Particle characteristics of different materials after ultra-short pulsed laser (USPL) irradiation

Joerg Meister; Florian Schelle; Philip Kowalczyk; Matthias Frentzen

doi:10.1117/12.910181

30 January 2012 Particle characteristics of different materials after ultra-short pulsed laser (USPL) irradiation

Joerg Meister, Florian Schelle, Philip Kowalczyk, Matthias Frentzen

Proceedings Volume 8208, Lasers in Dentistry XVIII; 82080B (2012) https://doi.org/10.1117/12.910181
Event: SPIE BiOS, 2012, San Francisco, California, United States

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.

Citation Download Citation

Joerg Meister, Florian Schelle, Philip Kowalczyk, and Matthias Frentzen "Particle characteristics of different materials after ultra-short pulsed laser (USPL) irradiation", Proc. SPIE 8208, Lasers in Dentistry XVIII, 82080B (30 January 2012); https://doi.org/10.1117/12.910181

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