Department of Operative Dentistry, School of Health Sciences, Faculty of Dentistry, University of Athens, Athens, Greece.
Public Health Doctoral Programs, School of Health Sciences, College of Health Sciences, Walden University, Minneapolis, Minnesota, USA.
J Esthet Restor Dent. 2021 Mar;33(2):323-340. doi: 10.1111/jerd.12610. Epub 2020 Jul 16.
To investigate the color difference using both ΔE* and CIEDE2000 formulas of all combinations of all enamel and dentin shades of three different composite systems with three different shade guides, to compare the coverage error (CE) of the shade guides for each composite and to investigate whether coverage error is affected by enamel shade layer thickness (0.5 vs 1 mm).
Disk specimens from all enamel and dentin shades of Essentia, Enamel Plus HRi, and IPS Empress Direct composites were fabricated. Color measurements were performed for all enamel-dentin combinations and for two thicknesses per enamel shade: 0.5 and 1 mm. Color was measured for three shade guides: Vitapan Classical, 3DMaster, and Ivoclar. Minimum color difference between layered composites and shade tabs, closest shade tab match and CE of all shade guides were calculated for all composite shade combinations.
In most cases, the closest match was a mismatch. CE of 3DMaster was significantly lower for IPS Empress Direct and Enamel Plus HRi at 0.5 mm enamel thickness. Shade guides exhibited higher lightness values compared to composites and composites lower chroma values compared to shade guides.
Shade guides do not match well to the layered composites. 3DMaster performed better than the other two shade guides, in most cases.
使用 ΔE* 和 CIEDE2000 公式研究三种不同复合体系的所有釉质和牙本质色调组合的色差，比较每种复合体系的比色指南的覆盖误差（CE），并研究覆盖误差是否受釉质色调层厚度（0.5 与 1mm）的影响。
制作了 Essentia、Enamel Plus HRi 和 IPS Empress Direct 复合材料的所有釉质和牙本质色调的圆盘试件。对所有釉质-牙本质组合以及每个釉质色调的两种厚度（0.5 和 1mm）进行了颜色测量。使用了三种比色指南：Vitapan Classical、3DMaster 和 Ivoclar。计算了所有复合色调组合的分层复合材料和比色片之间的最小色差、最接近的比色片匹配和所有比色指南的 CE。
在大多数情况下，最接近的匹配是不匹配。在 0.5mm 釉质厚度时，3DMaster 对 IPS Empress Direct 和 Enamel Plus HRi 的 CE 明显较低。与复合材料相比，比色指南具有更高的明度值，而与比色指南相比，复合材料具有更低的彩度值。
比色指南与分层复合材料不匹配。在大多数情况下，3DMaster 的性能优于其他两种比色指南。
