Duc Olivier, Di Bella Enrico, Krejci Ivo, Betrisey Emilie, Abdelaziz Marwa, Ardu Stefano
Division of Cariology and Endodontology, Section of Dental Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland.
Department of Economics and Quantitative Methods, University of Genoa, Genoa, Italy.
Am J Dent. 2019 Feb;32(1):39-42.
To evaluate the color stability of three resin-based materials continuously exposed to various staining agents.
144 disc-shaped specimens were made of each of the three tested composites (Essentia, Brillant, Inspiro). Half of them were 1 mm thick, the other half 1.2 mm thick. The thicker group was then polished up to 4,000 grit and reduced to 1 mm thickness, also. All specimens, after 24-hour dry storage in an incubator, received an initial color measurement by means of a calibrated reflectance spectrophotometer (SpectroShade). Specimens were then divided into six groups (n=6) and immersed in five staining solutions or artificial saliva (control). All specimens were kept in an incubator at 37°C for 28 days. Staining solutions (red wine, curry mixed in water, curry mixed in oil, tea and coffee) were changed every 7th day to avoid bacteria or yeast contamination. After 28 days of storage, spectrophotometric measurements were repeated and Lab* scores once more recorded to determine the color (ΔE00) changes.
All tested materials showed significant color changes after 28 days staining immersion. ΔE00 of polished samples varied from 1.1 (Essentia/distilled water measured over a white background as well as Essentia, Inspiro/distilled water measured over a black background) to 32.5 (Inspiro/wine measured over a white background).
Staining of restorative materials seems to be dependent on the composition of the product itself. Unpolished samples were more prone to staining than the polished ones.
评估三种树脂基材料持续暴露于各种染色剂后的颜色稳定性。
用三种测试复合材料（Essentia、Brillant、Inspiro）分别制作144个圆盘形试件。其中一半厚度为1毫米，另一半厚度为1.2毫米。然后将较厚的一组打磨至4000目并也减至1毫米厚度。所有试件在培养箱中干燥储存24小时后，使用校准反射分光光度计（SpectroShade）进行初始颜色测量。然后将试件分为六组（n = 6），并浸入五种染色溶液或人工唾液（对照）中。所有试件在37°C的培养箱中保存28天。每隔7天更换染色溶液（红酒、水溶咖喱、油溶咖喱、茶和咖啡）以避免细菌或酵母污染。储存28天后，重复分光光度测量并再次记录Lab*值以确定颜色（ΔE00）变化。
所有测试材料在染色浸泡28天后均显示出显著的颜色变化。打磨后样品的ΔE00值从1.1（Essentia/在白色背景上测量的蒸馏水以及Essentia、Inspiro/在黑色背景上测量 的蒸馏水）到32.5（Inspiro/在白色背景上测量的红酒）不等。
修复材料的染色似乎取决于产品本身的成分。未打磨的样品比打磨后的样品更容易染色。
