Katana-V ultrasonic and Katana-H when they become

and Katana-H when they become chipped or dull

The Micro-trephine bur is used at 600 rpm in a counter-clockwise direction to encourage separated files to unthread from the canal as the trough is cut

The ultrasonic preparation continues until the movement of the broken instrument is confirmed under the 4 magnification

Used in straight nosed handpiece at 5000RPM

creating a small space adjacent to the fractured file edge

Katana-V ultrasonic and Katana-H when they becomeKatana V is ultrasonic tip with flat surface that should face towards the separated file. The instrument is used (dry) to wedge into the space on the inside of the canal curve between the separated file and the canal wall, creating a small space adjacent to the fractured file edge.