Profile: Polytec GmbH develops its own, innovative, laser-based measuring instruments. The instrument provided by us for tooth debridement is the ultrasonic scaler. Ultrasonic scalers remove deposits from tooth surfaces through the mechanical chipping action of the scaler tip as it is maneuvered over the tooth surface. Because of this, the magnitude of the vibration displacement amplitude has regularly been used as an indicator of the efficacy of the ultrasonic scaling system. The motion of dental ultrasonic scalers is difficult to visualize due to their high frequency vibrations and small associated displacement amplitudes. Laser vibrometry has made it possible to study in detail the vibration patterns of dental ultrasonic scaling equipment.