For many years endodontic dentistry has involve a series of basic rules. After pulp invasion and degradation by cariogenic bacteria, the first endodontic step include disinfection of the pulp located in the roots with sodium hypochloride or other alkaline agent. The root canal enlargement, using manual and/or the effectiveness of mechanical rotation of instrumental devices, followed this. They contribute to the shaping of the canals, and favor the filling of the pulp space with a zinc oxide/eugenol paste, and/or condensation in the main and accessory (secondary) canals with warm gutta-percha