Abstract This study evaluated the influence of silver nanoparticles (NAg) incorporated into the primer of a three-step adhesive system (Scotch-Bond Multi-purpose) over the composite-resin colour (CIELab and CIEDE 2000) as a function of the concentration and ageing methods. Ninety specimens were prepared and distributed into 6 groups (n = 15), according to the NAg concentration: NAg 0 (0 wt%); NAg 50 (0.005 wt%); NAg 100 (0.010 wt%); NAg 150 (0.015 wt%); NAg 200 (0.020 wt%); NAg 250 (0.025 wt%). Initial colour readings were performed to evaluate colour change (CC) after NAg addition to primers. Readings after 30 days of storage in water (30D), thermocycling (TC), and accelerated artificial ageing (AAA) were performed to verify the influence of each method over CC. Data was calculated according to CIELab and CIEDE 2000 systems and analysed with one-way and two-way ANOVA (p ≤ 0.05), complemented with post-hoc Tukey test. Data presented normality, homoscedasticity, and statistical difference. ΔEs gradually increased according to the percentage of added NAg into the primer. Thermocycling and UV light exposure induced a higher colour change when compared to water ageing (D30). Significant statistical difference was found for all ageing methods. CIEDE 2000 and CIELab are similar methods of colour evaluation. Besides, primers with up to 0.025 wt% applied in cavities deeper than 1 mm were colour-safe and did not jeopardise the aesthetic perception of the simulated restoration.

中文翻译：

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添加到商业粘合剂底漆中的银纳米粒子：随着老化的颜色变化和树脂颜色稳定性

摘要 本研究评估了掺入三步粘合剂系统 (Scotch-Bond Multi-purpose) 底漆中的银纳米粒子 (NAg) 对复合树脂颜色 (CIELab 和 CIEDE 2000) 的影响，作为浓度和老化方法。制备了 90 个样品，并根据 NAg 浓度分为 6 组（n = 15）：NAg 0 (0 wt%)；NAg 50 (0.005 wt%); NAg 100 (0.010 wt%); NAg 150 (0.015 wt%); NAg 200 (0.020 wt%); NAg 250 (0.025 wt%)。在将 NAg 添加到引物中后，进行初始颜色读数以评估颜色变化 (CC)。在水中储存 30 天 (30D)、热循环 (TC) 和加速人工老化 (AAA) 后进行读数，以验证每种方法对 CC 的影响。根据 CIELab 和 CIEDE 2000 系统计算数据，并使用单向和双向方差分析 (p ≤ 0.05) 进行分析，并辅以事后 Tukey 检验。数据呈现正态性、同方差性和统计差异。ΔEs 根据加入引物中 NAg 的百分比逐渐增加。与水老化 (D30) 相比，热循环和紫外线照射会引起更高的颜色变化。发现所有老化方法都有显着的统计差异。CIEDE 2000 和 CIELab 是类似的颜色评估方法。此外，在深度超过 1 mm 的空腔中使用高达 0.025 wt% 的底漆是颜色安全的，并且不会危及模拟修复体的美感。和统计差异。ΔEs 根据加入引物中 NAg 的百分比逐渐增加。与水老化 (D30) 相比，热循环和紫外线照射会引起更高的颜色变化。所有老化方法都发现了显着的统计差异。CIEDE 2000 和 CIELab 是类似的颜色评估方法。此外，在深度超过 1 毫米的空腔中使用高达 0.025 wt% 的底漆是颜色安全的，并且不会危及模拟修复体的美感。和统计差异。ΔEs 根据加入引物中 NAg 的百分比逐渐增加。与水老化 (D30) 相比，热循环和紫外线照射会引起更高的颜色变化。发现所有老化方法都有显着的统计差异。CIEDE 2000 和 CIELab 是类似的颜色评估方法。此外，在深度超过 1 mm 的空腔中使用高达 0.025 wt% 的底漆是颜色安全的，并且不会危及模拟修复体的美感。