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Proceedings Paper

Viability of imaging structures inside human dentin using dental transillumination
Author(s): C. L. Grandisoli; F. D. Alves-de-Souza; M. M. Costa; L. Castro; P. A. Ana; D. M. Zezell; E. C. Lins
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Paper Abstract

Dental Transillumination (DT) is a technique for imaging internal structures of teeth by detecting infrared radiation transmitted throughout the specimens. It was successfully used to detect caries even considering dental enamel and dentin scatter infrared radiation strongly. Literature reports enamel’s scattering coefficient is 10 to 30 times lower than dentin; this explain why DT is useful for imaging pathologies in dental enamel, but does not disable its using for imaging dental structures or pathologies inside the dentin. There was no conclusive data in the literature about the limitations of using DT to access biomedical information of dentin. The goal in this study was to present an application of DT to imaging internal structures of dentin. Slices of tooth were confectioned varying the thickness of groups from 0.5 mm up to 2,5 mm. For imaging a FPA InGaAs camera Xeva 1.7- 320 (900-1700 nm; Xenics, Inc., Belgium) and a 3W lamp-based broadband light source (Ocean Optics, Inc., USA) was used; bandpass optical filters at 1000±10 nm, 1100±10 nm, 1200±10 nm and 1300±50 nm spectral region were also applied to spectral selection. Images were captured for different camera exposure times and finally a computational processing was applied. The best results revealed the viability to imaging dent in tissue with thickness up to 2,5 mm without a filter (900-1700nm spectral range). After these results a pilot experiment of using DT to detect the pulp chamber of an incisive human tooth was made. New data showed the viability to imaging the pulp chamber of specimen.

Paper Details

Date Published: 18 February 2014
PDF: 7 pages
Proc. SPIE 8929, Lasers in Dentistry XX, 892905 (18 February 2014); doi: 10.1117/12.2040082
Show Author Affiliations
C. L. Grandisoli, Univ. Federal do ABC (Brazil)
F. D. Alves-de-Souza, Univ. Federal do ABC (Brazil)
M. M. Costa, BioPDI Industria de Equipamentos Medico-Hospitalares (Brazil)
L. Castro, Xenics, Inc. (Brazil)
P. A. Ana, Univ. Federal do ABC (Brazil)
D. M. Zezell, Instituto de Pesquisas Energéticas e Nucleares (Brazil)
E. C. Lins, Univ. Federal do ABC (Brazil)

Published in SPIE Proceedings Vol. 8929:
Lasers in Dentistry XX
Peter Rechmann; Daniel Fried, Editor(s)

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