J Korean Acad Conserv Dent.  2003 May;28(3):195-202. 10.5395/JKACD.2003.28.3.195.

Color changes in composite resins exposed to xenon lamp

• Cho YG
• Seo JI
• Kim SM
• Jeong JH
• Lee YG

• KMID: 2175580
• DOI: http://doi.org/10.5395/JKACD.2003.28.3.195

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 37degrees C for 1 day and 7 days. Group II: exposure of xenon lamp to the specimens in the air at 37degrees C for 1 day and 7 days. Group III: exposure of xenon lamp to the specimens in distilled water at 37degrees C 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 (DeltaE*) were computed. The results obtained were as follows: 1. In all groups except A1 shade of group III, the DeltaE* values presented below 2.0, and group III showed the highest DeltaE* 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.

Keyword

Xenon lamp; Color change; Composite resin; Color characteristics; Color difference; Spectrophotometer

MeSH Terms

Aluminum
Composite Resins*
Darkness
Fungi
Water
Xenon*
Aluminum
Composite Resins
Water
Xenon

Figure

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  Fig. 1 CIE L*a*b* color space illustrates chromaticity (a*,b*) and lightness (L*) coordinates measured by chromameter.

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  Fig. 2 Color changes (ΔL*,Δa*, and Δb*) of group I after 1 day of xenon lamp exposure.

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  Fig. 3 Color changes (ΔL*,Δa*, and Δb*) of group II after 1 day of xenon lamp exposure.

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  Fig. 4 Color changes (ΔL*,Δa*, and Δb*) of group III after 1 day of xenon lamp exposure.

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  Fig. 5 Color changes (ΔL*,Δa*, and Δb*) of GroupI after 7 days of xenon lamp exposure.

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  Fig. 6 Color changes (ΔL*,Δa*, and Δb*) of group II after 7 days of xenon lamp exposure.

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

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