Broken Instrument Removal

"1. Linear canal Removal of the coronal dentine in order to create the space useful to an extractor to catch and remove the instrument. The preferred instrument to reach this aim is a .15 or .20 ultrasonic tip.~2. Curve canal When the instrument is broken inside a curve canal, it is not possible to create a circumferential space around the separated instrument without the risk of root perforation. Thus, the first step is the removal of the dentine of the external wall of the root canal. The second step is the removal of the dentine of the internal wall of the root canal. This selective removal of dentinal tissue unlocks thee separated instrument and determines its mobilization. Thus, the irrigation itself makes the instrument available for the removal.~After the removal of the broken instrument, root canal preparation was completed Canal filling was performed based on Schilder's technique."