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HOME > Restor Dent Endod > Volume 32(5); 2007 > Article
Original Article Influence of the labial surface irregularity on the measurement of the tooth color by spectrometer
Yong-Jin Choi, Su-Jung Park, Hyun-Gu Cho, Yun-Chan Hwang, Won-Mann Oh, Byung-Ju Park1, In-Nam Hwang
2007;32(5):-418.
DOI: https://doi.org/10.5395/JKACD.2007.32.5.411
Published online: September 30, 2007

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Corresponding Author: In-Nam Hwang. Department of Conservative Dentistry, School of Dentistry, Chonnam National University 5 Hak-dong, Dong-gu, Gwangju, 501-757, Korea. Tel: 82-62-220-4443, Fax: 82-62-225-8387, hinso@jnu.ac.kr
• Received: June 16, 2007   • Revised: July 7, 2007   • Accepted: July 31, 2007

Copyright © 2007 Korean Academy of Conservative Dentistry

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  • The most scientific and reliable method for deciding the tooth color is the instrumental measurement. However, such color measuring instrument shows the difference of the measuring value according to the diversified measuring condition.
    This study was conducted to evaluate what effect of the labial surface irregularity of the tooth to the result of the color measured by spectrometer.
    11 models of the teeth were made by injecting the A2 shade Luxatemp Automix Plus (DMG, Germany) into the impression acquired from 11 adults. Standard disk samples (15 mm diameter, 7 mm thickness) were made with same material. CIE L*a*b* value was measured at the incisal, central, and gingival area of the central incisor, lateral incisor, canine and first premolar using Specbos 2100 (JETI, Germany) spectrometer. Color difference was calculated between labial surface and standard samples.
    Among all models of the teeth, L* and b* value showed the reducing tendency as they go toward the gingival area, but a* value showed the increasing tendency.
    Color difference between model teeth and standard samples showed the most difference at the incisal area, but the gingival area showed the least difference. And the canine showed the least color difference from the comparison of standard sample, and the central incisor showed the highest difference (p < 0.01).
    Although the visually detectable difference of the measuring value showed notably depending on the type and measured area (p < 0.05), L* and a* value showed notable differences depending more on the measured areas than on the type of the teeth.
  • Keywords: Tooth color; Spectrometer; Labial surface irregularity; CIE L*a*b*; Color difference; Tooth color measurement
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Figure 1
Diagram of the Duplex-Fiber bundle.
jkacd-32-411-g001.jpg
Figure 2
L* and C* value of the tested disc samples and tooth models.
CI : Central incisor, LI : Laterial Incisor, Ca : Canine, P : Premolar, I : Incisal, M : Middle, C : Cervical
jkacd-32-411-g002.jpg
Figure 3
a* and b* value of the tested disc samples and tooth models.
jkacd-32-411-g003.jpg
Table 1
CIE L*a*b* and C* values of disc samples and tooth models

Standard deviations are in parentheses.

jkacd-32-411-i001.jpg
Table 2
Statistical analysis between tooth and measured area
jkacd-32-411-i002.jpg
Table 3
Color difference (ΔE*) between disc sample and tooth models
jkacd-32-411-i003.jpg
Table 4
Color difference among measured area

*There are statistically significant differences among groups (p < 0.01).

jkacd-32-411-i004.jpg

Tables & Figures

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    • A Study on Digital Color Reproduction for Recording Color Appearance of Cultural Heritage
      Hyeong Rok Song, Young Hoon Jo
      Journal of Conservation Science.2022; 38(2): 154.     CrossRef

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      Influence of the labial surface irregularity on the measurement of the tooth color by spectrometer
      J Korean Acad Conserv Dent. 2007;32(5):411-418.   Published online September 30, 2007
      DOI: https://doi.org/10.5395/JKACD.2007.32.5.411
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    Influence of the labial surface irregularity on the measurement of the tooth color by spectrometer
    Image Image Image
    Figure 1 Diagram of the Duplex-Fiber bundle.
    Figure 2 L* and C* value of the tested disc samples and tooth models. CI : Central incisor, LI : Laterial Incisor, Ca : Canine, P : Premolar, I : Incisal, M : Middle, C : Cervical
    Figure 3 a* and b* value of the tested disc samples and tooth models.

    Figure 1

    Figure 2

    Figure 3

    Influence of the labial surface irregularity on the measurement of the tooth color by spectrometer

    CIE L*a*b* and C* values of disc samples and tooth models

    Standard deviations are in parentheses.

    Statistical analysis between tooth and measured area

    Color difference (ΔE*) between disc sample and tooth models

    Color difference among measured area

    *There are statistically significant differences among groups (p < 0.01).
    Table 1 CIE L*a*b* and C* values of disc samples and tooth models

    Standard deviations are in parentheses.

    Table 2 Statistical analysis between tooth and measured area

    Table 3 Color difference (ΔE*) between disc sample and tooth models

    Table 4 Color difference among measured area

    *There are statistically significant differences among groups (p < 0.01).

    Table 1

    Table 2

    Table 3

    Table 4

    Restor Dent Endod : Restorative Dentistry & Endodontics
    © The Korean Academy of Conservative Dentistry.
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