Background and surrounding colors affect the color blending of a single-shade composite

Abstract This study evaluated the background and effect of surrounding colors on the color blending of a single-shade composite used in a thin layer. Disc-shaped specimens (1.0 mm thickness) were built with the Vittra APS Unique composite surrounded (dual specimens) or not surrounded (simple specimens) by a control composite (shade A1, A2, or A3). Simple specimens were also built with only control composites. The specimen color was measured against white and black backgrounds with a spectrophotometer (CIELAB system). The whiteness index for dentistry (WID) was calculated for simple specimens. Differences (ΔE00) in color and translucency parameters (ΔTP00) between the simple/dual specimens and the controls were calculated. The translucency adjustment potential (TAP) and color adjustment potential (CAP) were estimated based on the ratios between data from simple and dual specimens. The Vittra APS Unique composite showed higher WID values than the controls. No differences between ΔTP00_SIMPLE and ΔTP00_DUAL were observed for any of the shades. The composite shade did not affect TAP values. The lowest values of ΔE00_SIMPLE and ΔE00_DUAL were observed for shade A1 regardless of the background color. For the white background, ΔE00_SIMPLE values did not differ from those of ΔE00_DUAL for all shades. Only A1 showed ΔE00_DUAL values lower than ΔE00_SIMPLE when the black background was used. The highest modulus of CAP (negative values for the white background) was observed when shade A1 surrounded the Vittra APS Unique composite. The color blending ability of the single-shade resin composite used in a thin layer was affected by both the surrounding shade and background color.

摘要 本研究评估了背景色与周围颜色对薄层使用的单色调复合树脂色彩混和效果的影响。制备厚度为1.0 mm的盘状试样：采用Vittra APS Unique复合树脂，分别设置以色号为A1、A2或A3的对照复合树脂包裹（双试样组）或不包裹（单纯试样组）的组别；同时制备仅使用对照复合树脂的单纯试样。采用分光光度计（spectrophotometer）基于CIELAB系统，在白色与黑色背景下测量试样的色彩参数。针对单纯试样组，计算牙科用白度指数（whiteness index for dentistry, WID）。计算单纯试样组、双试样组与对照组之间的色彩色差（ΔE00）与半透明度参数差（ΔTP00）。基于单纯试样组与双试样组的检测数据比值，估算半透明度调节潜能（translucency adjustment potential, TAP）与颜色调节潜能（color adjustment potential, CAP）。结果显示，Vittra APS Unique复合树脂的WID值高于对照组。所有色号的ΔTP00_SIMPLE与ΔTP00_DUAL均无显著差异。复合树脂色号对半透明度调节潜能值无显著影响。无论背景色为何，色号A1组的ΔE00_SIMPLE与ΔE00_DUAL值均为最低。在白色背景下，所有色号的ΔE00_SIMPLE与ΔE00_DUAL值均无显著差异；仅当使用黑色背景时，色号A1组的ΔE00_DUAL值低于ΔE00_SIMPLE。当Vittra APS Unique复合树脂被色号A1的复合树脂包裹时，颜色调节潜能的模量最高（白色背景下为负值）。薄层使用的单色调树脂复合材料的色彩混和能力受周围树脂色号与背景色的共同影响。