Statement of problem
There is a lack of information comparing the effect of a rigid versus flexible post
on the marginal seal of post-and-core supported crowns subjected to long-term repeated
loading.
Purpose
The purpose of this study was to examine the leakage pattern of complete coverage
restorations retained with either a metal or fiber-reinforced resin post under simulated
occlusal loads.
Material and methods
Thirty-six maxillary central incisors were endodontically treated and provided with
a post-and-core supported crown. One group was restored with a fiber-post (EasyPost
Lux) and another was restored with a metal post (Parapost) (n=12). Both groups were
loaded for 120 000 cycles to 70 N while immersed in a dye solution. A control group
(n=12), similarly restored with a fiber post but not loaded, was also included. All
teeth were transversely sectioned serially from the tooth-core interface towards the
apex. Digital photographs were made to determine the extent of leakage on the buccal,
mesial, palatal, and distal aspects along the depth of the post. A nonparametric Kruskal-Wallis
test was used to determine any difference between groups (α=.05).
Results
Dye penetration occurred in all stress-cycled specimens and was more extensive on
the palatal than other aspects. The fiber-post group cyclically stressed to 70 N showed
a significantly greater amount of leakage than the control or the Parapost group (P<.05).
Conclusions
In in vitro testing, the rigidity of the post influenced the seal of post-and-core-supported
crowns at the palatal margin.
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© 2012 The Editorial Council of the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
