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Class Code Information


Dental Laboratory


Code 4692 applies to employers engaged in operating dental laboratories.  Dental laboratories manufacture teeth replacement dental appliances or enhancement products such as bridges, crowns and dentures, and orthodontic products such as braces and retainers.  According to a dentist’s prescription, these laboratories will custom make the above products.  Replacements are normally made to match a patient’s natural teeth color.

Raw materials such as plastics, acrylics, gold, waxes, alloys, porcelain, wire, steel, titanium, other natural minerals and man-made substances are used to make the actual dental replacements.  The lab technicians that manufacture the dental replacements use small hand tools, grinding and polishing equipment, burners, small furnaces and crafting instruments such as carvers and wax spatulas.  

The patient’s dentist will furnish the dental laboratory with impressions of the patient’s mouth that they have taken.  The dental laboratory will create a plaster model from the impression that the dentist provided.  Once the plaster model is cured, it will be placed on to an articulator for which the patient’ selection of teeth is attached with wax.  The wax is shaped and carved by the laboratory technician, set into a flask for which plaster is added to preserve the denture’s shape.  The wax needs to be removed from the flask which is done by putting the flask into boiling water.  If any of the wax remains, it will be washed away.  So that the acrylic does not stick to the plaster, a liquid separator is applied prior to the injection of the acrylic.  Acrylic is then ready to be injected into the flax.  When the acrylic cures, the plaster mold is broken away by the laboratory technician by means of special tools.  The dentures are washed in an ultrasonic bath to remove any miscellaneous fragments, trimmed and polished.  The completed dentures are sent to the dentist. The dentist will have their patients try on the dentures.  It may take more than one fitting to assure proper fit.  Any required adjustments to the dentures are performed by the dental laboratory. 

This classification also includes the repair of dentures by the dental laboratory.

Assignment by Analogy

No Information

Operations to be Separately Rated

  1. Drug, medicine or pharmaceutical preparation – no manufacturing of ingredients.  Refer to Code 4611 “Drug, Medicine or Pharmaceutical Preparation – No Mfg. of Ingredients.”


Industry Group

All Other Manufacturing