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Proceedings Paper

Comparison between experimental and computational methods for scattering anisotropy coefficient determination in dental-resin composites
Author(s): Alicia Fernández-Oliveras; Irene M. Carrasco; Razvan Ghinea; María M. Pérez; Manuel Rubiño
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Paper Abstract

Understanding the behaviour of light propagation in biological materials is essential for biomedical engineering and its applications. Among the key optical properties of biological media is the angular distribution of the scattered light, characterized by the average cosine of the scattering angle, called the scattering anisotropy coefficient (g). The value of g can be determined by experimentally irradiating the material with a laser beam and making angular-scattering measurements in a goniometer. In this work, an experimental technique was used to determine g by means of goniometric measurements of the laser light scattered off two different dental-resin composites (classified as nano and hybrid). To assess the accuracy of the experimental method, a Mie theory-based computational model was used. Independent measurements were used to determine some of the required input parameters for computation of the theoretical model. The g values estimated with the computational method (nano-filled: 0.9399; hybrid: 0.8975) and the values calculated with the experimental method presented (nano-filled: 0.98297 ± 0.00021; hybrid: 0.95429 ± 0.00014) agreed well for both dental resins, with slightly higher experimental values. The higher experimental values may indicate that the scattering particle causes more narrow-angle scattering than does a perfect sphere of equal volume, assuming that with more spherical scattering particles the scattering anisotropy coefficient increases. Since g represents the angular distribution of the scattered light, values provided by both the experimental and the computational methods show a strongly forward-directed scattering in the dental resins studied, more pronounced in the nano-filled composite than in the hybrid composite.

Paper Details

Date Published: 8 May 2012
PDF: 7 pages
Proc. SPIE 8427, Biophotonics: Photonic Solutions for Better Health Care III, 84272B (8 May 2012); doi: 10.1117/12.921227
Show Author Affiliations
Alicia Fernández-Oliveras, Univ. de Granada (Spain)
Irene M. Carrasco, Univ. de Granada (Spain)
Razvan Ghinea, Univ. de Granada (Spain)
María M. Pérez, Univ. de Granada (Spain)
Manuel Rubiño, Univ. de Granada (Spain)

Published in SPIE Proceedings Vol. 8427:
Biophotonics: Photonic Solutions for Better Health Care III
Jürgen Popp; Wolfgang Drexler; Valery V. Tuchin; Dennis L. Matthews, Editor(s)

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