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Proceedings Paper

Effect of water spray during laser ablation on dental hard tissue
Author(s): Hyun Wook Kang; Ioana Rizoiu; A. J. Welch
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Paper Abstract

In this study, we investigated the role of water spray. To ablate human enamel tissue, a long-pulsed Er,Cr:YSGG laser was used at various radiant exposures. During dental ablation, distilled water was sprayed to the sample surface. Desiccated samples were also tested with direct irradiation for comparison. In order to identify dominant ablation mechanisms, transient acoustic waves were measured using a piezoelectric microphone. Enamel ablation efficiency was evaluated with Optical Coherence Tomography (OCT). Material removal was up to four times larger at the best flow rate with respect to ablation without spray. In spite of 60 % higher damage threshold by water absorption, spray ablation enhanced both the laser-induced acoustic transients up to six times and the ablation efficiency up to twice over the entire range of radiant exposures tested, compared to dry ablation. The improved pressure and ablation performance of the spray-assisted process with cooling effect were thought to be induced by recoil stress, rapid water vaporization, interstitial water explosion, and/or liquid-jet formation. Spray ablation along with water cooling and abrasive mechanical effects can be a safe and efficient modality for dental treatment.

Paper Details

Date Published: 8 March 2007
PDF: 13 pages
Proc. SPIE 6425, Lasers in Dentistry XIII, 64250M (8 March 2007); doi: 10.1117/12.702034
Show Author Affiliations
Hyun Wook Kang, American Medical Systems (United States)
The Univ. of Texas at Austin (United States)
Ioana Rizoiu, BioLase Technology (United States)
A. J. Welch, The Univ. of Texas at Austin (United States)

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

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