Prosthodontics, Researcher, Samsun, Turkey.
University of Ondokuz Mayıs, Faculty of Dentistry, Department of Prosthodontics, Samsun, Turkey.
J Esthet Restor Dent. 2021 Jun;33(4):648-653. doi: 10.1111/jerd.12720. Epub 2021 Feb 10.
The purpose of this study was to investigate the effect of mouth rinses on the color and translucency of three computer-aided design and computer-aided manufacturing (CAD-CAM) restorative materials in laminate veneer and crown thicknesses.
Specimens from two different 5Y-TZP zirconia (InCoris TZI (IT), and Zirkonzahn (ZH)) and lithium disilicate (IPS e.max CAD [IC]) in two different thicknesses (0.7 mm for laminate veneer, and 1.5 mm for crown) were sectioned. All specimens were colored with an A2-shade liquid, and the baseline color values were recorded according to the CIELab system with a spectrophotometer. Each group was divided into two subgroups (n = 15) according to the immersion solution: two different mouth rinses, KL (Klorhex), and LI (Listerine, cool mint) for 180 hours. The color coordinates (L*, a*, b*) of the specimens were measured before and after immersion in a mouth rinse, and TP and ΔE color differences were calculated by using the CIEDE2000 color difference formula. A 3-way ANOVA, Bonferroni test, and 1-sample t tests were used to analyze the data (α = 0.05).
The 3-way ANOVA revealed a significant interaction of material, thickness, and mouth rinse for translucency parameter and color difference (ΔE ) data (p < 0.001). TP decreased for both zirconia materials in laminate veneer thickness when immersed in LI mouth rinse (p < 0.05). No difference was found among the TP mean values of three materials in crown thickness after immersed in mouth rinses (p > 0.826). Both zirconia materials immersed in LI showed greater discoloration than after immersed in KL (p < 0.05). A significant difference was found in color change values among three materials for the laminate veneer thickness after immersed in LI (p < 0.001). However, all color difference values were within the clinical acceptability threshold, except for when ZH in laminate veneer thickness was immersed in LI.
The color change of ZH zirconia with LI mouth rinse in laminate veneer thickness was high. For both zirconia ceramics, translucency decreased and the color was less stable in laminate veneer thickness after immersed in LI compared to the crown thickness.
The results of this in vitro study suggest that long-term use of alcohol-containing mouth rinse may alter the optical properties of tested CAD-CAM materials in tested laminate veneer thickness. For color stability with the long term use of tested mouth rinses, lithium disilicate may be preferred for both types of restorations.
本研究旨在探讨漱口对三种计算机辅助设计和计算机辅助制造（CAD-CAM）修复材料在贴面和牙冠厚度中的颜色和半透明度的影响。
从两种不同的 5Y-TZP 氧化锆（InCoris TZI（IT）和 Zirkonzahn（ZH））和锂硅二硅酸锂（IPS e.max CAD[IC]）中切取两种不同厚度（贴面厚度为 0.7mm，牙冠厚度为 1.5mm）的样本。所有样本均用 A2 色调液体着色，并使用分光光度计根据 CIELab 系统记录基础色值。根据浸泡溶液将每组分为两个亚组（n=15）：两种不同的漱口液，KL（洗必泰）和 LI（李施德林，清凉薄荷味），浸泡 180 小时。在浸泡于漱口液之前和之后测量样本的颜色坐标（L*、a*、b*），并使用 CIEDE2000 色差公式计算 TP 和ΔE 色差。使用 3 因素方差分析、Bonferroni 检验和 1 样本 t 检验分析数据（α=0.05）。
3 因素方差分析显示，半透明度参数和色差（ΔE）数据的材料、厚度和漱口液之间存在显著交互作用（p<0.001）。LI 漱口液浸泡时，两种氧化锆材料的贴面厚度的 TP 均降低（p<0.05）。LI 漱口液浸泡后，牙冠厚度三种材料的 TP 平均值之间无差异（p>0.826）。LI 漱口液浸泡后，两种氧化锆材料的变色程度均大于 KL（p<0.05）。LI 漱口液浸泡后，贴面厚度三种材料的颜色变化值之间存在显著差异（p<0.001）。然而，除了 ZH 氧化锆在贴面厚度时浸泡于 LI 之外，所有色差值均在临床可接受范围内。
LI 漱口液浸泡时，ZH 氧化锆的颜色变化较大。对于两种氧化锆陶瓷，与牙冠厚度相比，LI 漱口液浸泡后，贴面厚度的半透明度降低，颜色稳定性降低。
本体外研究结果表明，长期使用含酒精的漱口液可能会改变测试贴面厚度的 CAD-CAM 材料的光学性能。对于长期使用测试漱口液的颜色稳定性，两种修复类型可能更倾向于使用锂硅二硅酸锂。
