Tips for cleaner waterlines, valves
and tubes

When the button to the water syringe is released or the foot pressure on the rheostat is released, a phenomenon called "capillary action" takes place. Several drops of fluid are pulled back into the tip of the instrument being used. This fluid, while mostly water, can be contaminated with oral fluids. Flushing the instruments at the beginning of each day and between each patient helps to dilute the concentration of the microbes that have been pulled back and may have multiplied.

Install anti-retraction valves

Additionally, the Dental Practice Act requires dental offices to have "anti-retraction valves" (sometimes called "vacuum breaks") installed in each of these water lines. Most newer equipment has these valves installed by the manufacturer, while older equipment may not. If you are in doubt, ask your dental supply company representative to check your office and install the valves where necessary. The valves are inexpensive and easy to install for those who are comfortable doing some of their own office maintenance.

Flush waterlines daily

In addition, numerous studies have discovered that plaque-like colonies of microbes, called biofilms, adhere, grow and multiply inside the inner walls of small diameter tubing, including dental waterline tubing. The biofilms can accumulate in the valve mechanism and prevent the valve from working properly. Flushing the waterlines daily, periodic maintenance/cleaning of the anti-retraction valves and/or using a dedicated sterile water system is necessary. Check with your equipment manufacturer or dental supply company for instructions on how to service the valves.