The indicatation for Ultrasonic K files are irrigation, withdrawal of calcified dentine and gutta percha, and the withdrawal of broken instruments.
For irrigation ultrasonic fules are used with a disinfectant solution. To provide final decontamination, use sodium hypochlorite until the smear layer is removed.
K files are very sharp instruments and should be handled with precision. However they are flexible and can therefore be pre-bent.