Final answer:
The incorrect statement concerning ultrasonic scalers is that they are used to remove only supragingival calculus and difficult stains, as they can also remove subgingival deposits. Ultrasonic scalers operate using high-frequency vibrations in the range of 20-40 kHz.
Step-by-step explanation:
The incorrect statement concerning ultrasonic scalers is b) The ultrasonic scaler is used to remove only supragingival calculus and difficult stain. Ultrasonic scalers actually can be used to remove both supragingival and subgingival calculus. Ultrasonic scalers utilize high-frequency vibrations to disrupt dental calculus and biofilm. These oscillations typically occur around 20-40 kHz, which is well beyond the range of human hearing and thus falls into the category of ultrasound.
While there is some potential for tooth enamel damage if an ultrasonic scaler is used improperly, modern ultrasonic scalers are designed to minimize this risk when used correctly by a trained professional. Moreover, these devices play a crucial role in dental cleanings, thanks to their efficiency in plaque and tartar removal.
Ultrasonic cleaners are used in a variety of settings and operate through a process of cavitation, where the formation and collapse of bubbles in a cleaning fluid produce shock pressures that clean objects, including dental instruments. The analogy between ultrasonic cleaners of instruments and ultrasonic scalers in dental hygiene illustrates the wide application and effectiveness of ultrasound technology in cleaning processes.