minute, after each patient, and at the end of the
workday for 30 seconds following BUMEDINST
THREE-WAY SYRINGESEach dental unit
has at least one 3-way syringe that provides a stream of
(1) air, (2) water, or (3) a combination spray of air and
water. Many of the new syringes have a quick
disconnect that allows the syringe tip to be changed for
each patient and is autoclavable. The water
temperature control, if equipped, on the dental unit,
can be adjusted to keep the temperature of the water at
The dental light (fig. 11-7) illuminates the
patients mouth and treatment area. It may be on a
ceiling track or mounted to the DDS. The light should
be properly positioned 30-36 inches from the patients
face. Most dental lights mounted to the DDS consist of
three major assemblies: the transformer and rigid arm
assembly, flex arm assembly, and the light head
assembly. The intensity switch located on the
transformer housing is used to set the intensity of the
light to low, medium, or high settings.
The dental light head rotates on three different
axes. It can rotate as much as 180° horizontally, 125°
vertically, and 45° diagonally from either side.
To perform a daily operational check on the dental
Turn light on.
Move light ensuring a free full range of motion.
Light should not drift. If drifting is discovered,
initiate a repair request
Often, at the most inconvenient time, the bulb in
the dental light burns out. To avoid further delays, you
need to know how to quickly and properly replace the
bulb. Use the following steps to change a bulb:
Turn the light switch to the off position and
allow the bulb to cool.
Release the fastening devices on the light shield
and move the shield aside.
Use a gauze pad or cloth to protect your fingers
when removing the bulb. Very carefully pull the
old bulb from the socket and discard it.
Most units have a spare bulb compartment on the
light assembly. Open the wrapper of the new
bulb to expose the bulb pins, but do not remove
the bulb from the wrapper.
Use the wrapper to protect the bulb #while
installing it. This is necessary because finger
oils limit bulb life and can affect light
Figure 11-7.Dental light.