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Proceedings Paper

Particle characteristics of different materials after ultra-short pulsed laser (USPL) irradiation
Author(s): Joerg Meister; Florian Schelle; Philip Kowalczyk; Matthias Frentzen
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Paper Abstract

The exposition of nanoparticles caused by laser application in dental health care is an open discussion. Based on the fact that nanoparticles can penetrate through the mucosa, the knowledge about particle characteristics after irradiation with an USPL is of high importance. Therefore, the aim of this study was to investigate the particle characteristics, especially the size of the ablated debris after USPL irradiation. The irradiation was carried out with an USP Nd:YVO4 laser with a center wavelength of 1064 nm. Based on the pulse duration of 8 ps and a pulse repetition rate of 500 kHz the laser emits an average power of 9 W. The materials investigated were dental tissues and dental restorative materials (composite and amalgam), ceramic and different metals (gold and aluminium). The samples were irradiated with a power density in the order of 300 GW/cm2 at distances of 5, 10, 15, and 20 mm. The debris was collected on an object plate. SEM pictures were used for analysis of the ablation debris. Depending on the irradiated material, we observed different kinds of structures: vitreous, flocculent, and pellet-like. The mean particle sizes were 10 x 10 up to 30 x 30 μm2. In addition, a cluster of ablated matter (nanometer range) distributed over the whole irradiated area was found. With increasing distances the cluster structure reduced from multi-layer to mono-layer clusters. Particle sizes in the micrometer and nanometer range were found after irradiation with an USPL. The nanoparticles create a cluster structure which is influenced by increasing distances.

Paper Details

Date Published: 30 January 2012
PDF: 10 pages
Proc. SPIE 8208, Lasers in Dentistry XVIII, 82080B (30 January 2012); doi: 10.1117/12.910181
Show Author Affiliations
Joerg Meister, Bonn Univ. Dental Faculty (Germany)
Florian Schelle, Bonn Univ. Dental Faculty (Germany)
Philip Kowalczyk, Bonn Univ. Dental Faculty (Germany)
Matthias Frentzen, Bonn Univ. Dental Faculty (Germany)

Published in SPIE Proceedings Vol. 8208:
Lasers in Dentistry XVIII
Peter Rechmann; Daniel Fried, Editor(s)

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