Ivoclar Vivadent CosmoPost - Manual (Page 11)

11
1. Indirect method
Important
In the indirect method, the impression posts allow you to
take impressions quickly and easily. In addition, you can
use them as temporary posts in provisional restorations.
Observe safety precautions when working with
hydrofluoric acid.
A. Preparation of the tooth / root canal
If luting composites (eg Variolink II System) are used, the
application of a hydrophilic 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. Stop about 4 mm from the apex (eg Gates-
Glidden or Peeso from Brasseler).
– Select the suitable post size (observe the above indications
and contraindications).
– Prepare the canal lumen with standardized CosmoPost root
canal burs.
– Try in the impression post. Make sure that the post fits
tightly in the canal without being able to move.
– Prepare the remaining tooth structure.
– No undercuts
– A defined insertion path of the core build-up must be
observed in remaining dentition.
– Prepare an inlay cavity in the pulp chamber.
– Place a retraction cord if necessary.
– Take an impression of the core including the impression
post with an addition cross-linked impression material,
using the double mix or single phase technique.
– Take an impression of the antagonist jaw in order to
determine the coronal height of the build-up.
– Fabricate a resin temporary with the help of the impression
post.
Important:
The tooth should not be subjected to masticatory or
parafunctional loading while the temporary restoration
is in place.
B. Fabrication of the build-up in the
dental laboratory
Provide the dental technician with clear instructions
regarding the fabrication of the build-up (occlusal distance to
the antagonist, circular chamfer, convergence of the build-
up, etc). The root post is supplied in sandblasted form and
should not be additionally prepared in the dental laboratory.
After divesting the post and the build-up, only the build-up
should be sandblasted. The Instructions for Use for dental
technicians provide a detailed description of the fabrication
of the post build-up.
C. Try-in of the post build-up
– Remove the temporary and clean the core, eg with a
polishing brush and pumice or prophylactic paste (eg
Proxyt).
– Try in the post build-up.
– The post build-up should be positioned in the root canal in
its defined position without leaving any visible gaps.
D. Conditioning of the post build-up
– Condition the entire ceramic build-up with hydrofluoric
acid (IPS Ceramic Etching Gel):
– Apply the gel with a brush and let it react for 1 minute.
Rinse with water and dry. If the hydrofluoric acid is
accidentally spilled on the post, the quality of the post is
not compromised.
– Silanize the contact surface of the ceramic build-up with
Monobond S. Apply the liquid with a brush and let it react
for 1 minute. Blow off excess.
– Apply Heliobond on the contact surface of the build-up
using a brush. Disperse with blown air. Do not light cure.
– Store the conditioned build-up in a container protected
from light (eg Vivapad with cover).