hand. Grasp the instrument between your thumb and
first two fingers by the end opposite from the working
end as shown in figure 4-34 (step A). Hold the working
instrument close to the treatment area and parallel to
the instrument being used. Extend your little finger to
receive the instrument being used by the dentist as
shown in figure 4-34 (step B).
The signal stage takes place when the dentist
signals for the next instrument by slightly raising the
instrument from the tooth. During this stage, the
dentist maintains his/her fulcrum (finger rest) and,
with a pivotal action, rotates the working hand away
from the patient's oral cavity. This positions the used
instrument so that vou can grasp it with vour little
Figure 4-34.Instrument exchange (steps A through D).