Which microorganism is a common cause of contamination in dental unit water lines?

Legionella is recognized as a common cause of contamination in dental unit water lines due to its ability to thrive in water systems, particularly those that operate at temperatures suitable for its growth. This microorganism is known for causing Legionnaires' disease, a severe form of pneumonia, and can be aerosolized in water, posing a risk of inhalation for patients and dental staff during procedures that use water sprays. The presence of biofilm within dental unit water lines can harbor Legionella, making routine monitoring and maintenance critical to infection control in dental practices. Proper sterilization of water lines and adherence to guidelines for water quality can help mitigate the risks associated with this organism.