Metamerism in composite resins under five standard illuminants - D65, A, C, FCW and TL84

Ki-Jeong Park; Yun-Chan Hwang; Sun-Ho Kim; Won-Mann Oh; In-Nam Hwang

doi:10.5395/JKACD.2003.28.5.402

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Original Article Metamerism in composite resins under five standard illuminants - D₆₅, A, C, FCW and TL84: Ki-Jeong Park, Yun-Chan Hwang, Sun-Ho Kim, Won-Mann Oh, In-Nam Hwang; 2003;28(5):-408.
DOI: https://doi.org/10.5395/JKACD.2003.28.5.402
Published online: September 30, 2003

Department of Conservative Dentistry, College of Dentistry, DSRI, Chonnam National University, Korea.

Corresponding author (hinso@jnu.ac.kr)

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Abstract
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Abstract

This study was done to present a criterion in selection of the most proper light sources and materials by measuring metamerism index(MI) of the light curing composite resins with spectrocolorimeter. Metamerism is defined when two objects appear to be the same color in one illuminant but different in another. This is due to the fact that they have different spectral curves that fail to match under the second illuminant.

In this study, A1 & A3 shade of five light curing composite resins (Esthet-X, Filteck Z250, Filteck A110, Charisma, Vitalescence) were chosen based on Vita shade. Five samples were made for shade of each product with Teflon mold (diameter: 15mm, thickness: 2mm).

Metamerism index of each samples on a Barium sulfate plate (L*=96.54, a*=0.19, b*=0.01) prepared for sample fixation were measured with spectrocolorimeter(Miniscan XE plus, Model 4000s, Hunter Lab, USA) by applying standard light source D₆₅, C, Fcw, TL84 and A. Standardization was done with reference standard (X=80.8, Y=85.7, Z=90.8) and light trap. The results were as follows.
1. Different resins with same Vita shade showed recognizable color difference(ΔE*>2).
2. All composites had MI below accepted value 0.5 between standard illuminant(D₆₅, C, & A) and below 1.5 under fluorescent condition (Fcw & TL84).
3. MI value between D₆₅ and A showed higher value than MI value between other source of light(p<0.01).
4. All resins except Z250 showed MI value that A3 is higher than A1 between D₆₅ and A(p<0.05).
Keywords: Metamerism index; Enamel shade composite; Standard illuminant D₆₅, A, C

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Fig. 1

L^* and C^* value of the tested composite resins.

Fig. 2

a^* and b^* value of the tested composite resins.

Fig. 3

Metamerism.

Fig. 4

Spectral Distribution of CIE standard illuminants.

Table 1

Products, shade, and manufacturers of tested composite resins

Table 2

CIE L^*a^*b^* and C^* values of 5 composite resins under D₆₅

Table 3

Metamerism index (MI) of the tested composite resins measured under combination of illuminants with D₆₅

Tables & Figures

REFERENCES

Citations

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Metamerism in composite resins under five standard illuminants - D₆₅, A, C, FCW and TL84

J Korean Acad Conserv Dent. 2003;28(5):402-408. Published online September 30, 2003

DOI: https://doi.org/10.5395/JKACD.2003.28.5.402

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Figure

Metamerism in composite resins under five standard illuminants - D₆₅, A, C, FCW and TL84

Fig. 1 L* and C* value of the tested composite resins.

Fig. 2 a* and b* value of the tested composite resins.

Fig. 3 Metamerism.

Fig. 4 Spectral Distribution of CIE standard illuminants.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Metamerism in composite resins under five standard illuminants - D₆₅, A, C, FCW and TL84

Table 1

Products, shade, and manufacturers of tested composite resins

Table 2

CIE L^*a^*b^* and C^* values of 5 composite resins under D₆₅

Table 3

Metamerism index (MI) of the tested composite resins measured under combination of illuminants with D₆₅

Table 1 Products, shade, and manufacturers of tested composite resins

Table 2 CIE L*a*b* and C* values of 5 composite resins under D65

Table 3 Metamerism index (MI) of the tested composite resins measured under combination of illuminants with D65