Department of Prosthodontics, Baskent University Faculty of Dentistry, Ankara, Turkey.
J Prosthodont. 2010 Feb;19(2):118-24. doi: 10.1111/j.1532-849X.2009.00535.x. Epub 2009 Dec 3.
The purpose of this study was to investigate the effect of four solutions [saliva (control group), saliva+tea, saliva+coffee, saliva+nicotine] on the color of different denture base acrylic resins (heat-polymerized, injection-molded, autopolymerized) and a soft denture liner.
Twenty specimens from each type of test material were prepared (2.5 mm diameter, 2 mm thickness). Five specimens from each test material (heat-polymerized, chemically polymerized, injection-molded acrylic resin, soft denture reliner) were stored in each solution in 37 degrees C in a dark environment. Colorimetric measurements were done on the 1st, 7th, and 30th days. Color differences among specimens immersed in saliva (control group), and staining solutions were evaluated over time. Data were statistically analyzed with one-way analysis of variance (ANOVA) (alpha= 0.05). ANOVA was followed by Tukey test to find which groups differed from each other.
Significant color shifts occurred in heat-polymerized and injection-molded acrylic resins in coffee and in soft liner in nicotine over time (p < 0.05) (DeltaE > 1). The color shift of soft liner in nicotine was significantly different than that of the remainder of the test materials in nicotine (p < 0.05). The color shift magnitudes of each test material in coffee and tea were not significantly different when compared among the test material groups (p > 0.05).
The effect of staining solutions on the color of each test material in each session was perceivable by the human eye (DeltaE > 1); however, the color shifts of all test materials were clinically acceptable (DeltaE < 3.7) except for soft liner in nicotine, which was not clinically acceptable over time. Therefore, minimizing drinking of such beverages and use of tobacco, particularly when soft liner is applied, may be advantageous for denture wearers for long-term color stability.
本研究旨在探讨四种溶液[唾液（对照组）、唾液+茶、唾液+咖啡、唾液+尼古丁]对不同义齿基托树脂（热聚合、注塑、自聚合）和软衬料颜色的影响。
每种测试材料制备 20 个试件（直径 2.5mm，厚度 2mm）。将每个测试材料（热聚合、化学聚合、注塑亚克力树脂、软衬料）的 5 个试件分别浸泡在每种溶液中，在 37°C 的黑暗环境中储存。在第 1、7 和 30 天进行比色测量。评估浸泡在唾液（对照组）和染色溶液中的试件随时间的颜色差异。使用单向方差分析（ANOVA）（α=0.05）对数据进行统计分析。ANOVA 后进行 Tukey 检验，以确定哪些组彼此不同。
随着时间的推移，热聚合和注塑亚克力树脂在咖啡中以及软衬料在尼古丁中发生了显著的颜色变化（p<0.05）（DeltaE>1）。尼古丁中的软衬料颜色变化明显不同于尼古丁中其余测试材料（p<0.05）。与其他测试材料相比，尼古丁中的软衬料颜色变化幅度在统计学上差异显著（p<0.05）。然而，咖啡和茶中的每种测试材料在各测试材料组之间的颜色变化幅度没有显著差异（p>0.05）。
染色溶液对各测试材料在各阶段的颜色影响可被人眼察觉（DeltaE>1）；然而，除了软衬料在尼古丁中随时间推移颜色变化不可接受（DeltaE<3.7）外，所有测试材料的颜色变化均在临床可接受范围内。因此，义齿佩戴者长期保持颜色稳定性的最佳方法是尽量减少饮用此类饮料和使用烟草，特别是在应用软衬料时。
