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Step-by-step procedure
Investment (lower flask half)
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Isolate the flask against plaster using Vaseline. Place the
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investment aid (1) in the flask, mix the plaster and invest
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the thoroughly water-soaked model. Remove excess
plaster from the thermal insulating component (2) and the
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flask edges.
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Placing the funnel
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Remove the investment aid after the plaster has set and
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position the injection funnel (3) and the funnel (4) in its
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place.
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Injection channels
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For complete upper dentures one injection channel is
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sufficient, fanning out from the funnel tip towards the
palate (Fig 3a). In the case of complete lower dentures
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two channels to the dorsal extremities of the dentures
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are required. (Fig 3b). For cast metal frameworks
with individual extension bases, either each base
must be provided with a channel at the distal end or
an interconnecting ring channel (dotted line) can be
fabricated (Fig 3c). Prior to investing the antagonist part,
the injection channels must be formed with pink wax.
This can also be done after boil-out or before isolating by
simply milling them in.
IMPORTANT:
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Injection channels must have a diameter of
3–5 mm
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Choose the shortest path
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Make sure not to damage the investment edges
along the injection funnel; they form a seal
towards the posterior shoulder of the flask.
Investment (upper flask half)
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Place the upper flask half on the lower one after isolating
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it with Vaseline or Ivoclar Vivadent Separating Fluid. Mix
the plaster and pour over teeth, avoiding the formation
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of bubbles, until the incisal edges and occlusal areas are
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lightly covered.
To make deflasking easier, apply a paper insert as
a separation layer (the insert should be moistened
with water).
Then, fill the flask to the brim, put on the cover and
completely press down by hand.
Do not close the flask with a press!
Boil-out procedure
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Preheat the flask in very hot water for at least 5 minutes.
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Remove wax and thoroughly boil out with hot and clean
water. Allow the flask halves to cool to room temperature.
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Remove adhering plaster residue from the flask edges and
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thermal insulation component.
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Isolation
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Isolate the still moist plaster surfaces twice with Ivoclar
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Vivadent Separating Fluid. Separating with a suitable
spray gun is also possible. Avoid pooling, eg in the
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gingivobuccal fold or interdental areas. Do not rinse
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isolated areas with water.
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Capsule preparation
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Remove monomer container from the capsule and break
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open by twisting off the sealing cap.
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Pour the monomer into the capsule. Re-insert the monomer
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container into the capsule base prior to mixing. Briefly
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shake the mixture.
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Mount the capsule in the Cap Vibrator, secure it with
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a rubber band and mix for 5 minutes. The SR Ivocap
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denture base material should form a ball in the process.
If this is not the case after 5 minutes of mixing, the
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material can be mixed for an additional 30 seconds. The
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failure of the material to form a ball does not influence
the quality of the denture base material.
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Remove the empty monomer container, eg with
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compressed air, place the capsule on the capsule plunger
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and press the contents upward with light rocking
movements. Allow air to escape through the capsule
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opening.
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IMPORTANT:
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Start mixing immediately following the addition
of the monomer (5 min in the Cap Vibrator).
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Do not mix longer than 7 minutes, as the resin
may become too warm, which increases the risk
of premature polymerization.
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There should be no air between the plunger and
the contents.
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Previously mixed capsules can be refrigerated in
the dark for 5 days. Allow them to regain room
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temperature before reuse.
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Clamping of the flask
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Place the injection funnel with the inserted funnel in the
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lower flask half. Carefully bring together the two flask
halves and ensure the correct fit of the flask covers.
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Then, completely insert the flask into the clamping frame.
Apply 3 tons / 6000 lbs pressure to the clamping frame
with the flask in a hydraulic press (corresponds to about
80 bar / 1133 psi hydraulic pressure). At the same time,
push the ratchet (B1) on the clamping frame to the right.
After that, cease applying pressure and remove the
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clamping frame with the flask from the press.
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Inserting the SR Ivocap capsules
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Remove the cover from the capsule and fully insert the
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capsule into the flask.
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