Statement of problem
The bond strength of composite resin cores to the smooth surface of prefabricated
zirconia-based ceramic posts is problematic because it might not be sufficient to
ensure stability of the post-and-core system. It is also not clear whether any alteration
of the post surface to provide additional mechanical or chemical retention would compromise
flexural strength of the posts.
Purpose
This study tested the effect of a tribochemical treatment on the bond strength (BS)
between zirconia-based ceramic posts and composite resin and on the flexural strength
(FS) of the posts.
Material and methods
For the BS test, 2 groups of specimens (n=10) were prepared as follows: In the experimental
(E) group, zirconia-based ceramic posts (Cosmopost), 21 mm long and 1.7 mm in diameter,
were treated with a tribochemical silica coating and silanization system (Rocatec).
For the control (C) group, zirconia-based ceramic posts were used as supplied by the
manufacturer. For the 2 groups, posts were centered and vertically positioned in a
metal mold, and composite resin (Tetric Ceram) was polymerized around the posts to
form rings (6 mm diameter × 4 mm height). All specimens were positioned in a universal
testing machine, and a load was applied axially on the protruding heads of posts in
a shear push-out mode test until bond failure (MPa). Fracture mode was assessed as
cohesive, cohesive/adhesive, or adhesive. Following this, the FS of the posts was
measured in MPa using a 3-point bending test. Data were recorded and statistically
analyzed using the Student t test for both tests (α=.01).
Results
Mean fracture load values ± SDs for the BS test were 28.1 ± 2.3 MPa and 8.9 ± 3.97
MPa for the E and C groups, respectively. The mean FS values were 1544.9 ± 214.1 MPa
and 844.8 ± 50.8 MPa for the E and C groups, respectively. The tribochemically treated
posts exhibited significantly higher values for both bond strength to composite resin
and resistance to fracture when compared to posts in the control group (P<.001). Fracture analysis showed 100% cohesive/adhesive fractures for group E specimens
and 100% adhesive fractures for group C specimens.
Conclusions
The use of a tribochemical silica coating process and silanization on zirconia-based
ceramic posts increased both the bond strength to composite resin as well as the fracture
strength of posts.
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Article info
Publication history
Bauru Dental School, University of Sao Paulo, Brazil
Footnotes
This study was supported by FAPESP, Sao Paulo, Brazil, grant number 01/10245-3.
Identification
Copyright
© 2006 The Editorial Council of The Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
