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Step 8 Incorporate the lingual of the teeth and just below the teeth to catch the contour of the lingual waxup. The matrix ends on the lingual side just below the teeth, leaving a portion of the wax exposed which is the area into which you pour the acrylic.
Step 14 Mix the Palapress vario; the acrylic has great flow characteristics and, by capillary action, flows even to the smallest single anterior lateral flange with no air bubbles and no vents.
Step 15 Fill the cavity from either the mesial or distal of the opening, allowing the acrylic to flow into the mold and minimize trapped air. Once the matrix is full, immediately put it in the curing unit at 55oC with 30 lbs of pressure for 30 minutes and then recover the partial by removing the matrix. Remove the flash by grinding on the lingual and polish the appliance.
Steps 3, 4 & 5 When you’re preparing to make the matrix, keep in mind that the end result will only be as accurate as the matrix. Select a firm silicone lab putty; CutterSil Putty Plus from Heraeus is excellent. Measure the hardener and mix with your hands.
Step 10 Boil the wax from the model and teeth, and place the teeth in the matrix. Put just a dot of Super Glue® on an incisal edge or two cusp tips—one lingual and one buccal—to keep the teeth from shifting as the matrix is placed back on the model.
Steps 1 & 2 Wax the case in the usual manner. If you have a distal-free end, make sure you have some land area in the posterior for the matrix to rest on to ensure the occlusal dimension doesn’t change.