Color changes in composite resins exposed to xenon lamp

Young-Gon Cho; Jeong-Il Seo; Soo-Mee Kim; Jin-Ho Jeong; Young-Gon Lee

doi:10.5395/JKACD.2003.28.3.195

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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; Journal of Korean Academy of Conservative Dentistry 2003;28(3):195-202.
DOI: https://doi.org/10.5395/JKACD.2003.28.3.195
Published online: May 31, 2003

Department of Conservative Dentistry, College of dentistry, Chosun University, Korea.

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

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Abstract
REFERENCES

Abstract

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.
Keywords: Xenon lamp; Color change; Composite resin; Color characteristics; Color difference; Spectrophotometer

REFERENCES

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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.

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)

Tables & Figures

REFERENCES

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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

DOI: https://doi.org/10.5395/JKACD.2003.28.3.195

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Figure

Color changes in composite resins exposed to xenon lamp

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.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Color changes in composite resins exposed to xenon lamp

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)

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).