Doray P G, Wang X, Powers J M, Burgess J O
Department of Restorative Dentistry, University of Pennsylvania, School of Dental Medicine, Philadelphia, USA.
J Prosthodont. 1997 Sep;6(3):183-8. doi: 10.1111/j.1532-849x.1997.tb00088.x.
The color stability of two shades each of five acrylic resin and seven resin composite provisional restorative materials was evaluated by reflection spectrophotometry following in vitro accelerated aging.
Specimens of provisional restorative materials were polymerized according to manufacturers' instructions and aged in an artificial aging chamber with exposure to a total ultraviolet irradiation of 60 kJ/m2. Color was measured by CIE Lab* on a reflection spectrophotometer before and after aging. Color change (delta E*) was calculated and analyzed statistically.
Statistically significant changes in color were observed after accelerated aging. Nine of the 12 provisional materials tested showed perceptible color change of at least one of the shades tested. The most color-stable materials were the acrylic, Alike, and the resin composites, Luxatemp and Protemp Garant, which had no perceptible color changes under these conditions.
Some acrylic resin and composite provisional materials change color significantly and perceptibly when exposed to in vitro accelerated aging conditions.
通过体外加速老化后的反射分光光度法，评估五种丙烯酸树脂和七种树脂复合材料临时修复材料的两种色号的颜色稳定性。
临时修复材料标本按照制造商说明进行聚合，并在人工老化箱中老化，暴露于总紫外线辐射量为60 kJ/m²的环境下。老化前后使用反射分光光度计通过CIE Lab测量颜色。计算颜色变化（ΔE）并进行统计学分析。
加速老化后观察到颜色有统计学上的显著变化。测试的12种临时材料中有9种在所测试的至少一种色号上表现出明显的颜色变化。颜色最稳定的材料是丙烯酸树脂Alike以及树脂复合材料Luxatemp和Protemp Garant，在这些条件下没有明显的颜色变化。
一些丙烯酸树脂和复合临时材料在体外加速老化条件下会发生显著且明显的颜色变化。
