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Proceedings Paper

Laser-induced breakdown spectroscopy of dental lesions: diagnostic and therapeutic monitoring tool
Author(s): Ekaterina Borisova; Tzonko Uzunov; Dimitar Penev; Tsanislava Genova; Latchezar Avramov
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Paper Abstract

The carious decay develops a tiny area of demineralization on the enamel, which could be detected by element analytic techniques such as laser-induced breakdown spectroscopy (LIBS). That demineralization can quickly turn into a large lesion inside the tooth, it is often discovered too late to prevent the kind of decay that leads to cavities. The same optical LIBS detection approach could be used for monitoring of the caries removal using laser ablation or drilling techniques. For LIBS measurements we applied LIBS 2500Plus (Ocean Optics Inc., Dunedin, USA) system, which consists of seven spectrometric channels, covering spectral region from 200 to 980 nm, which optical resolution 0,05 nm, the spectrometers are connected with sample fiber bundle for 7-channels spectral system to the chamber for solid and liquid samples, Q-switched Nd:YAG laser, at 1 064 nm, with energy per pulse - 40 mJ, which is applied to induce plasma in the samples. LIBS spectra were obtained after single shot of the laser in the region of pathology. Samples investigated by LIBS are extracted teeth from patients, with periodontal problems on different stage of carious lesions, and their LIBS spectra are compared with the LIBS signals obtained from normal enamel and dentine tissues to receive complete picture of the carious lesion development. The major line of our investigations is related to the development of a methodology for real-time optical feedback control during selective ablation of tooth tissues using LIBS. Tooth structures, with and without pathological changes, are compared and their LIBS element analysis is used to differentiate major changes, which occur during tooth carious process and growth.

Paper Details

Date Published: 5 January 2017
PDF: 6 pages
Proc. SPIE 10226, 19th International Conference and School on Quantum Electronics: Laser Physics and Applications, 1022616 (5 January 2017); doi: 10.1117/12.2261423
Show Author Affiliations
Ekaterina Borisova, Institute of Electronics (Bulgaria)
Tzonko Uzunov, Medical Univ. Sofia (Bulgaria)
Dimitar Penev, Sofia Univ. (Bulgaria)
Tsanislava Genova, Institute of Electronics (Bulgaria)
Latchezar Avramov, Institute of Electronics (Bulgaria)

Published in SPIE Proceedings Vol. 10226:
19th International Conference and School on Quantum Electronics: Laser Physics and Applications
Tanja Dreischuh; Sanka Gateva; Albena Daskalova; Alexandros Serafetinides, Editor(s)

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