Biomaterials Department, Faculty of Dentistry, Cairo University, Cairo, 11562, Egypt.
BMC Oral Health. 2022 Aug 1;22(1):321. doi: 10.1186/s12903-022-02351-7.
The long-term color stability and gloss retention of resin composites are among the crucial factors that affect the clinical longevity of esthetic restorations, especially in anterior teeth. This study evaluated the effect of artificial aging by immersion in different storage media and thermocycling on color and gloss of dental single-shade resin composite (Omnichroma) versus multi-shade one (Filtek Z350XT). One hundred resin-composite disc-shaped specimens were used, 50 from each group, Omnichroma and Filtek Z350XT. Ten specimens from each material acted as control group (incubated in saliva). For each material, 40 specimens were divided according to the artificial-aging protocol (immersion at 37 °C for 12 days or thermocycling for 10,000 cycles) and storage media (tea, red wine). Color and gloss were measured before and after artificial aging. Color difference (∆E) was compared with perceptibility threshold and acceptability threshold. Data were statistically analyzed; independent t test was used to compare results between two tested materials, while two-way ANOVA was used to compare results among the different immersion media within the same material. Artificial aging (immersion or thermocycling) in tea and red wine led to significant color changes and gloss reduction in both materials (P < 0.05), in contrast to control group. Red wine produced highest color differences. Both dental resin-composites; the single-shade (Omnichroma) and multi-shade (Filtek Z350XT) displayed unacceptable discoloration and gloss reduction after artificial-aging in tea and red-wine by immersion or thermocycling simulating one-year clinical-service.
树脂复合材料的长期颜色稳定性和光泽保持性是影响美学修复临床寿命的关键因素之一，尤其是在前牙。本研究评估了通过浸泡在不同储存介质和热循环中来人工老化对牙科单色调树脂复合材料（Omnichroma）与多色调树脂复合材料（Filtek Z350XT）颜色和光泽的影响。使用了 100 个树脂复合材料盘形试件，每组 50 个，分别为 Omnichroma 和 Filtek Z350XT。每组材料中的 10 个试件作为对照组（在唾液中孵育）。对于每种材料，根据人工老化方案（在 37°C 下浸泡 12 天或热循环 10,000 次）和储存介质（茶、红酒）将 40 个试件进行分组。在人工老化前后测量颜色和光泽。比较颜色差异（∆E）与可察觉阈值和可接受阈值。对数据进行了统计学分析；使用独立 t 检验比较两种测试材料之间的结果，而使用双向方差分析比较同一材料中不同浸泡介质之间的结果。茶和红酒中的人工老化（浸泡或热循环）导致两种材料的颜色发生显著变化和光泽降低（P<0.05），与对照组相比。红酒产生的颜色差异最大。两种牙科树脂复合材料，单色调（Omnichroma）和多色调（Filtek Z350XT）在茶和红酒中浸泡或热循环模拟一年临床服务后，都显示出不可接受的变色和光泽降低。
