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 lathe.
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 non-collapsible hose.
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 serious harm.
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 clogging.
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.
Figure 8-15. - Face-bow.Continue Reading