Al-Kadi Faten K, Abdulkareem Jwan F, Azhdar Bruska A
Department of Prosthodontics, College of Dentistry, University of Sulaimani, Sulaymaniyah 46001, Iraq.
Nanotechnology Research Laboratory, Department of Physics, College of Science, University of Sulaimani, Sulaymaniyah 46001, Iraq.
Nanomaterials (Basel). 2023 Aug 20;13(16):2379. doi: 10.3390/nano13162379.
This study explores the impact of the incorporation of a chitosan-TiO nanocomposite on the color stability of pigmented room-temperature vulcanization maxillofacial silicone under various accelerated aging conditions. Five hundred disk-shaped specimens were formed with type A-2186 silicone elastomer, and they were distributed into groups based on pigment types and nanoparticle treatments. The color difference (ΔE) was assessed using a colorimeter in the CIELAB color system before and after exposure to aging conditions, including UV-accelerated aging and outdoor weathering. ANOVA, Dennett's T3, and Tukey HSD tests revealed significant color alterations across all silicone types, with the most pronounced being in the red-colored 3% chitosan specimens and the least pronounced being in the 2% TiO specimens that underwent UV-accelerated aging. Outdoor weathering consistently increased the ΔE values across all categories. This study suggests that while nanoparticles may offer some resistance against accelerated aging, they fall short in adequately defending against UV radiation during outdoor weathering.
本研究探讨了壳聚糖 - 二氧化钛纳米复合材料的加入对不同加速老化条件下着色室温硫化颌面硅橡胶颜色稳定性的影响。用A - 2186型硅橡胶制成500个圆盘形试样，并根据颜料类型和纳米颗粒处理方式将它们分组。在暴露于包括紫外线加速老化和户外风化在内的老化条件前后，使用CIELAB颜色系统中的色差仪评估色差（ΔE）。方差分析、丹内特T3检验和图基HSD检验显示，所有硅橡胶类型均出现了显著的颜色变化，其中红色3%壳聚糖试样的变化最为明显，而经历紫外线加速老化的2%二氧化钛试样的变化最不明显。户外风化使所有类别的ΔE值持续增加。本研究表明，虽然纳米颗粒可能对加速老化有一定的抗性，但在户外风化过程中，它们在充分抵御紫外线辐射方面存在不足。
