Detection of calculus by laser-induced breakdown spectroscopy (LIBS) using an ultra-short pulse laser system (USPL)

F. Schelle; O. Brede; S. Krueger; B. Oehme; C. Dehn; M. Frentzen; A. Braun

doi:10.1117/12.873789

1 March 2011 Detection of calculus by laser-induced breakdown spectroscopy (LIBS) using an ultra-short pulse laser system (USPL)

F. Schelle, O. Brede, S. Krueger, B. Oehme, C. Dehn, M. Frentzen, A. Braun

Author Affiliations +

Proceedings Volume 7884, Lasers in Dentistry XVII; 788406 (2011) https://doi.org/10.1117/12.873789
Event: SPIE BiOS, 2011, San Francisco, California, United States

Abstract

The aim of this study was to assess the detection of calculus by Laser Induced Breakdown Spectroscopy (LIBS). The study was performed with an Nd:YVO4 laser, emitting pulses with a duration of 8 ps at a wavelength of 1064 nm. A repetition rate of 500 kHz at an average power of 5 W was used. Employing a focusing lense, intensities of the order of 10¹¹ W/cm² were reached on the tooth surface. These high intensities led to the generation of a plasma. The light emitted by the plasma was collimated into a fibre and then analyzed by an echelle spectroscope in the wavelength region from 220 nm - 900 nm. A total number of 15 freshly extracted teeth was used for this study. For each tooth the spectra of calculus and cementum were assessed separately. Comprising all single measurements median values were calculated for the whole spectrum, leading to two specific spectra, one for calculus and one for cementum. For further statistical analysis 28 areas of interest were defined as wavelength regions, in which the signal strength differed regarding the material. In 7 areas the intensity of the calculus spectrum differed statistically significant from the intensity of the cementum spectrum (p < 0.05). Thus it can be concluded that Laser Induced Breakdown Spectroscopy is well suited as method for a reliable diagnostic of calculus. Further studies are necessary to verify that LIBS is a minimally invasive method allowing a safe application in laser-guided dentistry.

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F. Schelle, O. Brede, S. Krueger, B. Oehme, C. Dehn, M. Frentzen, and A. Braun "Detection of calculus by laser-induced breakdown spectroscopy (LIBS) using an ultra-short pulse laser system (USPL)", Proc. SPIE 7884, Lasers in Dentistry XVII, 788406 (1 March 2011); https://doi.org/10.1117/12.873789

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KEYWORDS

Laser dentistry

Calculus

Pulsed laser operation

Laser induced breakdown spectroscopy

Laser tissue interaction

Laser applications

Laser systems engineering

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