J Korean Acad Conserv Dent.  2002 Jan;27(1):87-94. 10.5395/JKACD.2002.27.1.087.

Color changes in composites according to various light curing sources

• Cho YG
• Kim MC

• KMID: 2175551
• DOI: http://doi.org/10.5395/JKACD.2002.27.1.087

Abstract

The purpose of this study was to evaluate the color changes of composite resin polymerized with three type of light curing units. Composite resin (Z100, shade A2) were applied in a cylindrical metal mold(2 mm thick, 7 mm diameter). Twenty specimens according to light curing units were made. Group1: the specimens were polymerized with Apollo 95E for 3seconds(1370 mW/cm2). Group2: the specimens were polymerized with XL 3000 for 40seconds(480 mW/cm2). Group3: the specimens were polymerized with Spectrum 800 for 10 seconds(250 mW/cm2) and 30 seconds(700 mW/cm2). The microhardness values(VHN) of upper and lower surfaces specimens after light polymerization were measured for the degree of polymerization. All specimens were stored in distilled water at 60degrees C for 30 days. The color characteristics(L*, a*, b*) of the specimens before and after immersion were measured by spectrophotometer and the total color difference (DeltaE*) was computed. The results obtained were as follows: 1. The microhardness values of Group I showed significantly lower than those of Group II and III(p<0.05). 2. In all groups the DeltaE* values presented below 2.0. 3. Group I showed the highest DeltaE* values followed order from highest to lowest by Group II and III (p<0.05).

Keyword

Color changes; Composite; Light curing sources

MeSH Terms

Immersion
Light
Polymerization
Polymers
Water
Polymers
Water

Figure

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  Fig. 1 Separable cylindrical metal mold for sample fabrication

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  Fig. 2 Diagram of the CIE L*, a*, b* color space

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  Fig. 3 Graphic representating of mean microhardness values(VHN) of each group I: Apollo 95E, II: XL 3000, III: Spectrum 800

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  Fig. 4 Graphic representation of the chromatic color changes of group I, II and III produced by storing for 30 days in distilled water at 60℃

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  Fig. 5 Total color difference(ΔE*) in group I, II and III I: Apollo 95E, II: XL 3000, III: Spectrum 800

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