30 extracted, single-rooted teeth were prepared with Pro-Taper Dentsply-Maillefer. At the apical third of each of these teeth, ProTaper F3 rotary instruments were deliberately fractured.
Un total de 30 dientes unirradiculares extraídos fueron instrumentados con ProTaper Dentsply-Maillefer, en cada uno de los mismos se fracturaron intencionalmente instrumentos rotatorios ProTaper F3 en el tercio apical.