Amir Saad Thesis final revision 03x - IUPUI

PURPOSE OF THIS INVESTIGATION
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This investigation was undertaken to gain more information on composite
resin core behavior combined with glass fiber posts and Panavia 21 for crown
cementation (under cyclic loading). It is hypothesized that a glass fiber post combined
with a composite resin core and Panavia 21 for crown cementation would resist
marginal gap opening as good as or better than the other groups. This hypothesis is
based on the similarity of the elastic modulus of glass fiber posts to natural tooth
dentin 7, 87-92 combined with the adhesive effect of Panavia 21 to tooth structure,
silanated composite resin, and tin plated silver palladium alloy. Although it is known
that composite resin has a much lower elastic modulus than cast alloys 161 that would
tend to deform at lower cyclic stresses, the bonding system used in this glass fiber
group tested with Panavia 21 should eliminate marginal gap opening at the lingual
surface of bucally loaded, prepared teeth.
Another hypothesis being tested is that cast post and cores would demonstrate
higher load-to-failure values than the other groups tested. It is believed that the
strength of the casted silver palladium alloy with a good adaption of the post to the
canal space would render higher values of fracture resistance than the other groups.
Although this type of testing has been done before, 93 various parameters such as
ferrule length, root length, and cement used are different from other studies.