Ivoclar Vivadent SR Ivocron - Manual (Page 6)

6
Mixing the Cervical material
Mix SR Ivocron Cervical material in a rubber cup, cover it
and let it sit for 2–3 minutes. The material is ready to use as
soon as it no longer sticks to the spatula.
Applying the Cervical material, pressing
Apply the mixed Cervical material on the exposed cervical
area and cover it with a plastic foil. Placed the preheated
second flask half on the first half, close the flask, and press
immediately. Pressure is approx. 1 ton, i.e., somewhat lower
than that needed for the incisal area. Allow to cool under
pressure.
Polymerization
Secure the flask in the clamping frame.
– Single crowns
Place in cold water, heat, and boil for 30 minutes. Allow
to cool slowly.
– Bridges
Preheat in water measuring 70° C (158 °F) for
30 minutes. Then, boil for 30 minutes, and allow to cool
slowly.
Finishing and polishing
Finish the restoration according to the standard procedure
for PMMA materials, i.e. finishing with burs and rubber
polishers, prepolishing with goat's hair brushes and pumice,
and polishing to a high gloss with cotton wool buffers and
polishing medium (e.g. Ivoclar Vivadent Universal Polishing
Paste).
Characterization
SR Ivocron Intensive powders are reactive polymers. They are
used for strong characterizations or for shade modifications
of Dentin, Cervical, or Incisal materials.
Depending on the type of the restorations, SR Ivocron
Intensive materials are mixed with Cold, Hot, or Press
Liquid. Make sure that the same liquid is used as for the
other materials. Small quantities of dry material may also be
applied and then wetted with monomer.
Summary of the most important data
Cold Technique
– Mixing ratio by volume
1 part polymer : 1 part monomer
– Mixing ratio in g
1 g polymer : 0.83 g monomer
– Dough time
3–4 minutes
– Working time at 23 °C (73 °F)
Approx. 8 minutes
– Polymerization
In the pressure apparatus at 2–6 bar pressure and
40–50 °C (104–122 °F) for 15 minutes
Hot Technique
– Mixing ratio by volume
1–1.5 parts polymer : 1.5 parts monomer
– Mixing ratio in g
1–1.5 g polymer : 1.25 g monomer
– Dough time
2–3 minutes
– Working time at 23 °C (73 °F)
Depending on the mixing ratio approx. 8–25 minutes
– Polymerization with model
In the pressure apparatus at 2–6 bar pressure and
100 °C (212 °F) for 25–30 minutes
– Polymerization without model
In the pressure apparatus at 2-6 bar pressure and 120 °C
(248 °F) for 10 minutes
Pressing Technique
Dentin and Cervical materials
– Mixing ratio by volume
2.5 parts polymer : 1 part monomer
– Mixing ratio in g
2.5 g polymer : 0.83 g monomer
– Dough time
2–3 minutes
– Working time at 23 °C (73 °F)
Approx. 8–10 minutes
Incisal material
– Mixing ratio by volume
2 parts polymer : 1 part monomer
– Mixing ratio in g
2 g polymer : 0.83 g monomer
– Dough time Incisal
3–4 minutes
– Working time at 23 °C (73 °F)
Approx. 8–10 minutes