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HOME > Restor Dent Endod > Volume 28(3); 2003 > Article
Original Article Color changes in composite resins exposed to xenon lamp
Young-Gon Cho, Jeong-Il Seo, Soo-Mee Kim, Jin-Ho Jeong, Young-Gon Lee
2003;28(3):-202.
DOI: https://doi.org/10.5395/JKACD.2003.28.3.195
Published online: May 31, 2003

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Corresponding author (ygcho@mail.chosun.ac.kr)

Copyright © 2003 Korean Academy of Conservative Dentistry

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  • The purpose of this study was to evaluate the color changes of the composite resin resulting from xenon lamp exposure in different environments. Composite resin (Z 250 ; shade A1, A2, A3, A3.5, and A4) were applied in a cylindrical metal mold. Seventy five specimens according to environments of exposure were made as follows;
    Group I: aluminum foiling of the specimens in the air at 37℃ for 1 day and 7 days.
    Group II: exposure of xenon lamp to the specimens in the air at 37℃ for 1 day and 7 days.
    Group III: exposure of xenon lamp to the specimens in distilled water at 37℃ for 1 day and 7 days.
    The color characteristics (L*,a*,b*) of the specimens before and after exposure of xenon lamp were measured by spectrophotometer and the total color differences (ΔE*) were computed.
    The results obtained were as follows:
    1. In all groups except A1 shade of group III, the ΔE* values presented below 2.0, and group III showed the highest ΔE* values followed by group II and group I in a decreasing order(p<0.05).

    2. In all shades and groups, the more the exposure time of xenon lamp and the lighter the shade were, the higher the tendency for discoloration (p<0.05).

    3. The composite resins which was exposed to xenon lamp in the distilled water was more discolored than those in the air (p<0.05).

    4. The major changes of composite resins which were exposed to xenon lamp in the air were an increase in yellowness through a positive shift of the b* value, and those in the distilled water were an increase in darkness and yellowness through a negative shift of the L* value and a positive shift of the b* value.

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Fig. 1
CIE L*a*b* color space illustrates chromaticity (a*,b*) and lightness (L*) coordinates measured by chromameter.
jkacd-28-195-g001.jpg
Fig. 2
Color changes (ΔL*,Δa*, and Δb*) of group I after 1 day of xenon lamp exposure.
jkacd-28-195-g002.jpg
Fig. 3
Color changes (ΔL*,Δa*, and Δb*) of group II after 1 day of xenon lamp exposure.
jkacd-28-195-g003.jpg
Fig. 4
Color changes (ΔL*,Δa*, and Δb*) of group III after 1 day of xenon lamp exposure.
jkacd-28-195-g004.jpg
Fig. 5
Color changes (ΔL*,Δa*, and Δb*) of GroupI after 7 days of xenon lamp exposure.
jkacd-28-195-g005.jpg
Fig. 6
Color changes (ΔL*,Δa*, and Δb*) of group II after 7 days of xenon lamp exposure.
jkacd-28-195-g006.jpg
Fig. 7
Color changes (ΔL*,Δa*, and Δb*) of group III after 7 days of xenon lamp exposure.
jkacd-28-195-g007.jpg
Table 1
Group classification.
jkacd-28-195-i001.jpg
Table 2
Result of color changes of group I, II and III after exposure of xenon lamp for 1 day.

ΔL*,Δa*,Δb*: color difference, ΔE*: total color difference.

Standard deviations are in parentheses.

jkacd-28-195-i002.jpg
Table 3
Result of color changes of group I, II and III after exposure of xenon lamp for 7 days.

ΔL*,Δa*,Δb*: color difference, ΔE*: total color difference.

Standard deviations are in parentheses.

jkacd-28-195-i003.jpg
Table 4
Statistical analysis of ΔE* of groupI between each shades by Tukey's HSD test (exposure to xenon lamp for 1 day).

*: significant differences (p<0.05)

jkacd-28-195-i004.jpg
Table 5
Statistical analysis of ΔE* of groupI between each shades by Turkey's HSD test (exposure to xenon lamp for 7 days).

*: significant differences (p<0.05)

jkacd-28-195-i005.jpg

Tables & Figures

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    • Effects of the color components of light-cured composite resin before and after polymerization on degree of conversion and flexural strength
      Ji-A Yoo, Byeong-Hoon Cho
      Journal of Korean Academy of Conservative Dentistry.2011; 36(4): 324.     CrossRef

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      Color changes in composite resins exposed to xenon lamp
      J Korean Acad Conserv Dent. 2003;28(3):195-202.   Published online May 31, 2003
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    Figure
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    Color changes in composite resins exposed to xenon lamp
    Image Image Image Image Image Image Image
    Fig. 1 CIE L*a*b* color space illustrates chromaticity (a*,b*) and lightness (L*) coordinates measured by chromameter.
    Fig. 2 Color changes (ΔL*,Δa*, and Δb*) of group I after 1 day of xenon lamp exposure.
    Fig. 3 Color changes (ΔL*,Δa*, and Δb*) of group II after 1 day of xenon lamp exposure.
    Fig. 4 Color changes (ΔL*,Δa*, and Δb*) of group III after 1 day of xenon lamp exposure.
    Fig. 5 Color changes (ΔL*,Δa*, and Δb*) of GroupI after 7 days of xenon lamp exposure.
    Fig. 6 Color changes (ΔL*,Δa*, and Δb*) of group II after 7 days of xenon lamp exposure.
    Fig. 7 Color changes (ΔL*,Δa*, and Δb*) of group III after 7 days of xenon lamp exposure.
    Color changes in composite resins exposed to xenon lamp

    Group classification.

    Result of color changes of group I, II and III after exposure of xenon lamp for 1 day.

    ΔL*,Δa*,Δb*: color difference, ΔE*: total color difference.

    Standard deviations are in parentheses.

    Result of color changes of group I, II and III after exposure of xenon lamp for 7 days.

    ΔL*,Δa*,Δb*: color difference, ΔE*: total color difference.

    Standard deviations are in parentheses.

    Statistical analysis of ΔE* of groupI between each shades by Tukey's HSD test (exposure to xenon lamp for 1 day).

    *: significant differences (p<0.05)

    Statistical analysis of ΔE* of groupI between each shades by Turkey's HSD test (exposure to xenon lamp for 7 days).

    *: significant differences (p<0.05)

    Table 1 Group classification.

    Table 2 Result of color changes of group I, II and III after exposure of xenon lamp for 1 day.

    ΔL*,Δa*,Δb*: color difference, ΔE*: total color difference.

    Standard deviations are in parentheses.

    Table 3 Result of color changes of group I, II and III after exposure of xenon lamp for 7 days.

    ΔL*,Δa*,Δb*: color difference, ΔE*: total color difference.

    Standard deviations are in parentheses.

    Table 4 Statistical analysis of ΔE* of groupI between each shades by Tukey's HSD test (exposure to xenon lamp for 1 day).

    *: significant differences (p<0.05)

    Table 5 Statistical analysis of ΔE* of groupI between each shades by Turkey's HSD test (exposure to xenon lamp for 7 days).

    *: significant differences (p<0.05)


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