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Journal of Biomedical Optics

Optical properties of dental restorative materials in the wavelength range 400 to 700 nm for the simulation of color perception
Author(s): Moritz Friebel; Kirsten Povel; Hans-Joachim Cappius; Jürgen Helfmann; Martina C. Meinke
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Paper Abstract

Aesthetic restorations require dental restorative materials to have optical properties very similar to those of the teeth. A method is developed to this end to determine the optical parameters absorption coefficient μa, scattering coefficient μs, anisotropy factor g, and effective scattering coefficient &mu′s; of dental restorative materials. The method includes sample preparation and measurements of transmittance and reflectance in an integrating sphere spectrometer followed by inverse Monte Carlo simulations. Using this method the intrinsic optical parameters are determined for shade B2 of the light-activated composites TPH® Spectrum®, Esthet-X®, and the Ormocer® Definite® in the wavelength range 400 to 700 nm. By using the determined parameters μa, μs, and g together with an appropriate phase function, the reflectance of samples with 1-mm layer thickness and shade B2 could be predicted with a very high degree of accuracy using a forward Monte Carlo simulation. The color perception was calculated from the simulated reflectance according to the CIELAB system. We initiate the compilation of a data pool of optical parameters that in the future will enable calculation models to be used as a basis for optimization of the optical approximation of the natural tooth, and the composition of new materials and their production process.

Paper Details

Date Published: 1 September 2009
PDF: 7 pages
J. Biomed. Opt. 14(5) 054029 doi: 10.1117/1.3250292
Published in: Journal of Biomedical Optics Volume 14, Issue 5
Show Author Affiliations
Moritz Friebel, Laser- und Medizin-Technologie GmbH, Berlin (Germany)
Kirsten Povel, Laser- und Medizin-Technologie GmbH, Berlin (Germany)
Hans-Joachim Cappius, Laser- und Medizin-Technologie GmbH, Berlin (Germany)
Jürgen Helfmann, Laser- und Medizin-Technologie GmbH, Berlin (Germany)
Martina C. Meinke, Charité Universitätsmedizin Berlin (Germany)

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