Ultrasonic dental scalers.
D003762:Dental Instruments / Q000145:classification*; D003773:Dental Plaque / Q000517:prevention & control*; D003777:Dental Prophylaxis / Q000295:instrumentation*; D012534:Dental Scaling / Q000295:instrumentation*; D006801:Humans; D014465:Ultrasonics / Q000295:instrumentation*