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 internally.
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 patient's 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 patient's 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 fabricated.
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 8-11. - Articulator.
Figure 8-12. - Bench lathe.Continue Reading