This tutorial shows you how to easily duplicate dental models using either Accusil™ or Rapidsil™ silicone, Garreco Duplicating Ring, Duplicating Cross, Silsaver™, and gypsum.
Step 1: Prepare model for duplication
Trim model base at 90° angle leaving ample clearance space for silicone material.
Incorrect model examples shown below. Military style models will not allow ring to adhere properly. Angled trim will elongate the ring. Trimming the model too closely will leave no space for silicone material.
Tip: Models which have been trimmed incorrectly may be used by adding “Silly Putty” to deficient areas, prior to adhering duplicating ring.
Step 2: Adhere Duplicating Ring and prepare Silsaver and Duplicating Cross
Cut Duplicating Ring about 1.5 inches longer than required to completely wrap base of model.
Apply a small amount of petroleum jelly between overlapping layers for a tighter seal. Do not attach layers with staple or paperclip.
Prepare Silsaver and Duplicating Cross by adjusting the distance between the Silsaver and teeth cusps to 1-2mm.
Step 3: Mix and pour silicone mixture into Duplicating Ring
Measure equal parts of Garreco Accusil or Rapidsil by either weight or volume. Add A & B portions together and mix by mechanical means under vacuum for 60 seconds, or by hand until mixture is of uniform color.
Pour mixture into Duplicating Ring, utilizing a small stream to minimize bubbles. Place Duplicating Cross and Silsaver into silicone material. Full ring should be placed inside a dry pressure vessel at 30 psi, to decrease remaining air bubbles. Allow to set for 30-40 minutes.
Step 4: Remove Duplicating Ring and prepare mold
Remove Duplicating Ring and Duplicating Cross.
Use air pressure to loosen master model then remove. Remove any silicone or gypsum particles from mold interior. Apply Sila-Sep™ to mold to reduce the surface tension.
Reposition Duplicating Ring around silicone duplication.
Step 5: Mold ready for gypsum/investment
Measure, mix, and pour gypsum into mold. After gypsum is set, remove the Duplicating Ring and separate your new gypsum model