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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Cho, Seo, Kim, Jeong, and Lee: Color changes in composite resins exposed to xenon lamp

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2003; 28(3): 195-202.

Published online: 31 May 2003

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

Color changes in composite resins exposed to xenon lamp

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

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

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

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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:

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

Figures and Tables

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)

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