A rubber stopper was placed at a Gates Glidden number 2 burr Dentsply, Maillefer. Freeing of the canal was undertaken with low speed hand-piece;intermittent movements were used to achieve this aim.
Se dividieron en forma aleatoria en 3 grupos de prueba cada uno de 10 dientes y se realizaron radiografías periapicales para establecer las medidas de los conductos.