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Physical and thermal properties of human teeth determined by photomechanical, photothermal images to rapidly diagnose
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Paper Abstract

This paper details the current techniques for the detection of caries using non-invasive techniques, A promising option is tooth trans-illumination which is based on an increase of light scattering or light absorption in the affected tissue region. In this study trans-illumination applied to detect microscopic caries lesions was investigated using premolar teeth containing affected caries lesions. One line coincides with a carious absorption line, while the other is used as a reference. By this referencing the system is auto-calibrated continuously. Normal and carious human teeth were applied for the determination of NIR absorption by using a micro-spectrophotometer. Relative NIR absorption value for normal tooth and for carious one distributed in different quantity relating to the tooth structure, whereas the value showed much higher in enamel than in dentine. This paper suggests a way to use a commercially available system, which has the capability to carious detection. It is based on photomechanical and photothermal monitoring of teeth response. This technique is based on irradiation of the teeth with a short pulse Nd:YAG laser (1064 μm, 12 ns) and monitoring the laser-induced local thermal effects. This is realized with thermal imagers that locate the heated teeth absorbing zones. The photothermal (PT) image represents a two-dimensional depth-integrated temperature distribution in the irradiated volume and correlates with the conventional optical absorption coefficients. In addition to a description as to how each of the modalities function, consideration is given to recent advances and changes in the relevant technologies, and a comparison of relative benefits and shortfalls of the systems.

Paper Details

Date Published: 20 February 2009
PDF: 11 pages
Proc. SPIE 7186, Optical Diagnostics and Sensing IX, 71860K (20 February 2009); doi: 10.1117/12.807989
Show Author Affiliations
Yasser H. Elsharkawy, Egyptian Armed Forces (Egypt)

Published in SPIE Proceedings Vol. 7186:
Optical Diagnostics and Sensing IX
Gerard L. Coté, Editor(s)

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