| Summary: | Recent times have increased in awareness about facial esthetic within the
general populance. Patients approach the dentist for orthodontic treatment might
have already had their teeth bleached or might be interested in bleaching.
Nightguard bleaching various commercialy available product containing 10-35%
carbamide peroxide are available. This study was to determine the effect of
bleaching gel containing 10%, 15%, 20% and 35% carbamide peroxide (CP) on
the shear bond strength and tensile strength of brackets bonded with resinreinforced
glass ionomer cement.
The sample group consisted of 105 premolars, equally divided into five
different groups, four bleaching agents and a placebo. The agents were applied for
7 days on the buccal surface, 10 hours per day for carbamide peroxide 10%, 6
hours per day for carbamide peroxide 15%, 4 hours per day for carbamide
peroxide 20% and 30 minutes per day for carbamide peroxide 10%. Shear bond
strength and tensile bond strength was measured using Pearson Panke Equipment,
the residual adhesive was assesed using Olympus Microscope. The surface
morphology before and after treatment was assesed using a Scanning Electron
Microscope.
The result higher concentration of bleaching agent no significant decrease
shear bond strength and tensile bond strength of orthodontic brackets, the higher
values were measured in control group. ARI score comparisons indicated no
significant differences among the five group. SEM analysis showed significantly
altered enamel superficial morphology. Conclusions: Because bleaching
application affected shear bond strengths of orthodontic brackets on human
enamel, they should be delayed until the completion of orthodontic treatment.
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