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Proceedings Paper

Bovine dentin ablation using an MIR-FEL at the wavelength of 6.05 μm
Author(s): Manabu Heya; Kazushi Yoshikawa; Junji Kato
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Paper Abstract

Background and Objective: 6.05-μm-laser is strongly absorbed by means of both the OH bending of water and the amide-I of proteins. In order to prove the usefulness of dentin ablation by laser irradiation with λ = 6.05 μm, we investigated an ablative behavior of bovine dentin without a water spray. Study Design/Materials and Methods: The dehydrated bovine dentin was irradiated without a water spray by the mid-infrared Free Electron Laser at λ = 6.05 μm and λ = 9.7 μm, while varying the laser parameters, such as the incident fluence and the number of pulse. We observed the configurational changes in the irradiated dentin surface using a scanning electron microscope and estimated the removed volume using a laser confocal microscope. Also, we measured the temperature rise using a radiation thermometer and the emission spectrum using a fiber optics spectrometer during laser irradiation. Results: We found the followings: (1) the dentin was ablated by the evaporation of proteins at the maximum temperature rise of ~400 degC; (2) the irradiated dentin surface had dentinal tubules and was not melted; (3) the extent of the ablative behavior was proportional to the laser parameters used; (4) the tensile bonding strength between the irradiated dentin surface and the composite resin was significantly higher than that for Er:YAG laser irradiation. Conclusion: We can conclude that 6.05-μm-laser can thermo-mechanically excise dentin by the evaporation of proteins even without a water spray. We showed the applicability of a 6.05-μm-laser to a non-invasive laser treatment.

Paper Details

Date Published: 22 February 2008
PDF: 6 pages
Proc. SPIE 6843, Lasers in Dentistry XIV, 684302 (22 February 2008); doi: 10.1117/12.762547
Show Author Affiliations
Manabu Heya, Graduate School for Creation of New Photonics Industries (Japan)
Kazushi Yoshikawa, Osaka Dental Univ. (Japan)
Junji Kato, Tokyo Dental College (Japan)

Published in SPIE Proceedings Vol. 6843:
Lasers in Dentistry XIV
Peter Rechmann; Daniel Fried, Editor(s)

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