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Proceedings Paper

Diagnostic of human teeth using photoacoustic response
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Paper Abstract

Laser-induced photoacoustic spectroscopy (LIPS) can be used to measure trace-element concentration in materials, down to parts-per-million. In this paper we investigate the use of laser-induced photoacoustic response in carious teeth detection. First, we found the Q-switched Nd:YAG laser of a wavelength of 1064 nm to produce detectable response in teeth. Then, we implemented two detection techniques using a piezoelectric transducer and Michelson Interferometer. The accurately detected response of a tooth sample by the piezoelectric transducer was analyzed using spectral analysis. However, in dentistry we do not necessarily mead an exact quantitative measurement; thus we designed a more physically realizable system that measures the acoustically-induced surface displacement using Michelson Interferometer. Monitoring this surface displacement we were able to determine the physical and optical properties of the tooth sample which could be used as a basis in diagnostics. The responses obtained by both detectors were equally confined to the categorization of a carious tooth from a normal one.

Paper Details

Date Published: 15 February 2006
PDF: 9 pages
Proc. SPIE 6137, Lasers in Dentistry XII, 613701 (15 February 2006); doi: 10.1117/12.634879
Show Author Affiliations
Yasser H. El-Sharkawy, Egyptian Armed Forces (Egypt)
Y. Badr, Cairo Univ. (Egypt)
M. Gadallah, Egyptian Armed Forces (Egypt)
Ashraf F. El-Sherif, Egyptian Armed Forces (Egypt)

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

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