DANB Dental Waterline Safety

Question 1

What is the CDC-recommended maximum bacterial count for dental unit waterlines?

Accepted Answer

≤500 CFU/mL, consistent with EPA drinking water standards

Answer

≤1000 CFU/mL

Answer

≤100 CFU/mL

Answer

≤5000 CFU/mL

Question 2

What causes biofilm formation in dental unit waterlines?

Accepted Answer

Bacteria adhering to the interior surfaces of narrow tubing, forming a protective matrix

Answer

Mineral deposits from hard water

Answer

Chemical reactions between cleaning agents

Answer

Excessive water pressure in the system

Question 3

What is the recommended protocol for flushing dental waterlines at the beginning of the day?

Accepted Answer

Flush for at least 2 minutes with all handpieces and air/water syringes

Answer

No flushing is necessary if chemicals are used

Answer

Flush for 5 seconds only

Answer

Only flush if the water appears cloudy

Question 4

How often should dental waterlines be tested for bacterial contamination?

Accepted Answer

At least monthly, or per the treatment product manufacturer's recommendations

Answer

Only during annual inspections

Answer

Never, if treatment products are being used

Answer

Every 5 years

Question 5

What types of waterline treatment products are available for dental offices?

Accepted Answer

Chemical treatment tablets/cartridges, self-contained water systems, and in-line filtration

Answer

Only bleach solutions

Answer

Standard household water filters

Answer

No treatments exist for dental waterlines

Question 6

Why must sterile water or sterile saline be used during surgical dental procedures?

Accepted Answer

To prevent introduction of waterborne microorganisms into surgical sites where tissue is exposed

Answer

Because tap water tastes bad to patients

Answer

To comply with insurance requirements

Answer

To improve visibility during surgery