Assessment of a prototype computer color matching system to reproduce natural tooth color on ceramic restorations

作者：Kristiansen Joshua; Sakai Maiko; Da Silva John D; Gil Mindy; Ishikawa Nagai Shigemi^*

来源：Journal of Dentistry, 2011, 39: E45-E51.

DOI：10.1016/j.jdent.2011.11.009

• Computer color matching
• Kubelka-Munk theory
• Spectrophotometer
• Color matching
• All-ceramic crown

Objectives: The aim of this study was to assess the accuracy of a prototype computer color matching (CCM) system for dental ceramics targeting the color of natural maxillary central incisors employing a dental spectrophotometer and the Kubelka-Munk theory.
Methods: 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 color. Ceramic discs were fabricated based on these prescriptions and layered on a zirconia ceramic core material of a specified color. The color match of each two-layered specimen to the target natural tooth was assessed by CIELAB color coordinates (Delta E*, Delta L*, Delta a* and Delta b*).
Results: The average color difference DE* value was 2.58 +/- 84 for the ceramic specimennatural tooth (CS-NT) pairs. Delta L* values ranged from 0.17 to 2.71, Delta a* values ranged from -1.70 to 0.61, and Delta b* 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 Delta E* values; no such correlation was found for a* and b* values.
Conclusion: The newly developed prototype CCM system has the potential to be used as an efficient tool in the reproduction of natural tooth color.

• 出版日期2011-12