الفهرس 
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Abstract
To compare color change after resin infiltration of artificially demineralized enamel lesion: of different severity, measured by a clinical spectrophotometer versus polarized digital photography.
60 Sound human premolars were collected in this study, they were randomly divided into 3 groups. Each tooth had been coated with a coat of clear nail varnish, leaving a 5×5mm2 window on the labial surface. For demineralization, all the teeth have been immersed in a demineralizing solution of a pH adjusted to 4.4 at 37 °C.
Three level of demineralization have been obtained (shallow, moderate, deep) according to the demineralization time. The demineralized area was then infiltrated by low viscosity resin ICON® (DMG, Hamburg, Germany).
Two instrumental methods were utilized to assess the color difference, first by using a clinical spectrophotometer VITA Easyshade® V (VITA Zahnfabrik, Germany) and second by digital photography.
Spectrophotometric measurements were taken 4 times to obtain the averaged CIE L*A*B values. The DSLR camera was used for cross-polarized digital photography. Images were taken with the same exposure settings then imported to the adobe Photoshop software to measure the CIE L*A*B values. Color difference (∆E00) were calculated using the CIEDE2000 formula between sound and demineralized enamel (∆E1) and between sound and resin infiltrated enamel (∆E2).
There was a statistically significant difference in the color difference of different severities of demineralized lesions before and after resin infiltration (D3>D2>D1). There is no difference in color change between sound and resin infiltrated enamel using clinical spectrophotometry and digital photography in shallow and moderate demineralized lesions, while in deeper lesions clinical spectrophotometry tends to detect higher color change compared to digital photography.
Within the limitations of this in vitro study, the following conclusions could be suggested:
1. Demineralization level is inversely proportional to color correction after resin infiltration.
2. Clinical spectrophotometer and digital photography can detect difference in color change similarly in shallow and moderate demineralization, however in deep demineralization digital photography gives more accurate representation of color parameter unlike the clinical spectrophotometer which gives readings that are higher than the actual color change.
3. Lightness is the color parameter that contribute to most of the color change.
Recommendations: -
We recommend further investigations to clinically correlate the objective color measurement with subjective visual color perception and to evaluate the need for modifying the resin infiltration technique especially in deeply demineralized lesions.