Abstract
Statement of problem
Light transmitted deep into the root canal is an important parameter to increase bonding
of the cement to the post and dentin. Glass fiber posts seem to be an option to increase
transmitted light, but literature on the light transmittance profile and power transmission
to deep canal regions is lacking.
Purpose
The purpose of this in vitro study was to evaluate light delivered by 2 types of fiberglass
posts submitted to different surface treatments and to evaluate the bond strength.
Material and methods
Whiteposts and Superposts were allocated to 4 groups: no surface treatment, surface
treatment with 24% hydrogen peroxide, surface treatment with silane, and surface treatment
with 24% hydrogen peroxide plus silane. The total light transmitted by the posts was
measured by using an integrating sphere to collect the diffuse light. The light profile
that was laterally delivered to the post was measured with a power detector equipped
with an optical fiber probe. The bond strength was measured with the push-out test.
Scanning electron microscopy was used to evaluate the surface treatments. The light
transmission data were analyzed by using a generalized linear model and the Bonferroni
test and the bond strength values were evaluated by using ANOVA and the Tukey test
(α=.05).
Results
The cervical third presented the highest transmission (74.1% for Whiteposts and 74.6%
for Superposts), followed by the middle (20.9% for Whiteposts and 20.4% for Superposts)
and apical (5.0% for both Whiteposts and Superposts) thirds. Superposts led to higher
bond strength than Whiteposts (9.73 ±5.89 and 8.48 ±4.99 MPa, respectively). Surface
treatment with silane and hydrogen peroxide plus silane afforded similar bond strength
(11.4 ±6.4 and 10.7 ±5.6 MPa, respectively), which was higher as compared with the
bond strength obtained after surface treatment with hydrogen peroxide. For both post
types, the bond strength decreased from the cervical (12.2 ±6.0 MPa) to the middle
(9.7 ±5.0 MPa) and apical (6.5 ±3.6 MPa) thirds.
Conclusions
Light transmission and bond strength decreased from the cervical to the apical third.
Surface treatment impacted bond strength; light transmission through Whiteposts was
slightly higher than light transmission through Superposts.
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Article info
Publication history
Published online: January 08, 2021
Footnotes
Supported by the Fundação de Amparo a Pesquisa do Estado de São Paulo (grant number 2011/07960-4 and 2013/07276-1).
Identification
Copyright
© 2020 by the Editorial Council for the Journal of Prosthetic Dentistry.
