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Proceedings Paper

Investigation of ultrashort-pulsed laser on dental hard tissue
Author(s): Takeyuki Uchizono; Kunio Awazu; Akihiro Igarashi; Junji Kato; Yoshito Hirai
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Paper Abstract

Ultrashort-pulsed laser (USPL) can ablate various materials with precious less thermal effect. In laser dentistry, to solve the problem that were the generation of crack and carbonized layer by irradiating with conventional laser such as Er:YAG and CO2 laser, USPL has been studied to ablate dental hard tissues by several researchers. We investigated the effectiveness of ablation on dental hard tissues by USPL. In this study, Ti:sapphire laser as USPL was used. The laser parameter had the pulse duration of 130 fsec, 800nm wavelength, 1KHz of repetition rate and the average power density of 90~360W/cm2. Bovine root dentin plates and crown enamel plates were irradiated with USPL at 1mm/sec using moving stage. The irradiated samples were analyzed by SEM, EDX, FTIR and roughness meter. In all irradiated samples, the cavity margin and wall were sharp and steep, extremely. In irradiated dentin samples, the surface showed the opened dentin tubules and no smear layer. The Ca/P ratio by EDX measurement and the optical spectrum by FTIR measurement had no change on comparison irradiated samples and non-irradiated samples. These results confirmed that USPL could ablate dental hard tissue, precisely and non-thermally. In addition, the ablation depths of samples were 10&mgr;m, 20&mgr;m, and 60&mgr;m at 90 W/cm2, 180 W/cm2, and 360 W/cm2, approximately. Therefore, ablation depth by USPL depends on the average power density. USPL has the possibility that can control the precision and non-thermal ablation with depth direction by adjusting the irradiated average power density.

Paper Details

Date Published: 8 March 2007
PDF: 6 pages
Proc. SPIE 6425, Lasers in Dentistry XIII, 64250L (8 March 2007); doi: 10.1117/12.699739
Show Author Affiliations
Takeyuki Uchizono, Osaka Univ. (Japan)
Kunio Awazu, Osaka Univ. (Japan)
Akihiro Igarashi, Tokyo Dental College (Japan)
Junji Kato, Tokyo Dental College (Japan)
Yoshito Hirai, Tokyo Dental College (Japan)

Published in SPIE Proceedings Vol. 6425:
Lasers in Dentistry XIII
Peter Rechmann; Daniel Fried, Editor(s)

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