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Journal of Biomedical Optics

Time-resolved microscopy reveals the driving mechanism of particle formation during ultrashort pulse laser ablation of dentin-like ivory
Author(s): Matthias Domke; Anna Gavrilova; Stephan Rapp; Matthias Frentzen; Joerg Meister; Heinz P. Huber
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Paper Abstract

In dental health care, the application of ultrashort laser pulses enables dental tissue ablation free from thermal side effects, such as melting and cracking. However, these laser types create undesired micro- and nanoparticles, which might cause a health risk for the patient or surgeon. The aim of this study was to investigate the driving mechanisms of micro- and nanoparticle formation during ultrashort pulse laser ablation of dental tissue. Time-resolved microscopy was chosen to observe the ablation dynamics of mammoth ivory after irradiation with 660 fs laser pulses. The results suggest that nanoparticles might arise in the excited region. The thermal expansion of the excited material induces high pressure in the surrounding bulk tissue, generating a pressure wave. The rarefaction wave behind this pressure wave causes spallation, leading to ejection of microparticles.

Paper Details

Date Published: 14 July 2015
PDF: 8 pages
J. Biomed. Opt. 20(7) 076005 doi: 10.1117/1.JBO.20.7.076005
Published in: Journal of Biomedical Optics Volume 20, Issue 7
Show Author Affiliations
Matthias Domke, FH Vorarlberg (Austria)
Anna Gavrilova, Laserzentrum der Hochschule für angewandte Wissenschaften München (Germany)
Stephan Rapp, Hochschule für Angewandte Wissenschaften München (Germany)
Friedrich-Alexander-Universität Erlangen-Nürnberg (Germany)
Matthias Frentzen, Rheinische Friedrich-Wilhelms-Univ. Bonn (Germany)
Joerg Meister, Rheinische Friedrich-Wilhelms-Univ. Bonn (Germany)
RWTH Aachen Univ. (Germany)
Heinz P. Huber, Laser Center of Munich Univ. of Applied Sciences (Germany)

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