Endodontics is the speciality that deals with the treatment of root canals. It is the “basis” of conservative dentistry because a well-treated tooth from endodontic point of view means its increased longevity on dental arches.

When the nerve is inflamed and infected, the doctor cleans mechanically and chemically the interior of root canals, then it fills them with antibacterial material (canal obturation). When the tooth evolution is not towards healing after the canal obturation, another endodontic treatment can be carried out. This procedure is more difficult than the initial treatment due to the difficulty to remove the obstacles occurred on the course of dental canals.

Possible causes that generate the failure of an endodontic treatment:

  • curved and narrow canals that could not be made permeable until the top;
  • anatomy of root canals that can have large variations from one tooth to another;
  • subsequent reconstruction of the tooth did not manage to seal the treated root;
  • the tooth was initially infected and the infection was not resolved.

Qualities of a sustainable canal obturation:

  • the canals must be enlarged to the top and disinfected;
  • the canal obturation must fill tridimensionally the canalicular space and come up to the root top (apex);
  • the material used for obturation must be biocompatible, disinfectant and non-resolvent;
  • the post-obturation radiologic image must show a uniform obturation on the entire canal length.

A canal obturation performed in this way prevents the inflammation of the bone tissue that surrounds the tooth root and can treat lesions already present at this level. These are the reasons for which the treatment of root canals takes time (a few sessions are sometimes necessary), it is expensive and difficult to be performed. But the tooth future depends on its success.