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The color change in artificial white spot lesions measured using a spectroradiometer

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Abstract

Objectives

The purpose of this study was to determine the color of white spot lesions.

Materials and methods

Human premolars were subjected to a pH cycling to produce artificial caries lesions and classified into groups (n = 10/group): group 1, immersion in deionized water; group 2, pH cycling without fluoride (F) application; group 3, pH cycling with immersion in 1,000 ppm NaF solution; and group 4, pH cycling with immersion in 5,000 ppm NaF solution. CIE L*a*b* color parameters of the tooth were determined using a spectroradiometer at baseline, after demineralization and after pH cycling. The extent of demineralization was evaluated by scanning electron microscopy (SEM) and electron microprobe analysis (EPMA).

Results

Significant degrees of color change (ΔE*) were observed after demineralization (p < 0.05). The changes were mainly due to an increase in lightness (L*) and a decrease in yellowness (b*). F application induced a significantly large ΔE* in group 4 (p < 0.05). The color reversal after remineralization was mostly due to the recovery of L*. SEM and EPMA verified that net mineral gains occurred in the subsurface lesions.

Conclusions

The initially white appearance of enamel caries was a result of changes of L* and b*. F treatment partially restored the color of white spot lesions.

Clinical relevance

F-driven remineralization induced both mineral gains and esthetic enhancement of artificially produced enamel white spot lesions. The increase of L* and the decrease of b* contributed to the color changes.

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Conflicts of interest

The authors declare that they have no conflicts of interest.

Author information

Authors and Affiliations

  1. Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea

    Younju Kim & Ho-Hyun Son

  2. Geochronology Team, Korea Basic Science Institute, Daejeon, South Korea

    Keewook Yi

  3. Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, South Korea

    Hae-Young Kim

  4. Department of Dental Biomaterials Science, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea

    Jinsoo Ahn

  5. Clinic for Persons with Disabilities, Seoul National University Dental Hospital, Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehak-no, Jongno-gu, Seoul, 110-768, South Korea

    Juhea Chang

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  1. Younju Kim
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  2. Ho-Hyun Son
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  3. Keewook Yi
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  4. Hae-Young Kim
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Corresponding author

Correspondence to Juhea Chang.

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Kim, Y., Son, HH., Yi, K. et al. The color change in artificial white spot lesions measured using a spectroradiometer. Clin Oral Invest 17, 139–146 (2013). https://doi.org/10.1007/s00784-012-0680-x

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  • DOI: https://doi.org/10.1007/s00784-012-0680-x

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