Ivoclar Vivadent CosmoPost - Manual (Page 12)

12
Important
The Variolink II catalyst must be refrigerated, since storage
at room temperature compromises the quality of the
material. Nevertheless, Variolink II must be applied at
room temperature, otherwise the working time (setting
time) of the material is extended by approx 1 minute. The
behaviour of the material during light-curing does not
depend on the storage temperature.
Important
– Use only eugenol-free cements (eg Provilink), as eugenol
may inhibit the polymerization of the luting composite
– When using resin-based temporary cements (eg
Provilink), isolate the core with Vaseline, to remove the
temporary without any problems.
E. Cementation of the post build-up
– Place a retraction cord.
– Rinse the root canal (eg 5% sodium hypochloride) and dry
with paper points.
– Etch the root canal with 37% phosphoric acid (eg Total
Etch) for 10–15 seconds, rinse and dry with paper points.
Etching is optional when using Syntac Classic, but
compulsory when using Excite DSC.
When using Syntac Classic:
– Wet the canal walls with Syntac Primer using a brush,
respectively Endo Brush. Let the material react for
15 seconds.
– Dry the canal with paper points.
– Wet the canal walls with Syntac Adhesive using a brush,
respectively Endo Brush. Disperse with blown air and let
react for 10 seconds.
– Dry the canal with paper points.
When using Excite DSC:
– Etch as described above.
– Using an endodontic brush, wet the canal walls with
Excite DSC for 15 seconds.
– Dry the canal with paper points.
Cementation:
– Mix Variolink II base and catalyst in a 1:1 ratio. Apply this
mixture to the post and the contact surface of the build-up
and place the post build-up in the canal. The working time
of Variolink II is approx 4 minutes as of the beginning of
mixing (at 37 °C / 98 °F).
– Remove excess cement with a suitable brush. Use a flat
condenser to keep the post build-up in place.
– Continue applying slight pressure to the post build-up and
cure Variolink II in the area of the cement border with a
polymerization light for 60 seconds each from the buccal
and lingual and from the mesial and distal, if possible.
Given the translucency of the dentin and the post build-
up, the composite can be light cured up to a depth of
approx 2–3 mm.
F. Preparation and temporary restoration
– Prepare the build-up
– Take impression
– Place temporary restoration
– Make sure that the preparation margin is located approx
2–3 mm below the build-up.