الفهرس 
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Abstract
The present investigation was undertaken to study invitro the effect of topical 2% sodium fluoride application to the enamel surface before bonding of the orthodontic brackets with two direct bonding materials namely; chemically-curing (Lee Unique) and ultraviolet-curing (Nuva System). This was performed on freshly exteacted bicuspids using stainless steeel orthodintic brackets welded on a mesh gauze pad.