Model Duplication Fabrication Technique

Model Duplication Fabrication Technique
Using the Platform and Using Pellets for Mounted Models
Safety glasses should be worn for all lab procedures as well as gloves when handling acrylics. Items featured in this
technique are found on the last page.
An accurate model duplication matrix can be made of soft material (Bioplast or
mouthguard material) on the pressure molding machine. It can be poured to
reproduce a specific dental mold at any time. Whether duplicating a model for
appliance construction or creating a matrix to be poured many times for hands-on
training courses, the pressure molding process is an economical technique to obtain
detailed accuracy. Orthodontic study, dental work, or articulator-mounted models can
be duplicated using the Biostar/Ministar.
1
Apply liquid separator to all model surfaces that will come into contact with the
formed material.
2
Place the model onto the platform with the heel facing the open chamber.
3
Place a sheet of 2mm or 3mm thick mouthguard or Bioplast material on the pressure
chamber. Secure in place with the clamping frame. Input code 183 (60 seconds
heating) for 2mm thick material or 233 (90 seconds heating) for 3mm thick material.
Position the heater over the clamped material to start the heating cycle.
4
Once the heating cycle is complete, remove the lamp and swing the pressure
chamber over the model on the platform. Lock the chamber in place by rotating the
handle on the right side of the machine from the 12 o’clock position to a 6 o’clock
position. Maintain proper air pressure while the material cools for 120 seconds (2
minutes).
5
Once the pressure molding cycle has concluded, evacuate the air pressure from the
chamber and unlock the chamber with the handle on the right side (12 o’clock
position) of the machine. Slide the clamping frame to the left to release the formed
material from the pressure chamber. Open the pressure chamber.
6
Remove the model with formed material from the platform. Pull the opposite corners
(kitty-corner) to release the material from the model. Holding the model base,
carefully pull the model from the mold without turning the mold inside out.
7
Measure the dental stone or plaster powder-to-water ratio as recommended by the
manufacturer. Vacuum spatulate the mix for 30 seconds then vibrate it for 10
seconds while continuing the vacuum. With a plaster spatula, apply a small amount
of gypsum mix into the matrix while vibrating. Allow the mix to flow through the cusp
tips before adding more material. Add more gypsum while vibrating until the mold is
filled.
8
The bottom of the mold may be submerged in a flexibowl filled with water to brace the
matrix from the weight of the gypsum. This will result in more accurate model
duplication. Allow the gypsum to set for 30-45 minutes. Then remove the duplicate
model from the matrix following the same procedures that were used to remove the
initial model.
Model duplication technique of an articulator-mounted model.
1
Apply liquid separator to all model surfaces that will come into contact with the
formed material.
2
Remove the platform and pellets from the large cup. Place the mounted model into
the cup and fill the space around the model with pellets. Adjust the pellets with a 1”
paintbrush so they contact the bottom of the model base and the inside edge of the
cup’s rim.
3
To prevent pellets from sticking to the mouthguard material, a 0.10mm Isofolan
material is cut out and placed over the model after is placed in the pellets. Place
Isofolan over the model and trace the model base by viewing from above with a
sharpie marker. With no. 55 lab shears, cut out the drawn pattern from the Isofolan
sheet and discard the center portion. Place the cutout sheet around the model. The
cut out should fit closely down over the model to cover the pellets from the model
base to the cup’s rim.
4
Place a sheet of 2mm or 3mm thick mouthguard or Bioplast material on the pressure
chamber. Secure in place with the clamping frame. Input code 183 (60 seconds
heating) for 2mm thick material or 233 (90 seconds heating) for 3mm thick material.
Position the heater over the clamped material to start the heating cycle.
5
Once the heating cycle is complete, remove the lamp and swing the pressure
chamber over the model on the platform. Lock the chamber in place by rotating the
handle on the right side of the machine from the 12 o’clock position to a 6 o’clock
position. Cool formed material under pressure for 120 seconds.
6
Once the pressure molding cycle has concluded, evacuate the air pressure from the
chamber and unlock the chamber with the handle on the right side (12 o’clock
position) of the machine. Slide the clamping frame to the left to release the formed
material from the pressure chamber. Open the pressure chamber.
7
Remove the model with formed material from the platform. Pull the opposite corners
to release the material from the model. Holding the model base, carefully pull the
model from the mold without turning the mold inside out.
Items featured in technique:
235-010
235-062
175-034
075-007
021-031
021-032
Astro Spec Safety Glasses
(reg./blue)
N-Dex Non-latex Gloves (Med)
Liquid Separator
Separator Brush
2mm Clear Mouthguard Material
3mm Clear Mouthguard Material
215-016
210-109
210-106
205-017
030-002
220-023
800.828.7626 (US & Canada)
716.871.1161 (Worldwide)
716.871.0550 (Fax)
E-Mail: info@greatlakesortho.com
Website: www.greatlakesortho.com
Whipmix Orthodontic Stone
Large Hygienic Flexiboles
7 ½” Nylon Spatula
Handler Heavy Duty Vibrator
0.10mm Round Isofolan
No. 55 Plate Shears
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