Ivoclar Vivadent CosmoPost - Manual (Page 9)

9
Instructions for Use
for dentists
Length of the post and preparation
It is essential that
During the preparation of the remaining tooth structure and
the contouring of the build-up, make sure that the build-up
is provided with sufficient retentive surface around the
entrance of the root canal: incorporation of an anti-rotation
device in the form of a canal inlay or retention box or
inclusion of a stable dentin lamella.
When preparing the core, the preparation margin must be located at least 2–3 mm below the build-up in
the residual dentin.
The preparation margin must be located 2–3 mm below the build-up.
– the coronal length of the post within the canal at least
corresponds to the coronal length of the prosthetic
restoration;
– the post demonstrates adequate mechanical friction in
the canal.
Important
If this procedure is not possible, a metal post must be
used, since the risk of a post fracture is clearly increased.
A fractured post most often results in the extraction of
the root, since the post is virtually impossible to remove.
The adequate length of the post within the canal must be observed.
Prof. Dr. Dipl.-Ing. E.-J. Richter, Würzburg, Germany.
The length of the post within the canal must at least correspond to the coronal length of the prosthetic
restoration.
Adequate length is particularly important for maxillary
anteriors, since the shearing forces in this area are very high
and may result in a loss of retention of the post build-up.
at least 2–3 mm
prosthetic crown
post build-up
root canal post (CosmoPost)
apical root filling