DUWL Basics
What does DUWL stand for?
Dental Unit Waterlines
What is biofilm
A layer of microorganisms that sticks to and grows on a moist surface
What bacteria level is recommended for routine dental treatment water
500 CFU/mL or less
Why do dental unit waterlines need regular maintenance
To control microorganisms and prevent biofilm buildup
A waterline test shows 800 CFU/mL. What should the dental team do?
Treat the waterline according to the manufacturer’s instructions and then retest the water.
What is the main purpose of a dental unit waterline
To carry water to dental instruments for treatment, cooling, and irrigation
Why can biofilm develop inside dental waterlines
Because the tubing is narrow, water flow can be slow and water can sit inside the lines
Why does water quality matter in dentistry
Poor water quality can expose patients and dental staff to microorganisms and contaminated aerosols
Name two methods used to control biofilm in waterlines
Chemical treatment and filtration
A dental assistant wants to use a waterline cleaner without checking the instructions. What should they do first?
Check and follow the manufacturer’s instructions for the dental unit and treatment product.
Name two dental instruments that use waterlines
High-speed handpeices, air/water syringes, and ultrasonic scalers
name one microorganism that can be found in contaminated dental waterlines
Legionella, pseudomonas, or nontuberculous Mycobacteria
How can dental offices monitor their water quality
By testing the water with the appropriate test kits or laboratory testing
How long should water and air be flushed from devices that enter the patients mouth between patients
At least 20-30 seconds
A patient is having oral surgery. Should the dental team use regular dental unit water for surgical irrigation?
No. Sterile water or sterile saline should be used for surgical irrigation.