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Research Papers

Imaging caries lesions and lesion progression with polarization sensitive optical coherence tomography

[+] Author Affiliations
Daniel Fried, John Xie

University of California, San Francisco, Department of Preventive and Restorative Dental Science, San Francisco, California?94143

Sahar Shafi

California State University, Fresno, Fresno, California?93740

John D. B. Featherstone, Thomas M. Breunig, Charles Le

University of California, San Francisco, Department of Preventive and Restorative Dental Science, San Francisco, California?94143

J. Biomed. Opt. 7(4), 618-627 (Oct 01, 2002). doi:10.1117/1.1509752
History: Received Jan. 16, 2002; Revised Apr. 9, 2002; Accepted May 8, 2002; Online October 22, 2002
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New diagnostic tools are needed for the characterization of dental caries in the early stages of development. If carious lesions are detected early enough, they can be arrested without the need for surgical intervention. The objective of this study was to demonstrate that polarization sensitive optical coherence tomography (PS-OCT) can be used for the imaging of early caries lesions and for the monitoring of lesion progression over time. High-resolution polarization resolved images were acquired of natural caries lesions and simulated caries lesions of varying severity created over time periods of 1 to 14 days. Linearly polarized light was incident on the tooth samples and the reflected intensity in both orthogonal polarizations was measured. PS-OCT was invaluable for removing the confounding influence of surface reflections and native birefringence necessary for the enhanced resolution of the surface structure of caries lesions. This study demonstrated that PS-OCT is well suited for the imaging of interproximal and occlusal caries, early root caries, and for imaging decay under composite fillings. Longitudinal measurements of the reflected light intensity in the orthogonal polarization state from the area of simulated caries lesions linearly correlated with the square root of time of demineralization indicating that PS-OCT is well suited for monitoring changes in enamel mineralization over time. © 2002 Society of Photo-Optical Instrumentation Engineers.

© 2002 Society of Photo-Optical Instrumentation Engineers

Citation

Daniel Fried ; John Xie ; Sahar Shafi ; John D. B. Featherstone ; Thomas M. Breunig, et al.
"Imaging caries lesions and lesion progression with polarization sensitive optical coherence tomography", J. Biomed. Opt. 7(4), 618-627 (Oct 01, 2002). ; http://dx.doi.org/10.1117/1.1509752


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