Ivoclar Vivadent CosmoPost - Manual (Page 16)

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B. Direct modelling of the build-up
Model the build-up on the cemented root canal post using a
suitable posterior composite (eg Tetric Ceram). Apply layers
of 2–3 mm only. Light-cure each layer for 60 seconds.
Example of the direct method
Starting point:
Partial loss of the remaining coronal tooth structure
Situation after crown preparation
CosmoPost in situ
C. Preparation and temporary restoration
– Prepare the build-up. The preparation margin must be
located 2–3 mm below the build-up in the residual dentin.
– Take the impression.
– Place the temporary restoration.
D. Adhesive cementation of the
restoration
Preparation of the core and the remaining tooth structure:
– Remove the temporary and clean the core, eg with a polis-
hing brush and pumice or prophylactic paste (eg Proxyt).
– Ensure adequate relative isolation. Contamination with sali-
va must be prevented.
– Etch enamel areas with 37% phosphoric acid (eg Total
Etch) for 15–30 seconds. Then rinse and dry. Depending on
the dentin bonding system used, the dentin may also be
etched. Etching is optional when using Sytnac Classic, but
compulsory when using Excite DSC.
– Silanize the composite build-up: Apply Monobond S on the
build-up and let it react for 60 seconds. Disperse with
blown air.
When using Syntac Classic:
– Apply Syntac Primer on the enamel and dentin. Let it react
for 15 seconds and blow dry with air.
– Apply Syntac Adhesive on the enamel and dentin. Let react
for 10 seconds and blow dry with air.
– Apply Heliobond on the enamel, dentin and build-up and
blow to a thin layer; do not light-cure.
When using Excite DSC:
– Etch with 37% phosphoric acid (eg Total Etch): enamel for
15–30 seconds, dentin for 10-15 seconds. Then, rinse and
dry.
– Apply Excite DSC on the enamel, dentin and build-up and
agitate it onto the surfaces for 15 seconds. Disperse to a
thin layer using an air syringe; do not light-cure.
Preparation of the restoration:
Condition the IPS Empress restoration according to the
instructions and insert with Variolink II. For a detailed
description of this procedure, please refer to the Instructions
for Use / Technique Guide of the Variolink II System.
Important
– Use only eugenol-free cements (eg Provilink, since
eugenol may inhibit the polymerization of the luting
composite.
– When using resin-based temporary cements (eg
Provilink), isolate the core with Vaseline to prevent the
cement from chemically bonding with the composite
build-up.