Then a new F3 file was introduced. This file had previously received a fissure performed with a 2 mm diamond burr. This burr was placed over the tip to ease fracture. Even, constant pressure was applied until separation took place.
Posteriormente se introdujo una lima F3 nueva con una fisura previamente realizada con una fresa de diamante 2 mm por arriba de la punta para facilitar su fractura, con presión constante hasta que ocurrió la separación.