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Proceedings Paper

Effects on soft tissue produced by a visible violet diode laser
Author(s): G. Akashi; J. Kato D.D.S.; H. Hatayama; A. Inoue; Y. Hirai D.D.S.
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Paper Abstract

A violet laser with an oscillating wavelength of 405 nm has recently been developed in industry. Laser irradiation at this wavelength penetrates tissue less aggressively than Nd:YAG and diode laser irradiation at wavelengths of 810 nm, and more aggressively than irradiation by carbon dioxide laser. Further, protein is reported to absorb this 405 nm wavelength at high rates. This study was conducted to evaluate the effect of the violet laser on soft tissue in vitro. A prototype violet diode laser produced by Sumitomo Electric Industries was used. This laser irradiates with a continuous wave at a wavelength of 405 nm. Soft tissue samples were irradiated by the device at output powers in a range from 850 mW to 2400 mW as the irradiated samples were conveyed at a scanning speed of 1 mm/sec. The beam diameter was about 270 μm. The irradiated samples were observed by a stereoscopic microscope, fixed with a 10% neutral formalin aqueous solution, and histologically examined. Irradiation by the device vaporized a U-shaped section of tissue to a depth of about 350 to 900 μm. A denatured layer measuring 300 to 450 μm in width was observed under the carbonization layer. The depth of vaporization increased in proportion to the power. These results indicate that a violet laser has good potential to become an effective laser for the cutting and coagulation of soft tissue.

Paper Details

Date Published: 15 February 2006
PDF: 8 pages
Proc. SPIE 6137, Lasers in Dentistry XII, 61370O (15 February 2006); doi: 10.1117/12.646425
Show Author Affiliations
G. Akashi, Tokyo Dental College (Japan)
J. Kato D.D.S., Tokyo Dental College (Japan)
H. Hatayama, Sumitomo Electric Industries, Ltd. (Japan)
A. Inoue, Sumitomo Electric Industries, Ltd. (Japan)
Y. Hirai D.D.S., Tokyo Dental College (Japan)

Published in SPIE Proceedings Vol. 6137:
Lasers in Dentistry XII
Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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