University of Illinois Chicago, School of Dentistry, Chicago, IL 02115, United States.
J Dent. 2011 Dec;39 Suppl 3:e45-51. doi: 10.1016/j.jdent.2011.11.009. Epub 2011 Nov 15.
The aim of this study was to assess the accuracy of a prototype computer colour matching (CCM) system for dental ceramics targeting the colour of natural maxillary central incisors employing a dental spectrophotometer and the Kubelka-Munk theory.
Seventeen human volunteers with natural intact maxillary central incisors were selected to participate in this study. One central incisor from each subject was measured in the body region by a spectrophotometer and the reflectance values were used by the CCM system in order to generate a prescription for a ceramic mixture to reproduce the target tooth's colour. Ceramic discs were fabricated based on these prescriptions and layered on a zirconia ceramic core material of a specified colour. The colour match of each two-layered specimen to the target natural tooth was assessed by CIELAB colour coordinates (ΔE(), ΔL(), Δa() and Δb()).
The average colour difference ΔE() value was 2.58±84 for the ceramic specimen-natural tooth (CS-NT) pairs. ΔL() values ranged from 0.17 to 2.71, Δa() values ranged from -1.70 to 0.61, and Δb() values ranged from -1.48 to 3.81. There was a moderate inverse correlation (R=-0.44, p-value=0.0721) between L() values for natural target teeth and ΔE() values; no such correlation was found for a() and b() values.
The newly developed prototype CCM system has the potential to be used as an efficient tool in the reproduction of natural tooth colour.
本研究旨在评估一种针对上颌中切牙天然颜色的牙用陶瓷计算机配色（CCM）系统原型的准确性，该系统采用分光光度计和库贝尔卡-蒙克理论。
选择 17 名具有天然完整上颌中切牙的志愿者参与本研究。每个受试者的一颗中切牙在体部用分光光度计进行测量，将反射率值用于 CCM 系统，以生成复制目标牙齿颜色的陶瓷混合物处方。根据这些处方制作陶瓷片，并分层在特定颜色的氧化锆陶瓷芯材料上。用 CIELAB 颜色坐标（ΔE()、ΔL()、Δa() 和 Δb()）评估每个双层样本与目标天然牙齿的颜色匹配度。
陶瓷样本-天然牙齿（CS-NT）对的平均色差ΔE()值为 2.58±84。ΔL()值范围为 0.17 至 2.71，Δa()值范围为-1.70 至 0.61，Δb()值范围为-1.48 至 3.81。天然目标牙齿的 L()值与ΔE()值之间存在中度负相关（R=-0.44，p 值=0.0721）；而 a()和 b()值之间则没有这种相关性。
新开发的原型 CCM 系统有可能成为复制天然牙齿颜色的有效工具。
