Ivoclar Vivadent CosmoPost - Manual (Page 15)

15
The root canal post is supplied sandblasted. Further
preparation or silanization is unnecessary. If the root post is
contaminated, for example, with saliva during the try-in
procedure, it should be cleaned with commercially available
37% phosphoric acid (eg Total Etch). Apply the gel to the
CosmoPost, rinse and dry.
Retention grooves must not be applied to the CosmoPost under any circumstances.
2. Direct method
Important
The post must not be adjusted by grinding under any
circumstances. Retention grooves must not be applied.
Such measures may result in predetermined breaking
points on the post. However, shortening the post with
suitable diamond burs is possible.
Important
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.
A. Preparation of the tooth / root canal
If luting composites (eg Variolink II System) are used, the
application of a hydrophylic dentin primer in the canal is
recommended to facilitate the adaptation of the composite
to the canal walls. We recommend using the components of
the Syntac Classic or Excite DSC dentin bonding systems in
combination with Variolink II.
– Remove the coronal part of the root filling using the root
canal reamer (e.g. Gates-Glidden or Peeso from Brasseler).
Stop about 4 mm before the apex.
– Select the adequate size of the post (observe the above
indications and contraindications).
– Prepare the canal lumen with standardized instruments.
– Try in the post.
– Ensure adequate relative isolation. Prevent contamination
with saliva. If possible, use a rubber dam.
– 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. Let
the material react for 15 seconds.
– Dry the canal with paper points.
– Wet the canal walls with Syntac Adhesive using a brush.
Disperse the adhesive with blown air and let it react for
10 seconds.
– Dry the canal with paper points.
When using Excite DSC:
– Etch as described above.
– Wet the canal walls with Excite DSC for 15 seconds using
an endodontic brush.
– Dry the canal with paper points.
Cementation:
– Mix Variolink II base and catalyst in a 1:1 ratio and apply
the mixture to the root canal post. Insert the post into the
root canal with pumping movements to prevent air from
being trapped. The working time of Variolink II is approx
4 minutes as of the beginning of mixing (at 37 °C / 98 °F).
– Remove excess cement in the coronal region with a brush.
Apply slight pressure on the post to hold it in place in the
canal.
– Continue applying slight pressure on the post and cure
Variolink II in the area of the cement border with a
polymerization light for 60 seconds each from the buccal
and oral.