Abstract:
The bond strength of adhesives to dentin have been shown to be affected by
a number of different factors, including intrinsic properties of the prepared
dentin, various types of contamination and the chemical composition of the adhesive
agent. The present study investigates the microtensile bond strength (μTBS)
of two different bonding systems at different dentinal areas of primary dentin
after saliva contamination. Caries-free primary molars were randomly divided
into four groups (n = 10) for μTBS. Prime and Bond NT (etch-and-rinse)
and Clearfil Protect Bond (two step self-etch) adhesives were tested under the
following conditions: (a) control, (b) contamination with saliva prior to adhesive
application. Following adhesive and composite superstructure application μTBS
was measured. Maximum load at failure (N) was recorded and converted to MPa.
Statistical analysis was carried out using one-way ANOVA with Tukey’s
test. No statistically significant difference was found between the μTBS
of the contaminated and control groups in the central region of primary dentin
for either adhesive system tested (p>0.05). However, saliva contamination
resulted in significant reductions in bond strength in the peripheral region
(p<0.05) for both adhesive systems tested. In the saliva contaminated groups,
μTBS was higher in the central region than in the peripheral region. The
etch and rinse adhesive performed better than the two-step self-etching adhesive
under saliva contamination in both the peripheral and central regions of primary
dentin. Results indicate that saliva contamination should be avoided when restoring
primary teeth with proximal cavities using both Prime and Bond NT (etch and
rinse) and Clearfil Protect Bond (two step self-etch) adhesives. However, confirmatory
studies are needed before conclusive recommendations can be made for clinical
practice.
Ayca T. Ulusoy and Seval Olmez, 2012. Effect of Saliva Contamination on the Bond Strength of Dentin Adhesives to Central and Peripheral Primary Dentin in vitro. European Journal of Dentistry and Medicine, 4: 26-33.
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