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Related Experiment Videos

Calculation of colour resulting from composite/compomer layering techniques.

Y-K Lee1, J M Powers

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

Journal of Oral Rehabilitation
|November 5, 2004
PubMed
Summary

The color of double-layer dental filling materials depends on the optical properties of each layer. Regression equations predict layered material color based on scattering, absorption, and color values of covering and underlying layers.

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Area of Science:

  • Dental Materials Science
  • Optical Properties of Materials
  • Colorimetry

Background:

  • Aesthetic dental restorations require precise color matching.
  • Understanding the optical behavior of layered materials is crucial for predicting final restoration color.
  • Current methods for predicting layered material color are limited.

Purpose of the Study:

  • To determine how optical properties of constituent layers influence the color of double-layer aesthetic filling materials.
  • To develop regression equations for predicting the color of layered materials.
  • To identify key optical parameters affecting the final color.

Main Methods:

  • Prepared double-layered specimens using light-cured resin composites and a compomer.
  • Measured Commission Internationale de I'Eclairage (CIE) L*, a*, b* values using a spectrophotometer.

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  • Calculated scattering coefficient (S), absorption coefficient (K), contrast ratio (C), and translucency parameter (T).
  • Utilized forward regression analysis to correlate optical values of individual layers with the layered material's color.

    • Main Results:

    • CIE L* of layered material correlated positively with the scattering coefficient (S) of the covering layer.
    • CIE a* and b* of layered material showed strong correlations with the respective a* and b* values of the covering layer.
    • The regression equations derived could predict the layered color of these materials within study limitations.

    Conclusions:

    • The optical properties of the covering layer significantly influence the final color of double-layer aesthetic filling materials.
    • Scattering coefficient (S) of the covering layer is a key factor for predicting lightness (L*).
    • Color parameters (a*, b*) of the covering layer are primary determinants for the final a* and b* values.