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Proceedings Paper

Pulsed HF laser ablation of dentin
Author(s): Eirini I. Papagiakoumou; Dimitris N. Papadopoulos; Mersini I. Makropoulou; Maruan G. Khabbaz; Alexander A. Serafetinides
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Paper Abstract

The interaction of a TEA (Transversally Excited Atmospheric pressure) corona preionized oscillator double amplifier HF (hydrogen fluoride) laser beam with dentin tissue is reported. Pulses of 39 ns in the wavelength range of 2.65-3.35 μm and output energies in the range of 10-45 mJ, in a predominantly TEM00 beam were used to interact with dentin tissue. Ablation experiments were conducted with the laser beam directly focused on the tissue. Several samples of freshly extracted human teeth were used, cut longitudinally in facets of about 1mm thick and stored in phosphate buffered saline after being cleaned from the soft tissue remains. The experimental data (ablation thresholds, ablation rates) are discussed with respect to the ablation mechanism(s). Adequate tissue removal was observed and the ablation behavior was, in the greates part of the available fluences, almost linear. From the microscopic examination of teh samples, in a scanning electron microscope (SEM), the irradiated surfaces displayed oval craters (reflecting the laser beam shape) with absence of any melting or carbonization zone. It is suggested that the specific laser removes hard tissue by a combined photothermal and plasma mediated ablation mechanism, leaving a surface free from thermal damage and with a well-shaped crater.

Paper Details

Date Published: 23 March 2005
PDF: 4 pages
Proc. SPIE 5777, XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (23 March 2005); doi: 10.1117/12.611336
Show Author Affiliations
Eirini I. Papagiakoumou, National Technical Univ. of Athens (Greece)
Dimitris N. Papadopoulos, National Technical Univ. of Athens (Greece)
Mersini I. Makropoulou, National Technical Univ. of Athens (Greece)
Maruan G. Khabbaz, Univ. of Athens (Greece)
Alexander A. Serafetinides, National Technical Univ. of Athens (Greece)

Published in SPIE Proceedings Vol. 5777:
XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Jarmila Kodymova, Editor(s)

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