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Proceedings Paper

Measurements of optical polarization properties in dental tissues and biomaterials
Author(s): Alicia Fernández-Oliveras; Oscar E. Pecho; Manuel Rubiño; María M. Pérez
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Paper Abstract

Since biological tissues can have the intrinsic property of altering the polarization of incident light, optical polarization studies are important for a complete characterization. We have measured the polarized light scattered off of different dental tissues and biomaterials for a comparative study of their optical polarization property. The experimental setup was composed by a He-Ne laser, two linear polarizers and a detection system based on a photodiode. The laser beam was passed through one linear polarizer placed in front of the sample, beyond which the second linear polarizer (analyzer) and the photodiode detector were placed. First, the maximum laser-light intensity (reference condition) was attained without the sample in the laser path. Then, the sample was placed between the two polarizers and the polarization shift of the scattered laser light was determined by rotating the analyzer until the reference condition was reached. Two dental-resin composites (nanocomposite and hybrid) and two human dental tissues (enamel and dentine) were analyzed under repeatability conditions at three different locations on the sample: 20 measurements of the shift were taken and the average value and the uncertainty associated were calculated. For the human dentine the average value of the polarization shift found was 7 degrees, with an associated uncertainty of 2 degrees. For the human enamel and both dental-resin composites the average shift values were found to be similar to their corresponding uncertainties (2 degrees). The results suggest that although human dentine has notable polarization properties, dental-resin composites and human enamel do not show significant polarization shifts.

Paper Details

Date Published: 26 July 2011
PDF: 7 pages
Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80012Y (26 July 2011); doi: 10.1117/12.892020
Show Author Affiliations
Alicia Fernández-Oliveras, Univ. de Granada (Spain)
Oscar E. Pecho, Univ. de Granada (Spain)
Manuel Rubiño, Univ. de Granada (Spain)
María M. Pérez, Univ. de Granada (Spain)

Published in SPIE Proceedings Vol. 8001:
International Conference on Applications of Optics and Photonics
Manuel Filipe Costa, Editor(s)

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