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Proc SPIE Int Soc Opt Eng. 2017 Jan 28;10044. pii: 100440M. doi: 10.1117/12.2256745. Epub 2017 Feb 14.

Optical changes of dentin in the near-IR as a function of mineral content.

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University of California, San Francisco, San Francisco, CA 94143-0758.


The optical properties of human dentin can change markedly due to aging, friction from opposing teeth, and acute trauma, resulting in the formation of transparent or sclerotic dentin with increased mineral density. The objective of this study was to determine the optical attenuation coefficient of human dentin tissues with different mineral densities in the near-infrared (NIR) spectral regions from 1300-2200 nm using NIR transillumination and optical coherence tomography (OCT). N=50 dentin samples of varying opacities were obtained by sectioning whole extracted teeth into ~ 150 μm transverse sections at the cemento-enamel junction or the apical root. Transillumination images were acquired with a NIR camera and attenuation measurements were acquired at various NIR wavelengths using a NIR sensitive photodiode. Samples were imaged with transverse microradiography (gold standard) in order to determine the mineral density of each sample.


dentin; light scattering; near-IR imaging

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