Step 3 of 5
Lock the plate into the vacuum-molding machine, place the gypsum model centralized under the plate, and start the equipment to begin heating the plate. As soon as the plate shows a small bending (2 to 3 cm), attesting its softening, lower it quickly over the model, and on the vacuum for 10 to 15 seconds. The plate should adjust to the contour of the model, mainly at the borders next to the gums, as at this point it shall form a retention border of the gel into the mold. The removal of the plate must be made after it has cooled down completely.