Root Canals Instrumentation & Irrigation & Obturation

Phases of root canal treatment:

1-Instrumentation
The shaping of the root canals is necessary with the removal of the debris and elimination of bacteria. The original shape of the canal and the apical constriction should be kept. Therefore, the final shape of the root canal should be tapered from the crown to the apex.

2-Irrigation
This preparation should be undertaken with copious amounts of irrigation.
After, that, a temporary restoration is placed to conserve the remaining tooth structure.

3-Obturation
Obturation of root canal (root canal filling) should be done after the completion of root canal preparation and elimination of infection and the canal can be dried. It consists of a semi-solid material in combination with a root canal sealer. The root canal sealer fills the voids between the semi-solid material and root canal wall.

In general, endodontic cavity preparation is divided into two parts, coronal cavity preparation and radicular cavity preparation. It includes different principles. G. V. Black’s principles for restoration of essential teeth are also applied during the preparation of the endodontic cavity.
1-Coronal cavity preparation comprises:
Outline form
Convenience form
Removal of the remaining carious dentin and defective restoration
Toileting of the cavity
2-Radicular cavity preparation includes:
Outline form
Convenience form
Toilet of the cavity
Retention form
Resistance form
Extension for prevention