Dr. Kirsten K. Weniger Profile

Dr. Kirsten K. Weniger

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Proceedings Article | 23 March 2005 Paper

Calculation of optical properties of dental composites as a basis for determining color impression and penetration depth of laser light

Kirsten Weniger, Gerhard Muller

Proceedings Volume 5687, (2005) https://doi.org/10.1117/12.585758

KEYWORDS: Scattering, Composites, Absorption, Monte Carlo methods, Light scattering, Optical properties, Reflectivity, Refractive index, Anisotropy, Particles

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In order to achieve esthetic dental restorations, there should be no visible difference between restorative material and treated teeth. This requires a match of the optical properties of both restorative material and natural teeth. These optical properties are determined by absorption and scattering of light emerging not only on the surface but also inside the material. Investigating different dental composites in several shades, a method has been developed to calculate the optical parameters absorption coefficient μa, scattering coefficient μs, anisotropy factor g and reduced scattering coefficient μs'. The method includes sample preparation and measurements of transmittance and reflectance in an integrating sphere spectrometer, followed by inverse Monte Carlo simulations. Determination of optical properties is more precise and comprehensive than with the previously used Kubelka Munk theory because scattering can be looked at separated into pure scattering with the scattering coefficient μs and its direction with the anisotropy factor g. Moreover the use of the inverse Monte Carlo simulation not only minimizes systematic errors and considers the scattering phase function, but also takes into account the measuring geometry. The compilation of a data pool of optical parameters now enables the application of further calculation models as a basis for optimization of the composition of new materials. For example, a prediction of the general color impression for multiple layers can be carried out as well as the calculation of the wavelength dependent penetration depths of light with regard to photo polymerization. Further applications are possible in the area of laser ablation.

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