The alcohol torch (fig. 8-10) is used for smoothing
wax surfaces, setting teeth, and waxing. It is also used
with a variety of tasks that require an accurate,
controlled pointed flame. It draws fuel through a wick
from a reservoir near the top of the torch. Periodically
trim all irregular or burned areas of the wick and check
the nozzle tip to ensure that it is free from obstructions.
Never overfill the fuel reservoir or attempt
to fill it with the flame lit.
Before using an alcohol torch, you should check
the fuel level. Many different types of fuels can be
used with an alcohol torch. Isopropyl alcohol in a
solution containing about 70-percent alcohol and
30-percent distilled water by volume produces a flame
of very poor quality. Further, 100 percent isopropyl
alcohol tends to smoke badly while burning, which
makes it somewhat undesirable as torch fuel. The best
choice fuel for the alcohol torch is denatured alcohol
(ethenol), which produces a clear blue flame.
However, care with the accountability of denatured
alcohol must be taken when used and distributed.
Rubbing alcohol is unsuitable as a fuel.
Note: Methyl alcohol is highly poisonous if taken
Do not leave the torch unattended when lit.
Extinguish the torch when not in use by covering the
wick with the nozzle holder assembly.
Figure 8-10.Alcohol torch.
The articulator (fig. 8-11) is used to reproduce the
patients jaw movements. The dental cast made from
impressions are mounted onto the articulator. This
allows the dentist and the laboratory technician to
recreate the normal movement of the patients jaw
during the fabrication of the prosthesis. There are
several types of articulators. The type of articulator
used depends upon the type of prosthesis being
The bench lathe (fig. 8-12) is used during grinding,
finishing, and polishing procedures. Always wear
protective glasses or goggles when working with the
bench lathe. Ensure that all chucks and attachments
are securely mounted before starting the lathe.
Never leave an unattended lathe running,
or attempt to stop the lathe by grasping the
attachment with your hands.
Figure 8-12.Bench lathe.