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Proceedings Paper

Laser-induced autofluorescence of caries
Author(s): Karsten Koenig; Raimund Hibst; Gabriela Flemming; Herbert Schneckenburger
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Paper Abstract

The laser induced autofluorescence from carious regions of human teeth was studied using a krypton ion laser at 407 nm as an excitation source, a fiberoptical detection system combined with a polychromator and an optical multichannel analyzer. In addition, time-resolved and time-gated fluorescence measurements in the nanosecond range were carried out. It was found that carious regions contain different fluorophores which emit in the red spectral range. The emission spectra with maxima around 590 nm, 625 nm and 635 nm are typical for metalloporphyrins, copro- and protoporphyrin. During excitation the fluorescence was bleached. Non-carious regions showed a broad fluorescence band with a maximum in the short-wavelength spectral region with shorter fluorescence decay times than the carious regions. Therefore, caries can be detected by spectral analysis of the autofluorescence as well as by determination of the fluorescence decay times or by time-gated imaging.

Paper Details

Date Published: 21 July 1993
PDF: 7 pages
Proc. SPIE 1880, Lasers in Orthopedic, Dental, and Veterinary Medicine II, (21 July 1993); doi: 10.1117/12.148317
Show Author Affiliations
Karsten Koenig, Institute for Lasertechnology in Medicine/Univ. of Ulm (Germany)
Raimund Hibst, Institute for Lasertechnology in Medicine/Univ. of Ulm (Germany)
Gabriela Flemming, Institute for Lasertechnology in Medicine/Univ. of Ulm (Germany)
Herbert Schneckenburger, Institute for Lasertechnology in Medicine/Univ. of Ulm (Germany)


Published in SPIE Proceedings Vol. 1880:
Lasers in Orthopedic, Dental, and Veterinary Medicine II
Dov Gal; Stephen J. O'Brien; C. T. Vangsness; Joel M. White; Harvey A. Wigdor, Editor(s)

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