User manual

Fabricating the Wax Pattern in the Dental Office

A wax injector enables the ability to fabricate the wax pattern in the dental office and modify

this custom occlusal rim and take all the patient records on the same appointment as the

impression. (Figure 14).

The optimum injecting temperature is 170–190°F. This temperature is typically reached by setting

the injector at the Medium/High position. It will take about 20 minutes to reach this temperature

from a "solid" state. Experiment with your injector to find the optimum position for injecting. Mark

this position on your machine for future reference.

Spruing The Alginate Lower Container

Entrance Sprue Hole: Using a thin tapered bur, approximately 1/8" in diameter (determine the

size bur that works best for you), drill a hole through the anterior of the container entering the

void created by the denture. The sprue hole should be started approximately in the middle of the

container, not near the containers ledge, and enter the void above the ANTERIOR TEETH IN THE

ANTERIOR FLANGE (Figure 165, 165, 15C).

Do not have the sprue hole enter the midline of the anterior teeth as the anterior teeth need to be

accurately represented in the wax pattern. The hole can also be made using a cork boring tool or

small 3/16" thin straw, once a small hole is cut through the container (Figure 16).

Exit Sprue Hole(s): The exit sprue for the maxillary arch can be made similarly as the entrance

sprue and should exit the distal end of the impression void. The exit hole should be directly opposite

the entrance hole for the maxillary arch. If you prefer, you can make 2 exit holes in the maxillary

arch — one at one at each distal end of the maxillary denture. Be sure to make these holes at the

“highest point” of the void when held vertically, as to allow the wax to fill the entire void before

exiting. In the mandibular arch there is one entrance sprue hole and two exit holes — one at each

distal end of the mandibular denture, exiting the distal retromolar area (Figure 17). Note: Be careful

not to make the exit holes in an area where the stone cast will cover the holes. These holes must be

made in the void itself.

Figure 16

Figure 17

Figure 14

Figure 15A

Figure 15B

Figure 15C