| The Japanese Dental Science Review | |
| Vol. 44 No. 1 2008 | |
| ISSN: 1882-7616 UBIC: 99 | |
| Summary | |
| Adhesive post core restorations using a combination of fiber reinforced posts (FRPs) and
resin composites have become the preferred choice worldwide in restoring pulpless teeth. The success of this method,
especially because of the low incidence of root fracture, has been shown in many clinical studies in several countries.
However, the method has also shown a tendency for the FRP to come detached from its post-space, and this potential
flaw raises questions about the long-term durable prognoses of such restorations. The adhesive characteristics of
post core materials to root canal dentin have been widely investigated as part of the attempt to find a solution
to the problem. Comprehensive understanding of the way that root canal dentin behaves in the post-space may be the
key to achieving their better adhesion. Clinicians have to contend with the high stresses produced in the post-space
because of its extremely high C-factor. When using light-cured and even dual-cured materials, ensuring deep
and complete light penetration is essential to obtain even bonding strength throughout the post space. Chemically
cured adhesive materials, where the progress of curing is relatively slow and there is less stress caused by polymerization
shrinkage, should be positively considered for the root canal bonding. In every case, careful attention needs
to be paid to the negative effects that endodontic irrigation solutions, such as sodium hypochlorite and EDTA,
have on root canal adhesion. Even after better adhesion of the FRP to root canal dentin has been achieved-and
proved by high-quality long-term clinical studies, the concept of cusp-coverage in pulpless molars may need to
be reconsidered based on a good conservative policy of minimal intervention. 2008 Japanese Association for Dental
Science. Published by Elsevier Ireland. Alt rights reserved.
Key words: Adhesion; Bonding; Post-core; Fiber reinforced post; Composite core. |
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