The present study has been taken-up to evaluate the effect of topical
fluoride varnish application on enamel surface and the effect of the same on
the shear strength of orthodontic bracket bonding. Methods:- 120 extracted
premolar teeth without any decay or visible defect were collected from the
Department of Oral and Maxillofacial surgery, Farooqia Dental College and
Hospital, Mysore Karnataka. These 120 orthodontic bracket bonded to premolars
were subjected to the shear bond strength. The teeth were divided into control
group, Duraphat varnish group, Varnish 3M group, ClearShieldTM group. The
samples were tested on day 1, 8 and15. The samples were coated with their
respective varnish, followed by bonding of brackets using ENLIGHT light cure
adhesive system. Each specimen was subjected to shear force on universal
testing machine until the bracket gets deboned and the same of 120 specimens
were subjected to Adhesive Remnant Index test. The whole data was analysed
using ANOVA analysis. Results:- At day 1 the mean shear bond strength of
ClearShieldTM group has shown a significant difference from other groups.
Whereas at day 8 and 15 Duraphat varnish group had significantly higher range
of shear bond strength. The shear bond strength in comparison to all groups in
all days has shown no significance. ARI scores for the same specimens, has no
significant difference in mean in between the groups. Conclusion:- The
application of fluoride varnish, irrespective of the time interval between
fluoride treatment and bonding procedure, does not affect the shear bond
strength. Adhesive Remnant Index test has shown no significance in all groups.
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