figure 3-6. Follow the manufacturer's instructions on
setup, adjusting water flow, ultrasonic tuning, and
ultrasonic power. Some units are tuned automatically
while others require manual tuning.
ELECTRONIC GENERATOR.The electronic
generator produces the power required to activate the
handpiece. The three controls located on the front
panel of an automatically tuned ultrasonic unit are the
ON/OFF indicator, POWER ADJUSTMENT
CONTROL, and a WATER ADJUSTMENT
CONTROL. A manually tuned ultrasonic unit will
also have a TUNING ADJUSTMENT CONTROL.
HANDPIECE AND CABLE ASSEMBLY.
This assembly consists of a handpiece into which
interchangeable scaling inserts are placed. A cable
connects the handpiece to the generator. To place an
Figure 3-6.Ultrasonic scaler unit.
Figure 3-7.Placement of the insert into the handpiece.
insert into the handpiece, first lubricate the O-ring with
water. Then hold the handpiece with the open end
upright over a sink or suitable basin. Step on the foot
switch to turn on the unit and flood the handpiece
chamber with water. Stop flooding when you see the
water has reached a level halfway up the handpiece.
Push the insert into the open end of the handpiece with
a twisting motion (fig. 3-7); a small amount of water
may be displaced by the insert stack and may spill out.
Check to see if the insert is fully seated. With the insert
in place, hold the handpiece in an upright position.
Activate the insert and bleed off any air trapped during
handpiece insertion. Allow the water to run from the
handpiece for a few seconds until it flows without
spurting. Repeat this procedure each time an insert is
placed into the handpiece. Trapped air does not
interfere with the handpiece operation, but can cause
excessive heating of the instrument.
INTERCHANGEABLE INSERTS.A set of
interchangeable inserts facilitates access to all areas of
the mouth. The components of an insert include the
insert tip, water outlet, plastic grip, O-ring, connecting
body, and the magnetostrictive stack (fig. 3-8). The
water outlet delivers preheated water along the entire
working length of the tip. The O-ring acts as a water
seal when the insert is placed into the open end of the
handpiece. A connecting body transmits motion from
the stack to insert tip. The magnetostrictive stack
converts electrical power supplied to the handpiece
into mechanical vibrations to activate the insert tip.
FOOT CONTROLLED SWITCH.The
handpiece is activated by a foot-operated on/off
switch. When the foot pedal is held down, the
handpiece is activated and water flows. Both the
handpiece and water flow are shut off when the pedal is
Attached to the ultrasonic scaling unit is a water
supply hose. The free end of the hose attaches to a
Figure 3-8.Components of the interchangeable inserts.