Restor Dent Endod.  2023 Feb;48(1):e7. 10.5395/rde.2023.48.e7.

Effects of surrounding and underlying shades on the color adjustment potential of a single-shade composite used in a thin layer

• Barros MS
• Silva PFD
• Santana MLC
• Bragança RMF
• Faria-e-Silva AL

• KMID: 2548175
• DOI: http://doi.org/10.5395/rde.2023.48.e7

Abstract

Objectives
This study aimed to evaluate the surrounding and underlying shades’ effect on the color adjustment potential (CAP) of a single-shade composite used in a thin layer.
Materials and Methods
Cylinder specimens (1.0 mm thick) were built with the Vittra APS Unique composite, surrounded (dual specimens) or not (simple specimens) by a control composite (shade A1, A2, or A3). Simple specimens were also built only with the control composites. Each specimen’s color was measured against white and black backgrounds or the simple control specimens with a spectrophotometer (CIELAB system). The whiteness index for dentistry (WI_D ) and translucency parameters (TP 00 ) were calculated for simple specimens. Differences (ΔE₀₀ ) in color between the simple/dual specimens and the controls were calculated. The CAP was calculated based on the ratios between data from simple and dual specimens.
Results
The Vittra APS Unique composite showed higher WI_D and TP₀₀ values than the controls. The highest values of ΔE₀₀ were observed among simple specimens. The color measurements of Vittra APS Unique (simple or dual) against the control specimens presented the lowest color differences. Only surrounding the single-shade composite with a shaded composite barely impacted the ΔE₀₀ . The highest CAP values were obtained using a shaded composite under simple or dual specimens.
Conclusions
The CAP of Vittra APS Unique was strongly affected by the underlying shade, while surrounding this composite with a shaded one barely affected its color adjustment.

Keyword

Color; Composite resins; Dental materials; Dental restoration, Permanent; Esthetics, Dental

Figure

• 

  Figure 1 Schematic illustration showing the specimens` arrangement to calculate color differences. The actual color difference (yellow arrow: ΔE00_1) among the composites was calculated by comparing the color of simple specimens built with shaded composites and with a single shade over a black background. Comparing the color of dual specimens with the shaded composites over a black background estimated the surrounding shade effect (orange arrow: ΔE00_2*surrounding). The effect of the background (green arrow: ΔE00_2*underlying) was estimated by comparing simple specimens of the shaded composites with those of the single shade. Finally, the combined impact of the background and surrounding shades (red arrow: ΔE00_2*both) was calculated by the color difference between shaded composites and dual specimens measured over the shaded backgrounds.

• 

  Figure 2 Mean values (with standard deviations) for the values of ΔE00 calculated for different comparisons and composite shades. For all shades, ΔE00_1 > ΔE00_2*surrounding > ΔE00_2*underlying = ΔE00_2*both. Irrespective of the calculation arrangement, A3 > A2 > A2. The dashed horizontal line indicates the 50:50% acceptability threshold.

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  Figure 3 Mean values (with standard deviations) of color adjustment potentials calculated for different composite shades and the locations where these shades were placed. For all shades, underlying = both > surrounding. The shade did not affect the color adjustment potential values.

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