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Related Experiment Videos

Metameric effect between resin composite and dentin.

Yong-Keun Lee1, John M Powers

  • 1Department of Dental Biomaterials Science, Dental Research Institute, College of Dentistry, Seoul National University, Seoul, South Korea. ykleedm@snu.ac.kr

Dental Materials : Official Publication of the Academy of Dental Materials
|August 9, 2005
PubMed
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Metamerism in resin composites means their color appearance changes under different lighting conditions compared to natural dentin. This difference is crucial for accurate shade matching in dental restorations.

Area of Science:

  • Dental Materials Science
  • Color Science
  • Optical Properties

Background:

  • Metamerism, where objects exhibit different colors under varying light sources, is a critical factor in dental shade matching.
  • Understanding the metameric behavior of dental restorative materials like resin composites is essential for achieving aesthetically pleasing outcomes.

Purpose of the Study:

  • To quantify the metameric color differences between various shades of resin composites and human dentin.
  • To evaluate how these color differences vary under standard illuminants D65, A, and F2.

Main Methods:

  • Spectral reflectance and CIELAB color parameters of five resin composite shades were measured.
  • Optical properties of human dentin were used as a reference.
  • Color differences (deltaE(ab)*) and hue angle changes were calculated under illuminants D65, A, and F2.

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Main Results:

  • Three out of five resin composite shades exhibited metameric effects when compared to dentin.
  • Color differences (deltaE(ab)*) between resin composites and dentin varied significantly with changes in illuminant (ratios ranged from 0.74-0.98).
  • Color differences were generally larger under daylight (D65) compared to incandescent (A) or fluorescent (F2) light.

Conclusions:

  • Resin composites demonstrate different optical property changes under varying illuminants compared to dentin.
  • This metameric inconsistency necessitates careful consideration during the shade matching process for resin composites to ensure accurate color reproduction in clinical applications.