughly sealed. This sealing is vital to prevent the re-entry of bacteria and contaminants, which could lead to treatment failure or reinfection.

The sealer's ability to fill in any gaps between the filling material and the canal walls helps to create a tight seal, providing a barrier that supports the treatment's effectiveness in removing the source of infection and preventing future problems. This function of sealing voids is essential for achieving a favorable long-term outcome for the tooth being treated.