Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, China.
J Dent. 2010;38 Suppl 2:e100-5. doi: 10.1016/j.jdent.2010.05.009. Epub 2010 May 31.
This study evaluated the effects of nano-oxides on the color stability of pigmented silicone A-2186 maxillofacial prosthetic elastomers before and after artificial aging.
Each of three widely used UV-shielding nano-sized particle oxides (TiO(2), ZnO, CeO(2)), based on recent survey of the industry at 1%, 2%, 2.5% concentrations were combined with each of five intrinsic silicone pigment types (no pigments, red, yellow, blue, and a mixture of the three pigments). Silicone A-2186 without nano-oxides or pigments served as control, for a total of 46 experimental groups of elastomers. In each group of the study, all specimens were aged in an artificial aging chamber for an energy exposure of 450kJ/m(2). CIE Lab* values were measured by a spectrophotometer. The 50:50% perceptibility (ΔE*=1.1) and acceptability threshold (ΔE*=3.0) were used in interpretation of recorded color differences. Color differences after aging were subjected to three-way analysis of variance. Means were compared by Fisher's PLSD intervals at the 0.05 level of significance.
Yellow pigments mixed with all three nano-oxides at all intervals increased ΔE* values significantly from 3.7 up to 8.4. When mixed pigment groups were considered, TiO(2) at 2%, and 2.5% exhibited the smallest color changes, followed by ZnO and CeO(2), respectively (p<0.001). At 1%, CeO(2) exhibited the smallest color changes, followed by TiO(2) and ZnO, respectively (p<0.001). The smallest color differences, observed for nano-oxides groups, were recorded for CeO(2) at 1%, and TiO(2) at 2% and 2.5%. When the nano-oxides were tested at all concentrations, CeO(2) groups overall had the most color changes, and TiO(2) groups had the least. All ΔE* values of the mixed pigment groups were below the 50:50% acceptability threshold (ΔE*=1.2-2.3, below 3.0) except 2% CeO(2) (ΔE*=4.2).
1% nano-CeO(2) and 2% and 2.5% nano-TiO(2) used as opacifiers for silicone A-2186 maxillofacial prostheses with mixed pigments exhibited the least color changes when subjected to artificial aging at 450kJ/m(2). Yellow silicone pigment mixed with all three nano-oxides significantly affected color stability of A-2186 silicone elastomer.
本研究评估了纳米氧化物对经人工老化处理前后着色硅橡胶 A-2186 颌面赝复体弹性体颜色稳定性的影响。
基于最近对行业的调查，将三种广泛使用的紫外线屏蔽纳米级颗粒氧化物（TiO2、ZnO、CeO2）分别以 1%、2%、2.5%的浓度与五种固有硅酮颜料类型（无颜料、红色、黄色、蓝色和三种颜料的混合物）进行组合。不含纳米氧化物或颜料的硅橡胶 A-2186 作为对照，共有 46 组弹性体实验。在研究的每组中，所有标本均在人工老化室中进行能量暴露为 450kJ/m2的老化处理。使用分光光度计测量 CIE Lab值。使用 50:50%可察觉性（ΔE=1.1）和可接受性阈值（ΔE*=3.0）来解释记录的颜色差异。老化后的颜色差异进行三因素方差分析。在 0.05 水平的显著性上，通过 Fisher's PLSD 区间比较均值。
黄色颜料与所有三种纳米氧化物混合，在所有间隔时间内，ΔE值显著增加，从 3.7 增加到 8.4。当混合颜料组被考虑时，TiO2 以 2%和 2.5%显示出最小的颜色变化，其次是 ZnO 和 CeO2，分别为（p<0.001）。以 1%计，CeO2 显示出最小的颜色变化，其次是 TiO2 和 ZnO，分别为（p<0.001）。纳米氧化物组观察到的最小颜色差异，记录为 1%CeO2 和 2%和 2.5%TiO2。当纳米氧化物在所有浓度下进行测试时，CeO2 组的颜色变化最大，而 TiO2 组的颜色变化最小。混合颜料组的所有ΔE值均低于 50:50%可接受性阈值（ΔE*=1.2-2.3，低于 3.0），除 2%CeO2（ΔE*=4.2）外。
作为硅橡胶 A-2186 颌面赝复体的着色剂，1%纳米 CeO2 和 2%和 2.5%纳米 TiO2 在 450kJ/m2 人工老化下表现出最小的颜色变化。黄色硅酮颜料与三种纳米氧化物混合，显著影响 A-2186 硅酮弹性体的颜色稳定性。
Zotero 插件