Postgraduate Researcher, Graduate School of Color Science and Technology, School of Design, University of Leeds, Leeds, England, UK.
Professor, Color Science and Technology, Graduate School of Color Science and Technology, School of Design, University of Leeds, Leeds, England, UK.
J Prosthet Dent. 2024 Nov;132(5):1020-1027. doi: 10.1016/j.prosdent.2023.07.035. Epub 2023 Sep 10.
Little is known about the effect of illuminant metamerism between natural teeth and zirconia restorations, despite their increasing clinical popularity.
The purpose of this in vitro study was to compare illuminant metamerism between pairs of natural teeth and layered zirconia restorations and pairs of natural teeth and monolithic zirconia restorations under 10 different illuminants and analyze their metameric potential.
Spectral reflectance factors were obtained from 10 pairs of extracted natural teeth and layered zirconia restorations and 28 pairs of extracted natural teeth and monolithic multilayer zirconia restorations. Each pair showed a color match that was within the visual threshold for clinical acceptability (CIEDE2000≤1.8). A special index of metamerism for the change of illuminant (M) was calculated from the CIEDE2000 color difference equation. Descriptive statistics and the one-sample t test were used to analyze the results for the M and for both groups of layered and monolithic zirconia restorations (α=.05).
Layered zirconia restorations reached a mean ±standard deviation value for M=0.3 ±0.2 and M=0.5 ±0.4 for monolithic zirconia restorations (P<.01).
The effect of illuminant metamerism between natural teeth and zirconia crowns was weak and generally within the clinical acceptability limit.
尽管氧化锆修复体在临床上越来越受欢迎，但人们对天然牙与氧化锆修复体之间的光源变色的影响知之甚少。
本体外研究的目的是比较 10 种不同光源下天然牙与分层氧化锆修复体以及天然牙与整体氧化锆修复体之间的光源变色，并分析其变色潜力。
从 10 对天然牙和分层氧化锆修复体以及 28 对天然牙和整体多层氧化锆修复体中获得光谱反射率因子。每对均显示出临床可接受性（CIEDE2000≤1.8）范围内的颜色匹配。从 CIEDE2000 色差方程中计算出光源变化的特殊变色指数（M）。使用描述性统计和单样本 t 检验分析 M 和分层氧化锆以及整体氧化锆修复体两组的结果（α=.05）。
分层氧化锆修复体的 M 值平均值±标准差为 0.3±0.2，整体氧化锆修复体的 M 值平均值±标准差为 0.5±0.4（P<.01）。
天然牙与氧化锆牙冠之间的光源变色影响较弱，通常在临床可接受范围内。
