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Color changes in composites according to various light curing sources


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Color changes in composites according to various light curing sources

Article information

Restor Dent Endod. 2002;27(1):87-94
Publication date (electronic) : 2002 January 31
doi : https://doi.org/10.5395/JKACD.2002.27.1.087
Young-Gon Cho, Myung-Cho Kim
Department of Conservative Dentistry, College of dentistry, Chosun University, Korea.

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 60℃ 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 (ΔE*) 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 ΔE* values presented below 2.0.

3. Group I showed the highest ΔE* values followed order from highest to lowest by Group II and III (p<0.05).

Keywords: Color changes; Composite; Light curing sources

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Article information Continued

Copyright © 2002 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

Separable cylindrical metal mold for sample fabrication

Fig. 2

Fig. 2

Diagram of the CIE L*, a*, b* color space

Fig. 3

Fig. 3

Graphic representating of mean microhardness values(VHN) of each group

I: Apollo 95E, II: XL 3000, III: Spectrum 800

Fig. 4

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℃

Fig. 5

Fig. 5

Total color difference(ΔE*) in group I, II and III

I: Apollo 95E, II: XL 3000, III: Spectrum 800

Table 1

Light curing units used in this study

Table 1

Table 2

Microhardness values(VHN) of upper surfaces and lower surfaces of each group(Mean±SD)

Table 2

I: Apollo 95E , II: XL 3000, III: Spectrum 800

*: Statistically significant difference between groups (p < 0.05)

Table 3

Result of color changes of group I, II and III after storing for 30 days in distilled water at 60℃ expressed as means

Table 3

ΔL*, Δa*, Δb*, ΔC*: color difference, ΔE*: total color difference.

I: Apollo 95E, II: XL 3000, III: Spectrum 800

Standard deviations are in parentheses. *: significant differences (p<0.05)