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Proceedings Paper

Minimally invasive treatment of carious dentin with a nanosecond pulsed laser at 5.8 um wavelength
Author(s): Katsunori Ishii; Masayuki Saiki; Kazushi Yoshikawa; Kenzo Yasuo; Kazuyo Yamamoto; Kunio Awazu
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Paper Abstract

Conventional lasers, Er:YAG laser and Er,Cr:YSGG laser, lack the ability for selective excavation to discriminate carious tissue only because they use the laser tissue interaction derived from a strong absorption of water. Based on the absorption property of carious dentin, characteristic absorption bands around 6 μm are candidate for selective excavation. Our group has already observed the difference of ablation depth between demineralized and normal dentin in the wavelength range from 5.75 to 6.60 μm. Also this study has showed the effectiveness of 5.8 μm. Objective of this study is to determine optimal irradiation parameters of selective excavation by using 5.8 μm. Bovine dentin plates demineralized by soaking in lactic acid solution were used as a carious dentin model. A nanosecond pulsed laser at 5.8 μm wavelength was obtained by difference-frequency generation technique. The laser delivers 5 ns pulse width at a repetition rate of 10 Hz. After irradiation, morphological change and measurement of ablation depth was observed with a scanning electron microscope and a confocal laser microscope, respectively. In 5.8 μm wavelength, high ablation efficiency with a low thermal side effect was observed. 5.8 μm wavelength provides a selective excavation technique for minimal intervention.

Paper Details

Date Published: 16 February 2012
PDF: 6 pages
Proc. SPIE 8208, Lasers in Dentistry XVIII, 82080K (16 February 2012); doi: 10.1117/12.907966
Show Author Affiliations
Katsunori Ishii, Osaka Univ. (Japan)
Masayuki Saiki, Osaka Univ. (Japan)
Kazushi Yoshikawa, Osaka Dental Univ. Hospital (Japan)
Kenzo Yasuo, Osaka Dental Univ. Hospital (Japan)
Kazuyo Yamamoto, Osaka Dental Univ. Hospital (Japan)
Kunio Awazu, Osaka Univ. (Japan)
Univ. of Fukui (Japan)

Published in SPIE Proceedings Vol. 8208:
Lasers in Dentistry XVIII
Peter Rechmann; Daniel Fried, Editor(s)

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