الفهرس 
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Abstract
Caries teeth are a well-recognized source of pain and discomfort, and when it strikes, toothache is distressing for the child and is disruptive for other family members. Therefore, the prevention of caries in children and adolescents is considered as a priority and cost-effective than its treatment.
The purpose of this study is to compare the effect of using Er,Cr:YSGG laser, and Sodium Fluoride gel 2% on the color change of the white spot lesions of the primary teeth.
A total of thirty-nine freshly extracted, primary anterior were used in this study and were divided into three groups, thirteen specimens in each group according to the type of treatment used. The root portion of each tooth was cut at 1 mm below the cementoenamel junction, and each crown was bisected by a diamond disk in a mesiodistal direction and mounted on acrostone acrylic resin. The whole block was painted with a double layer of nail varnish and leaf 4*4 mm square window was placed on the labial surface.
All specimens were subjected to color evaluation by spectrophotometry (baseline examination, T0), and then immersed in the demineralizing solution for 96 h to create an artificial white spot lesion, then color evaluation was performed again (demineralization stage, T1).
Remineralization was done in group A with 2% NaF gel, group B was irradiated for 10 seconds with an Er,Cr:YSGG via the following settings: Wave Length=2,780 nm; Power=0.50 Watt; pulse energy=12.5 mJ; repetition rate=20 Hz; pulse duration=140 microsecond; 11% air; and 0% water, group C was treated with a thin layer of 2% NaF gel for 4 min, and then irradiated with the Er, Cr:YSGG laser for 10 seconds without removing the gel and left undisturbed for 2 min.
All specimens were stored in artificial saliva, and after 24 hours color was evaluated (remineralization stage, T2). All the specimens were restored in artificial saliva that was changed every 48 hours.
After the 30-day interval, color measurement was carried out, and L, a, and b values were recorded again (final measurement, T3).
The results of the present study showed a significant improvement in the color of white spot lesions in all groups treated. The highest value was found in the fluoride & laser group (3.88±0.18), followed by the fluoride group (2.79±0.18) while the lowest value was found with laser group (1.89±0.13).