California RDA Written Practice Exam 2025 – Full Prep Guide

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Which of the following devices have been associated with dental water line biofilm?

Ultrasonic scalers

Ultrasonic scalers have been associated with dental water line biofilm due to their use of water during operation. The other options, dental drills, X-ray machines, and LED curing lights, do not require or use water during operation. This significantly reduces the risk of biofilm formation and subsequent contamination. Therefore, ultrasonic scalers are the only device among the choices listed that is commonly associated with biofilm.

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Dental drills

X-ray machines

LED curing lights

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