Korean J Orthod.  2018 Nov;48(6):377-383. 10.4041/kjod.2018.48.6.377.

Colorimetric evaluation of white spot lesions following external bleaching with fluoridation: An in-vitro study

• Choi YY
• Lee DY
• Kim YJ

• KMID: 2427775
• DOI: http://doi.org/10.4041/kjod.2018.48.6.377

Abstract

OBJECTIVE
This study was performed to investigate the effects of external tooth bleaching with flouridation on the appearance of white spot lesions (WSLs) in vitro.
METHODS
In total, 125 bracket-bonded bovine incisor enamel blocks with artificial WSLs were randomly divided into a control group and four treatment groups (home bleaching, home bleaching + fluoridation, in-office bleaching, and in-office bleaching + fluoridation). A spectroradiometer (SR) and digital images (DIs) were used to evaluate colorimetric parameters (Commission Internationale l'Eclairage L*a*b*) for all specimens. Color measurements were obtained before WSL formation (T1), after WSL formation (T2), and after completion of the external tooth bleaching treatment (T3).
RESULTS
The SR-based color change after bleaching was significantly greater in the treatment groups than in the control group (p < 0.05). SR-based lightness (L*) and red-green (a*) values were significantly higher at T2 than at T1 (p < 0.001), with no significant changes in yellow-blue (b*) values. At T3, SR-based L* values had increased while a* and b* values had decreased in the treatment groups (p < 0.001). The DI-based color difference between the sound enamel and WSL areas (ΔE*DI) increased significantly from T1 to T2 in all groups (p < 0.001) and significantly decreased from T2 to T3 in the treatment groups (p < 0.001). No significant differences in ΔE*DI at T3 were shown between the four treatment groups (p > 0.05).
CONCLUSIONS
The findings of this study suggested that external tooth bleaching with fluoridation can alleviate the conspicuity of WSLs.

Keyword

White spot lesions; External tooth bleaching; Fluoride

MeSH Terms

Dental Caries*
Dental Enamel
Fluoridation*
Fluorides
In Vitro Techniques
Incisor
Tooth Bleaching
Fluorides

Figure

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  Figure 1 Bovine enamel blocks with bonded orthodontic brackets (red dot indicates the distogingival aspect) prepared for colorimetric evaluation of white spot lesions following external bleaching with or without fluoridation. The blue area describes the area covered with nail varnish. The brackets and nail varnish were absent at the time of spectroradiometer analysis and digital image acquisition. A, The green circle represents the area of measurement by the spectroradiometer. B, The green circles (P1, sound enamel area; P2, white spot lesion area) describe the areas of measurements by Photoshop after the acquisition of digital images.

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