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Proceedings Paper

Ex vivo imaging of early dental caries within the interproximal space
Author(s): Lin-P'ing Choo-Smith; Mark D. Hewko; Marc L. Dufour; Crystal Fulton; Pingli Qiu; Bruno Gauthier; Christian Padioleau; Charles-Etienne Bisaillon; Cecilia Dong; Blaine M. Cleghorn; Guy Lamouche; Michael G. Sowa
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Paper Abstract

Optical coherence tomography (OCT) is emerging as a technology that can potentially be used for the detection and monitoring of early dental enamel caries since it can provide high-resolution depth imaging of early lesions. To date, most caries detection optical technologies are well suited for examining caries at facial, lingual, incisal and occlusal surfaces. The approximal surfaces between adjacent teeth are difficult to examine due to lack of visual access and limited space for these new caries detection tools. Using a catheter-style probe developed at the NRC-Industrial Materials Institute, the probe was inserted into the interproximal space to examine the approximal surfaces with OCT imaging at 1310 nm. The probe was rotated continuously and translated axially to generate depth images in a spiral fashion. The probe was used in a mock tooth arch model consisting of extracted human teeth mounted with dental rope wax in their anatomically correct positions. With this ex vivo model, the probe provided images of the approximal surfaces revealing morphological structural details, regions of calculus, and especially regions of early dental caries (white spot lesions). Results were compared with those obtained from OCT imaging of individual samples where the approximal surfaces of extracted teeth are accessible on a lab-bench. Issues regarding access, regions of interest, and factors to be considered in an in vivo setting will be discussed. Future studies are aimed at using the probe in vivo with patient volunteers.

Paper Details

Date Published: 18 February 2009
PDF: 7 pages
Proc. SPIE 7162, Lasers in Dentistry XV, 716206 (18 February 2009); doi: 10.1117/12.809553
Show Author Affiliations
Lin-P'ing Choo-Smith, National Research Council Canada (Canada)
Mark D. Hewko, National Research Council Canada (Canada)
Marc L. Dufour, National Research Council Canada (Canada)
Crystal Fulton, National Research Council Canada (Canada)
Pingli Qiu, National Research Council Canada (Canada)
Bruno Gauthier, National Research Council Canada (Canada)
Christian Padioleau, National Research Council Canada (Canada)
Charles-Etienne Bisaillon, National Research Council Canada (Canada)
Cecilia Dong, Univ. of Manitoba (Canada)
Blaine M. Cleghorn, Dalhousie Univ. (Canada)
Guy Lamouche, National Research Council Canada (Canada)
Michael G. Sowa, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 7162:
Lasers in Dentistry XV
Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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