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Mounting the pressure apparatus
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Fully extend the plunger of the pressure apparatus,
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e.g. by pulling the piston rod when the compressed air
locking valve is open.
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Place the SR Ivocap pressure apparatus on the flask, lift
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the safety loop (A4) and press the plunger into the capsule
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until the vise shanks are correctly positioned on the flask.
Then pull down the safety loop until it snaps into place.
Make sure that the plunger does not get jammed in the
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capsule.
Injection
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Connect the pressure apparatus with the compressed
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air locking valve closed to the compressed air supply
(6 bar / 85 psi). Slowly open the locking valve. The
plunger will descend and press the SR Ivocap material
into the mould.
IMPORTANT:
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Fully extend the plunger of the pressure
apparatus.
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Leave the material under pressure for 5 minutes
before placing it in a water bath.
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SR Ivocap material which is left over or which has
been in a mixed state for some time requires a
longer injection time of 10 minutes.
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Allow leftover material to regain room temperature
before use.
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When the red ring on the piston rod becomes
visible during injection, mix a new capsule and
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replace the empty one.
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16 Polymerization
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Place the SR Ivocap assembly in a suitable polymerization
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bath. The surface of the water should be covered with
plastic floaters in order to prevent unnecessary loss of heat
(isolation). When immersing the SR Ivocap assembly in the
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polymerization bath, make sure that no plastic floaters are
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trapped beneath the clamping frame.
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The water level must reach the red mark on the clamping
frame and must be maintained at this level throughout the
polymeri zation period.
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The temperature of the water bath must be set in such a
way that the water boils during the entire polymerization
period.
The polymerization time once the water starts to boil is
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exactly 35 minutes.
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Do not interrupt the boiling procedure by introducing
other flasks.
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Content of residual monomer according to EN ISO 20795-1
< 2.2%. In order to reduce the content of residual
monomer below 1%, the material must be polymerized for
90 minutes in boiling water. The residual material will set
in the capsule during this time.
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Consequences of incorrect water level during
polymerization (Fig. 17)
over the red mark
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Capsule reservoir polymerizes; constant flow of the resin
during polymerization becomes impossible.
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Waste of material due to polymerization of leftover
material in the capsule.
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below the red mark
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Partially unpolymerized areas in palatal, post dam or
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retromolar areas
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Cooling
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After completion of the polymerization procedure, remove
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the SR Ivocap assembly from the boiling water and imme-
diately cool in cold water.
During the first 20 minutes of the cooling phase,
the pressure in the clamping frame and the
injection apparatus must remain unchanged.
After 20 minutes, the pressure apparatus can be removed.
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The clamping frame together with the flask, however,
must remain in cold water for an additional 10 minutes.
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Total cooling time: 30 minutes
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A locking valve on the pressure apparatus maintains the
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injection pressure at a constant level during the cooling
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phase, irrespective of the compressed air supply. This
results in increased mobility, since the cooling bath does
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not necessarily have to be near the air supply.
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Deflasking
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Mount the clamping frame in the press and re-apply
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3 tons / 6000 lbs pressure. Move the ratchet (B1) back to
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the left and release pressure. Remove the flask from the
clamping frame.
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Recommended procedure
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Remove both plastic covers, insert flask with the narrow
side to the front into the press. Place any suitable object
between the plaster investment and the pressing plate,
not touching the flask edges. Close the press with minimal
pressure.
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Introduce a broad screwdriver or plaster knife into the
joint beside the guide piece and lever the upper flask half
upwards.
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Remove the flask from the press and repeat the same
procedure with the flask reversed. The investment can
now be removed from the flask without difficulty and
without using force (e.g. hammer).
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Remove plaster in the usual way.
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Finish and polish as usual.
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