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. 2025 Mar 18;25(1):402.
doi: 10.1186/s12903-024-05233-2.

Effect of opalescence in resin-based dental composites on the active color matching ability

Joseph Chang  1 , Bum-Soon Lim  1 , Shin Hye Chung  2 , Wonjoon Moon  3
Affiliations

Effect of opalescence in resin-based dental composites on the active color matching ability

Joseph Chang et al. BMC Oral Health. .

Abstract

Objective: This study aims to evaluate the influence of opalescence in the color matching ability of dental composites.

Methods: Single-disc samples were prepared using 10 commercially available composites (6 conventional, 3 simplified-shade, and 1 single-shade). Dual-color samples were created using Omnichroma, Ceram.X Sphere TEC (A3 shade), and DenFil (B2/C2 shade), with various cavity diameters in the center, which were then filled with the aforementioned 10 composites. Additionally, single-color samples were prepared using the 4 base composites mentioned above. The ΔESingle-Dual were calculated as differences between single and dual samples. The color coordinates (CIE L*a*b*) of the samples were measured using a spectrophotometer. The results of translucency parameters (TP) and opalescence parameters (OP) of the 10 composites were compared with ΔE measurement samples.

Results: TP and OP generally had a linear correlation, and ΔESingle-Dual mostly increased with cavity diameter. Regarding the correlation between ΔESingle-Dual and TP, little correlation was observed in the conventional composite bases, but higher correlations were observed in the simplified- or single-shade composite bases. Regarding the correlation between ΔESingle-Dual and OP, inverse correlations were observed in the conventional composite bases and simplified composite bases, but the single-shade composite base showed the linear correlations with OP.

Conclusions: These findings highlight a potentially greater role for opalescence in the color matching ability of dental composites than previously acknowledged.

Keywords: Color difference; Color matching ability; Opalescence; Resin composite; Shade; Translucency.

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Conflict of interest statement

Declarations. Consent for publication: Not applicable. Competing interests: The authors declare no competing interests.

Figures

Fig. 1
Fig. 1
Schematic diagram of sample measurement
Fig. 2
Fig. 2
Correlation between OP and TP
Fig. 3
Fig. 3
Color difference (ΔESingle-Dual) as a function of cavity diameter: (a) Omnichroma, (b) G-aenial Universal Injectable, (c) Solare Sculpt, (d) Tetric N-Ceram
Fig. 4
Fig. 4
Correlation between color difference (ΔESingle-Dual) and translucency parameter (TP) with various resin composite bases and cavity sizes: (a) DenFil B2 base, (b) DenFil C2 base, (c) Ceram.X Sphere TEC (simplified-shade) A3 base, (d) Omnichroma (single-shade)
Fig. 5
Fig. 5
Correlation between color difference (ΔESingle-Dual) and opalescence parameter (OP) with various resin composite bases and cavity sizes: (a) DenFil B2 base, (b) DenFil C2 base, (c) Ceram.X Sphere TEC (simplified-shade) A3 base, (d) Omnichroma (single-shade)
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