An insert intended to be attached to an ultrasonic dental scaling/debridement system handpiece, to transmit ultrasonic energy (e.g., 25 kHz/30 kHz) from a generator to fragment and dislodge the debris within the dental pulp for removal during an endodontic procedure; it is not primarily intended for dental cleaning or periodontal therapy. Also referred to as an ultrasonic endodontic file or rasp, it is available in a variety of forms and sizes, and is typically made of metal. This is a reusable device.