J Am Dent Assoc. 2024 Jul;155(7):605-613. doi: 10.1016/j.adaj.2024.03.006. Epub 2024 May 31.
The color adjustment potential of resin composites depends on the specific characteristics of the surrounding structures. The authors evaluated the influence of cavity wall thickness on CIEDE2000 color adjustment potential (CAP) of single-shade composites using the CIEDE2000 color difference (ΔE) formula.
Two types of specimens were produced: single, using Vittra APS color DA3 (FGM Dental), Vittra APS Unique (VU) (FGM Dental), and Omnichroma (Tokuyama Dental) composites; and dual, using Vittra APS color DA3, but with cavity wall thicknesses of 3, 2, or 1 mm, restored with VU or Omnichroma. CIEL∗a∗b∗ color coordinates were obtained from digital photographs of the specimens at different locations, and ΔE and CAP were calculated. Statistical analysis included 2-way analysis of variance, Kruskal-Wallis, Holm-Sidak, Student-Newman-Keuls, Wilcoxon signed rank, and paired t tests (α = 5%).
Cavity walls 1-mm-thick had higher ΔE values and lower CAP values, particularly for VU (P < .05). Restorations matched better with the control at the periphery than the central area (P < .001). Overall ΔE means exceeded the color perceptibility threshold (ie, 0.8) and the acceptability threshold (ie, 1.8). Color differences (between center of restoration and control composite) were moderately unacceptable for 3-mm and 2-mm thicknesses and extremely unacceptable for 1-mm thickness. Both composites had a ΔE color shift predominately determined by means of the lightness difference. Positive CAP values were found for VU and Omnichroma.
Wall thickness, especially at 1 mm, negatively impacted the color of single- shade composites. This effect was more pronounced for VU, affecting mainly the restoration's central area.
Color matching ability depends on the structural and material characteristics, and clinicians should be attentive to these factors when using single-shade resin composites.
树脂复合材料的颜色调整潜力取决于周围结构的特定特征。作者使用 CIEDE2000 色差公式（ΔE）评估了腔壁厚度对单色调复合材料 CIEDE2000 颜色调整潜力（CAP）的影响。
制作了两种类型的标本：一种是使用 Vittra APS 颜色 DA3（FGM Dental）、Vittra APS Unique（VU）（FGM Dental）和 Omnichroma（Tokuyama Dental）复合材料的单色调；另一种是双色调，使用 Vittra APS 颜色 DA3，但腔壁厚度为 3、2 或 1 毫米，用 VU 或 Omnichroma 修复。从不同位置的标本的数字照片中获得 CIEL∗a∗b∗颜色坐标，并计算 ΔE 和 CAP。统计分析包括 2 因素方差分析、Kruskal-Wallis 检验、Holm-Sidak 检验、Student-Newman-Keuls 检验、Wilcoxon 符号秩检验和配对 t 检验（α=5%）。
1 毫米厚的腔壁具有更高的 ΔE 值和更低的 CAP 值，特别是对于 VU（P<0.05）。修复体在边缘处与对照物的匹配度优于中央区域（P<0.001）。总体 ΔE 平均值超过了颜色可察觉阈值（即 0.8）和可接受阈值（即 1.8）。3 毫米和 2 毫米厚度的颜色差异（修复体中心与对照复合之间）为中度不可接受，1 毫米厚度的颜色差异为极不可接受。两种复合材料的 ΔE 颜色移位主要由明度差决定。发现 VU 和 Omnichroma 具有正的 CAP 值。
壁厚度，特别是 1 毫米，对单色调复合材料的颜色有负面影响。这种影响对于 VU 更为明显，主要影响修复体的中央区域。
颜色匹配能力取决于结构和材料特性，临床医生在使用单色调树脂复合材料时应注意这些因素。
