الفهرس 
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Abstract
The aim of this study was to evaluate the masking effect of the resin infiltrant on white spot lesions in comparison with other techniques (remineralization with nano-hydroxyapatite toothpaste and microabrasion) over different time intervals (0 month, 1 month, 3 months and 6 months). WSLs were artificially created on the buccal enamel surfaces of sixty human maxillary premolars and randomly assigned to equal four groups (n=15 each): nano-HA toothpaste, microabrasion (opalusture), resin infiltrant (Icon) treatment, or artificial saliva (control group). The color change (ΔE) of each specimen was measured by dental spectrophotometer (Vita Easyshade) at different time points: baseline, after WSLs’ creation, after application of treatments, one month, three and six months after treatments application. The results revealed that ΔE value did not differ significantly for the four groups at baseline measurement before treatment (p > 0.05). Icon resin infiltrant improved the color of WSLs significantly immediately after its application, giving the lowest ΔE value (3.00±0.59) when compared to other treatments (p < 0.001). There were no significant changes in ΔE for all groups during the follow up intervals (one month, three and six months) after treatments application (p > 0.05). Conclusions Taking in considerations the limitations of the present in-vitro study, it can be concluded that: Resin infiltrant can effectively mask the whitish color of white spot lesions and restore the natural appearance of enamel more than nano-hydroxyapatite toothpaste and microabrasion. The improvement obtained in color and esthetics by the application of resin infiltrant is stable for long periods.