Ivoclar Vivadent IvoBase Material - Manual (Page 8)

8
Processing
Preparing for injection
1. Preparing the flask
Isolate the inner surfaces of the clean flask halves
with a thin layer of petroleum jelly.
Place the flask lid, access former half and the filter wax
component (B1) in one of the flask halves from the
inside.
2. Investing the model
Invest the well-soaked and isolated model in one of
the flask halves using conventional dental stone
(Class III). Skim off the excess stone in such a way
that it is flush with the model and the edge of the
flask housing.
Important: The stone edge must be flush with the
access former half.
3. Positioning the wax components
The wax of the wax components (B) can be placed on
the model without any additional wax-up. Make sure
that no stone can flow below the wax components.
Allow the stone to set thoroughly. Remove the
access former half and place the access former full.
– Place the injection wax component (B2)
Press the injection wax component (B2) onto the
incline of the access former full.
Maxillary complete dentures
Position a sprue at the centre of the palate roof and
on the vestibular side of each upper cusp and press
the wax onto the model.
Mandibular complete dentures
Place one sprue each to the lingual area of the
retromolar triangle. Cut off the centre sprue of the
injection wax component (B2).
Partial dentures
Place a sprue at the dorsal end of each denture
saddle.
– Place the aeration wax component (B3)
Press the aeration wax component with the aeration
channel to the centre of the filter wax component.
Important: The aeration channels must not come
into contact with the flask housing when being
pressed into place in order to ensure the tightness of
the flask.
Mandibular and maxillary complete dentures:
Press the three channels of the aeration wax
component (B3) to the anterior area of the
contouring.
Partial dentures:
Press the three channels of the aeration wax
component (B3) to the anterior stops of the denture
saddles. If the aeration wax component (B3) is not
long enough, the connection between the denture
saddle and the filter wax component has to be
completed with a wax sprue observing the shortest
possible distance.
4. Investment with silicone
Cover the vestibular and palatal and/or lingual
surfaces of the contoured dentures with silicone. Do
not cover the occlusal surfaces and incisal edges of
the teeth. Apply a retentive pattern in the surface of
the silicone before it sets or use retention sand to
secure the silicone in the stone.
Note: For optimum results, the use of a flowable,
addition cross-linking silicone (A-silicone with a Shore-A
hardness of >65) is recommended (e.g. Flexistone Plus or
Virtual Heavy Body Fast).
Isolate stone-to-stone contact surfaces with
Separating Fluid (F).
5. Casting the counter model
Position the upper flask half and lock using the
locking clasps.
Mix conventional dental stone (Class III) according
to the instructions of the manufacturer and have it
flow in flowable consistency into the opening of the
flask without any air bubbles with the help of a
shaker. Skim off excess stone with the IvoBase
spatula so that no stone protrudes from the flask
opening.
6. Boiling out the model
Once the stone has entirely set, heat the flask in a
water bath at approximately 90 °C (194 °F) for
approximately 5–8 minutes. After that, open the
flask, remove the access former full and roughly
remove the wax using a wax knife. Now thoroughly
boil out the inner surfaces with clean, boiling water.
Note: Use only pure water without additives
(e.g. wax solvent, cleaning agent). Additives may result
in a discolouration of the dentures.