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Proceedings Paper

Optical coherence tomography of dental structures
Author(s): Angela Baumgartner; Christoph K. Hitzenberger; Sabine Dichtl; Harald Sattmann; Andreas Moritz; Wolfgang Sperr; Adolf Friedrich Fercher
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Paper Abstract

In the past ten years Partial Coherence Interferometry (PCI) and Optical Coherence Tomography (OCT) have been successfully developed for high precision biometry and tomography of biological tissues. OCT employs the partial coherence properties of a superluminescent diode and the Doppler principle yielding resolution and precision figures of the order of a few microns. Presently, the main application fields of this technique are biometry and imaging of ocular structures in vivo, as well as its clinical use in dermatology and endoscopic applications. This well established length measuring and imaging technique has now been applied to dentistry. First in vitro OCT images of the cemento (dentine) enamel junction of extracted sound and decayed human teeth have been recorded. These images distinguish dentine and enamel structures that are important for assessing enamel thickness and diagnosing caries. Individual optical A-Scans show that the penetration depth into enamel is considerably larger than into dentine. First polarization sensitive OCT recordings show localized changes of the polarization state of the light backscattered by dental material. Two-dimensional maps of the magnitude of the interference intensity and of the total phase difference between two orthogonal polarization states as a function of depth can reveal important structural information.

Paper Details

Date Published: 22 April 1998
PDF: 7 pages
Proc. SPIE 3248, Lasers in Dentistry IV, (22 April 1998); doi: 10.1117/12.306017
Show Author Affiliations
Angela Baumgartner, Institute of Medical Physics/Univ. of Vienna (Austria)
Christoph K. Hitzenberger, Institute of Medical Physics/Univ. of Vienna (Austria)
Sabine Dichtl, Institute of Medical Phjysics/Univ. of Vienna (Austria)
Harald Sattmann, Institute of Medical Physics/Univ. of Vienna (Austria)
Andreas Moritz, General Hospita of Vienna (Austria)
Wolfgang Sperr, General Hospital of Vienna (Austria)
Adolf Friedrich Fercher, Institite of Medical Physics Univ. of Vienna (Austria)

Published in SPIE Proceedings Vol. 3248:
Lasers in Dentistry IV
John D. B. Featherstone; Peter Rechmann; Daniel Fried, Editor(s)

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