Diamantopoulou Sofia, Johnston William M, Ghinea Razvan, Papazoglou Efstratios
Department of Operative Dentistry, School of Health Sciences, Faculty of Dentistry, University of Athens, Athens, Greece.
Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Columbus, Ohio, USA.
J Esthet Restor Dent. 2023 Mar;35(2):352-359. doi: 10.1111/jerd.12913. Epub 2022 Apr 4.
Define the color of anterior teeth of a selected population and correlate it (by using coverage error [CE] and the frequency of best match) with the final color of all possible enamel-dentine combinations of three different resin composite systems.
Color of 636 vital unrestored anterior teeth (central incisors, lateral incisors and canines; n = 212) and disk specimens (12 mm diameter, varying thickness) corresponding to enamel-dentin combinations of all available enamel (0.5 mm and 1.0 mm thickness) and dentin shades (3.0 mm thickness) of Essentia, Enamel Plus HRi and IPS Empress Direct composite systems was measured using a clinical dental spectrophotometer (Spectroshade Micro). CE and frequency of best match for all composite systems were calculated for the measured in-vivo teeth color space.
Natural in-vivo teeth exhibit higher lightness when compared to enamel-dentin composite combinations, independently of the enamel thickness used. The best (lowest) CE was found for IPS Empress, while the highest values were found for Enamel Plus Hri independently of tooth type and enamel thickness (p < 0.001). The use of 0.5 mm instead of 1.0 mm enamel thickness within enamel-dentin composite combinations resulted in a lower CE for in-vivo tooth color (p < 0.001).
The color space defined by all possible enamel-dentin combinations of the studied resin composite systems does not fully match the color range of anterior teeth. All composite systems examined lack combinations with lightness values as high as the population's. IPS Empress Direct composite system represented better the in-vivo teeth color.
The use of 0.5 mm enamel shade thickness is suggested when building layered restorations, as it provided better color coverage than using 1.0 mm thickness.
确定特定人群上前牙的颜色，并通过覆盖误差（CE）和最佳匹配频率将其与三种不同树脂复合材料系统的所有可能釉质-牙本质组合的最终颜色相关联。
使用临床牙科分光光度计（Spectroshade Micro）测量636颗活髓未修复上前牙（中切牙、侧切牙和尖牙；n = 212）以及与Essentia、Enamel Plus HRi和IPS Empress Direct复合树脂系统所有可用釉质（0.5毫米和1.0毫米厚度）和牙本质色阶（3.0毫米厚度）的釉质-牙本质组合相对应的圆盘标本（直径12毫米，厚度各异）的颜色。针对测量的体内牙齿颜色空间，计算所有复合树脂系统的CE和最佳匹配频率。
与釉质-牙本质复合组合相比，天然活髓牙呈现出更高的明度，与所使用的釉质厚度无关。IPS Empress的CE最佳（最低），而Enamel Plus Hri的CE值最高，与牙齿类型和釉质厚度无关（p < 0.001）。在釉质-牙本质复合组合中使用0.5毫米而非1.0毫米的釉质厚度，可使体内牙齿颜色的CE降低（p < 0.001）。
所研究的树脂复合系统所有可能的釉质-牙本质组合所定义的颜色空间与上前牙的颜色范围不完全匹配。所有检查的复合树脂系统都缺乏明度值与该人群一样高的组合。IPS Empress Direct复合树脂系统能更好地呈现体内牙齿颜色。
在构建分层修复体时，建议使用0.5毫米的釉质色阶厚度，因为它比使用1.0毫米厚度能提供更好的颜色覆盖。
