Investigation of pathological changes of human teeth by the method of laser-induced autofluorescence spectroscopy

Tzonko T. Uzunov; Ekaterina G. Borisova; Alexander I. Gizbreht; Lachezar A. Avramov

doi:10.1117/12.519587

4 November 2003 Investigation of pathological changes of human teeth by the method of laser-induced autofluorescence spectroscopy

Tzonko T. Uzunov, Ekaterina G. Borisova, Alexander I. Gizbreht, Lachezar A. Avramov

Author Affiliations +

Proceedings Volume 5226, 12th International School on Quantum Electronics: Laser Physics and Applications; (2003) https://doi.org/10.1117/12.519587
Event: 12th International School on Quantum Electronics Laser Physics and Applications, 2002, Varna, Bulgaria

Abstract

The goal of our study was to investigate the natural intrinsic fluorescence in carious human teeth and different stages of demineralization and any correspondence of such autofluorescence to the aminerl and organic distribution within the lesions. Fluorescence spectra of teeth, illuminated with 337 nm nitrogen laser were recorded. There was observed a significant decrease of the intensity of the autofluorescence signal in the case of caries. The fluorescence of the initial carious lesions had a lower intensity and a "red" shift compared to the intact teeth. Spectra, obtained from the enamel consisted of one intensive peak on the 480 - 500 nm and one secondary peak on 430 - 450 nm. In the dentine this secondary component had intensity, compared to the value of the 490 nm peak intensity. In process of the demineralization of the teeth we observed "blue" shift of the fluorescence spectra, obtained from the lesion's area -- spectral forms of the tooth strive for those of dentine. Undoubtedly, these results are one useful tool for differentiation between demineralization and initial caries.

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Tzonko T. Uzunov, Ekaterina G. Borisova, Alexander I. Gizbreht, and Lachezar A. Avramov "Investigation of pathological changes of human teeth by the method of laser-induced autofluorescence spectroscopy", Proc. SPIE 5226, 12th International School on Quantum Electronics: Laser Physics and Applications, (4 November 2003); https://doi.org/10.1117/12.519587

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KEYWORDS

Teeth

Luminescence

Dental caries

Laser spectroscopy

Spectroscopy

Fluorescence spectroscopy

Laser induced fluorescence

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