... 2.The function of bone is mainly used for dental surgery, such as dental extraction, bone grafting, osteogenic distraction, endodontic surgery,alveolar ... . etc.3.The function of root is mainly for mechanical ultrasonic treatment, such as periodontic, endodontic and prevention treatment.4.Handpiece ... frquency: 24kHz~29.5kHz 3.Output power:3~20w Woodpecker Dental Ultrasonic Ultrasurgery Surgical