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Proceedings Paper

PS-OCT of occlusal and interproximal caries lesions viewed from occlusal surfaces
Author(s): Patara Ngaotheppitak; Cynthia L. Darling; Daniel Fried; Jeff Bush; Steve Bell
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Paper Abstract

Previous studies have demonstrated that Polarization Sensitive Optical Coherence Tomography (PS-OCT) can be used to image early dental caries. The primary objective of this study was to compare the measured reflectivity of natural occlusal caries lesions with the relative mineral loss measured using digital microradiography. There was excellent agreement between the increase in the integrated reflectivity in the perpendicular polarization axis of the PS-OCT system and the increase in the integrated mineral loss or lesion severity for occlusal lesions. Therefore, PS-OCT is ideally suited to image natural caries lesions in the important occlusal surfaces for the assessment of the lesion severity and activity. A secondary objective was to compare the performance of a new autocorrelator-based PS-OCT system employing a novel polarization-switching probe with our polarization-maintaining fiber based PS-OCT system, both operating at 1310-nm. The new PS-OCT system produced clean images with no artifacts and achieved high penetration depth. Yet a third objective was to determine if interproximal lesions can be imaged from the occlusal surface (from above) since interproximal lesions may only be accessible in vivo from buccal or lingual surfaces or from the occlusal surface. Simulated and natural interproximal caries lesions were imaged from the occlusal surfaces as long as there was no intervening dentin.

Paper Details

Date Published: 15 February 2006
PDF: 10 pages
Proc. SPIE 6137, Lasers in Dentistry XII, 61370L (15 February 2006); doi: 10.1117/12.661795
Show Author Affiliations
Patara Ngaotheppitak, Univ. of California, San Francisco (United States)
Cynthia L. Darling, Univ. of California, San Francisco (United States)
Daniel Fried, Univ. of California, San Francisco (United States)
Jeff Bush, Optiphase, Inc. (United States)
Steve Bell, Optiphase, Inc. (United States)

Published in SPIE Proceedings Vol. 6137:
Lasers in Dentistry XII
Peter Rechmann; Daniel Fried, Editor(s)

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