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Color changes in composite resins exposed to xenon lamp


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Color changes in composite resins exposed to xenon lamp

Article information

Restor Dent Endod. 2003;28(3):195-202
Publication date (electronic) : 2003 May 31
doi : https://doi.org/10.5395/JKACD.2003.28.3.195
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)

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

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Article information Continued

Copyright © 2003 Korean Academy of Conservative Dentistry
(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.

Fig. 1

Fig. 1

CIE L*a*b* color space illustrates chromaticity (a*,b*) and lightness (L*) coordinates measured by chromameter.

Fig. 2

Fig. 2

Color changes (ΔL*,Δa*, and Δb*) of group I after 1 day of xenon lamp exposure.

Fig. 3

Fig. 3

Color changes (ΔL*,Δa*, and Δb*) of group II after 1 day of xenon lamp exposure.

Fig. 4

Fig. 4

Color changes (ΔL*,Δa*, and Δb*) of group III after 1 day of xenon lamp exposure.

Fig. 5

Fig. 5

Color changes (ΔL*,Δa*, and Δb*) of GroupI after 7 days of xenon lamp exposure.

Fig. 6

Fig. 6

Color changes (ΔL*,Δa*, and Δb*) of group II after 7 days of xenon lamp exposure.

Fig. 7

Fig. 7

Color changes (ΔL*,Δa*, and Δb*) of group III after 7 days of xenon lamp exposure.

Table 1

Group classification.

Table 1

Table 2

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

Table 2

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.

Table 3

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).

Table 4

*: 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).

Table 5

*: significant differences (p<0.05)