الفهرس 
. IntroductionOnly 14 pages are availabe for public view
 |  | from | 95 |  |  |
| | | from | 95 | | |
Abstract
This study was conducted to compare the effect of three different surface treatments on color stability of artificial white spot lesions. In total, 65 bovine specimens were randomly assigned into five groups (n=13) according to the surface treatment performed; no treatment, polished enamel, resin infiltration, CPP-ACP, and artificial saliva. After preparation of bovine teeth, artificial white spot lesion was created in the middle of the buccal surface for the groups subjected to treatment and the no treatment group. Specimens were subjected to three surface treatments: resin infiltrant (ICON®), CPP-ACP (GC Tooth Mousse®) and artificial saliva. Then, all specimens were immersed in a coffee solution for eight weeks. Color measurements using spectrophotometer were done before immersion in coffee and after two, four and eight weeks of immersion. At each stage, a digital photograph was taken for a representative specimen from each group. Additionally, a sample for each group was prepared to be studied under polarized light microscopy after surface treatment.
Mean and standard deviation for color change (ΔE) of all the specimens were calculated. Two-way mixed ANOVA revealed a significant effect of surface treatment, time of immersion, and their interaction on color change of artificial white spot lesions. Different surface treatments revealed a significant effect on the color change of artificial white spot lesions. Resin infiltration group (ICON®) showed the least color change followed by CPP-ACP and polished enamel. Different times of immersion also showed a statistical significant increase of color change values starting at two weeks, followed by four weeks; reaching the highest color change value at 8 weeks after immersion in staining solution.