Department of Operative Dentistry, Endodontics, and Dental Materials, Bauru School of Dentistry, University of Sao Paulo (USP), Bauru, Brazil.
Department of Dental Materials and Prosthodontics, Sao Paulo State University (UNESP), Araçatuba Dental School, Brazil.
J Esthet Restor Dent. 2020 Sep;32(6):575-580. doi: 10.1111/jerd.12579. Epub 2020 Mar 14.
This study aimed to evaluate the color stability (ΔE ) of bis-acryl resins after different immersion solutions and storage time by different evaluation methods.
Sixty specimens (n = 30) were prepared from Protemp 4 and Structur 3. The specimens were divided into three groups (n = 10), according to the immersion solution (artificial saliva, cola beverage, and yerba mate tea) and evaluated at two storage times (7 and 14 days). The ΔE of each group was calculated using color coordinates obtained by a spectrophotometer and by a digital method, using the CIEDE2000 color difference formula. Data were analyzed by three-way ANOVA and Tukey test (α = 0.05).
The 7-day period presented the lowest ΔE values, regardless of the material and solution evaluated for both evaluation methods (ΔE < 0.93; ΔE < 3.12). The immersion solution with the highest color change was yerba mate tea after 14 days (ΔE > 2.11). For digital analyses, all materials and solutions at both times presented ΔE values higher than the clinically acceptable (ΔE > 1.8), while in spectrophotometer only in yerba mate tea (14 days) Structur was above the clinical acceptability level.
Yerba mate tea was the immersion solution with a higher color change in both materials and assessment methods. The highest values were found after 14 days of immersion, regardless of the solution. The ΔE for the digital method was higher than the spectrophotometer analysis.
It is important to identify the influence of staining beverages on interim materials used in patients requiring temporary rehabilitation. The use of a spectrophotometer seems to be more accurate than the digital method for the evaluation of color parameters of the tested materials.
本研究旨在通过不同的评估方法，评估不同浸泡溶液和储存时间对双丙烯酸树脂的颜色稳定性（ΔE）的影响。
从 Protemp 4 和 Structur 3 中制备了 60 个样本（n = 30）。根据浸泡溶液（人工唾液、可乐饮料和马黛茶）将样本分为三组（n = 10），并在两个储存时间（7 天和 14 天）进行评估。使用分光光度计和数字方法（CIEDE2000 色差公式），通过色坐标计算每组的ΔE。采用三因素方差分析和 Tukey 检验（α = 0.05）进行数据分析。
无论使用哪种评估方法，7 天内材料和溶液的ΔE 值均最低（ΔE ＜0.93；ΔE ＜3.12）。14 天后，浸泡溶液中颜色变化最大的是马黛茶（ΔE ＞2.11）。对于数字分析，所有材料和溶液在两个时间点的ΔE 值均高于临床可接受值（ΔE ＞1.8），而在分光光度计中，只有马黛茶（14 天）时 Structur 的结果高于临床可接受水平。
马黛茶是两种材料和评估方法中颜色变化最大的浸泡溶液。浸泡 14 天后，无论溶液如何，均会出现最高值。数字方法的ΔE 值高于分光光度计分析。
了解染色饮料对需要临时修复的患者所用临时修复材料的影响非常重要。与数字方法相比，分光光度计似乎更能准确评估所测试材料的颜色参数。
