Ivoclar Vivadent IvoBase Material - Manual (Page 9)

9
7. Teeth
For an optimum bond, tooth necks and the basal
tooth surfaces must be absolutely free of wax.
Slightly blast the basal and cervical tooth surfaces
(100 µm Al
2
O
3
, 2 bar / 29 psi) or roughen them with
a dental tungsten carbide bur.
8. Isolating the stone surfaces
Important: Before isolation, cool the flask halves to
room temperature (<30 °C / 86 °F) using air or
clean, cold water. The exact flask temperature can
be checked with the help of an IR thermometer.
Isolate the clean surfaces of the plaster model with
Separating Fluid (F). Apply a second coat after
5 minutes. Pooling (e.g. in the gingivo-buccal fold)
must be prevented.
9. Placing the aeration filter
Insert the aeration filter (E) flush into the
corresponding recess in the flask.
10. Placing funnel and centring insert
Push the IvoBase funnel (D) into the centring insert
until it snaps into place so that it is locked. Place the
centring insert with the inserted funnel (D) in the
lower flask half.
Assemble the flask halves and lock using the locking
clasps.
Injection and polymerization
The operation of the IvoBase Injector is described in
detail in the corresponding Operating Instructions. The
IvoBase Injector must be brought to its stand-by state
before the material is mixed.
11. Mixing the material
One capsule is sufficient for the injection of a maxillary
or mandibular complete denture.
Contents of the capsule: Monomer Polymer
IvoBase Hybrid 20 ml 34 g
IvoBase High Impact 20 ml 30 g
Remove the monomer container (A4) from the
capsule. Remove the capsule seal (A1).
Twist off the sealing cap of the monomer container
(A4) and pour the liquid into the open capsule (A2).
Use the spatula (C) to mix the monomer and poly-
mer in the capsule to a homogeneous mixture (for
approximately 20–30 seconds).
12. Loading the Injector
Proceed as follows within 5 minutes after mixing:
Place the open capsule (A) on an even surface and
press the flask onto the capsule (A).
Note: Do not tilt the flask with the capsule prior to
polymerization to prevent the material from flowing out
of the capsule (A). When the flask is lifted, the capsule
(A) must be located securely in the centering insert.
Open the door of the Injector. Slide the flask with
the capsule (A) into the polymerization chamber
until it stops via the flask holder. Close the door of
the Injector.
13. Starting the program
Select the corresponding program (see Operating
Instructions of the Injector for a program overview).
If desired, activate the RMR key in order to reduce
the residual monomer content to <1%.
Press “Start”. The fully automated injection process
begins. The remaining process time is indicated in
the display.
At the end of the program, an acoustic signal
sounds. Use the thermal glove to remove the hot
flask from the Injector by holding it by the isolation
shoulder. The Injector is ready for the next polymeri-
zation immediately after the the flask is removed.
Note: The flask may still be very hot when removed
form the Injector. Burn hazard!
14. Cooling the flask
Cool the flask under cold running water for at least
15 minutes. As an alternative, cooling may also take
place in the Injector (e.g. over night).
Important: If the flask is not cooled down and opened
at too high a temperature, inaccuracies of fit may result.
15. Divesting the dentures
Remove the locking clasps.
Place the flask under a dental press. Secure the
divesting aid between stone and pressing plate.
Slide a broad screw driver or plaster knife into the
joint between the two flask haves and lever the
upper flask half upwards. Remove the flask from the
press, turn it around and repeat the procedure.
Remove the stone core with the capsule and sepa-
rate the capsule at the sprue using a separating disk
bur or saw. Divest the denture from the stone core
as usual with stone tongs.