الفهرس 
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Abstract
Aim: The aim of this study was to evaluate the effect of a single application of Clinpro XT varnish on enamel demineralization adjacent to orthodontic brackets during fixed orthodontic treatment in comparison with acidulated phosphorus fluoride gel.
Methodology: Eighteen patients were seeking orthodontic treatment. They were selected from the out-patients clinic of the Orthodontic Department, Faculty of Dentistry, Cairo University. For each patient the maxillary anterior teeth (from canine to canine) were divided into right and left sides. The two sides were randomly divided into two groups: group I (54): Teeth were treated by Clinpro XT. group II (54): Teeth were treated with Acidulated Phosphorus Fluoride gel which was assessed immediately before application (T0), after three months (T1) and after six months (T2) application. The outcome of treatment was assessed by color change using spectrophotometer and patient satisfaction using Visual Analogue Scale (VAS).
Results: a statistically insignificant difference in the color change was found between the intervention and comparator groups after 3 months of the beginning of orthodontic
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treatment while the difference between the 2 groups was statistically significant after 6 months. Regarding the VAS scale results there was statistically significant difference between the 2 groups at both 3-month and 6-month follow up period.
Conclusion: According to the results of the present study, the following conclusions could be drawn, Clinpro XT varnish outperformed acidulated Phosphorus Fluoride gel in preventing white spot lesions during orthodontic treatment hence it is recommended to be used as a preventive material at 6-month of administration.