Oral Health Prev Dent. 2024 Sep 12;22:459-464. doi: 10.3290/j.ohpd.b5740315.
Resins composites are widely used in modern dentistry because of their aesthetic and physical properties. However, discoloration of anterior tooth restorations is a common complaint. Understanding the factors affecting the colour stability of resin composites can lead to longer-lasting repairs. This study aimed to evaluate and compare the colour changes of nanocomposite-based bulk-fill and universal resin composites after immersion in coffee using various polishing systems.
A total of 160 samples were prepared using four different composite groups, with 40 pieces for each combined group. Based on the finishing procedure, the samples were divided into four subgroups for each composite group. Three different polishing procedures were applied to the samples according to the manufacturer's instructions. The control group was not subjected to any treatment. Initial colour measurements were performed using a VITA Easyshade V spectrophotometer. After the initial measurements, the samples were immersed in a Nescafe coffee solution for seven days, followed by colour measurements. Data were analysed using the Kolmogorov-Smirnov test and two-way analysis of variance. Tukey's honest significant difference (HSD) test was used to determine differences between subgroups.
The results indicate that bulk-fill resins exhibit more discolouration than universal composites; however, this difference was not statistically significant. The resin group with the smallest discolouration was Ceram X, and the most effective polishing method was Twist polishing.
Final surface polishing significantly reduced the composites' discolouration. These findings support the selection of appropriate materials and polishing techniques to achieve aesthetic outcomes and colour stability in dental restorations.
由于美观和物理性能，树脂复合材料在现代牙科中得到广泛应用。然而，前牙修复体变色是一个常见的问题。了解影响树脂复合材料颜色稳定性的因素可以实现更持久的修复。本研究旨在评估和比较纳米复合基块状填充和通用树脂复合材料在使用不同抛光系统浸泡在咖啡后颜色的变化。
共制备了 160 个样本，使用了四种不同的复合材料组，每个组合组有 40 个样本。根据完成程序，将样本分为每组复合材料的四个亚组。根据制造商的说明，对样本进行了三种不同的抛光程序。对照组未进行任何处理。使用 VITA Easyshade V 分光光度计对初始颜色进行测量。初始测量后，将样本浸泡在雀巢咖啡溶液中七天，然后进行颜色测量。使用 Kolmogorov-Smirnov 检验和双向方差分析对数据进行分析。使用 Tukey 的诚实显著差异（HSD）检验确定亚组之间的差异。
结果表明，块状填充树脂比通用复合材料更容易变色，但这种差异没有统计学意义。变色最小的树脂组是 Ceram X，最有效的抛光方法是 Twist 抛光。
最终表面抛光显著降低了复合材料的变色。这些发现支持选择合适的材料和抛光技术，以实现美学效果和牙科修复体的颜色稳定性。
