The lathe is used with rotary instruments (burs,
stones, arbor bands, and ragwheels, etc.). An adapter
and/or chuck is required to attach these instruments to
The Bunsen burner (fig. 8-13) heats wax-carving
instruments, waxes, and modeling compound. It
requires a balanced air and gas mixture to produce a
clean blue flame. It is attached to a gas valve with a
Inspect the unit and hose daily for loose
connections and defects. Have the hose replaced when
it shows signs of wear. When wax or similar material
drops into the burner, the burner assembly detaches
easily for boiling out and cleaning.
Never leave an unattended burner lit or
reach over an open flame, because the
flame is almost invisible and can cause
The cast trimmer (fig. 8-14) is used to trim and
contour casts. A cast should present a neat, attractive
appearance. This electrically operated machine has a
10-inch abrasive wheel, a small work table, and a
water-dispensing mechanism to keep the abrasive
wheel rinsed clean and clog free.
Before using the trimmer, ensure the water supply
is on. Allow the water to run for at least 1 minute after
Figure 8-13.Bunsen burner.
Figure 8-14.Cast trimmer.
the procedure is complete. This will flush most of the
particles from the trimmer drain and help prevent
When operating the trimmer, be sure to
keep your fingers away from the wheel.
Always wear safety glasses or goggles.
Using light pressure, press the cast against the
trimming wheel. Ensure that the water spray is
sufficient to contain the grindings.
Check the unit for water leaks and the power cord
for wear or damage. If the unit it does not operate
correctly, contact the dental equipment repair
technician. Clean the trimmer at least quarterly, or
more frequently, depending on the amount of usage.