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Proceedings Paper

Teeth material ablation by femtosecond laser
Author(s): Iulian Ionita; Marian Zamfirescu
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Paper Abstract

In this work we made teeth ablation experiments using a laser microprocessing set-up coupled with an amplified femtosecond laser system with 200 fs pulse duration. The experiments were performed at different laser fluences, from 0.21 J/cm2 up to 64 J/cm2. Structures with computer controlled geometries were created as single round craters, large square craters shapes, and parallel lines. Irradiation was made in single-pulse, multi-pulse, and quasi-continuous (2 kHz) mode at different laser scanning speeds. Characterization of ablated structures was made by optical microscopy and scanning electron microscopy. Ablation areas images show crystalline and regular structures. There are not evidences of material burning under 64 J/cm2. Generated structures are reproducible, dependent on dental quality. Enamel ablation threshold under 3 J/cm2 was measured. Dimensions of the ablated structures are of tens of micrometers, depending on beam fluence, focusing optics, and material hardness. When a 10x microscope objective was used, craters with about 5-7 micrometers were obtained. Better resolution of the structures can be obtained down to about 1 micron, however more difficult is to observe and work with such ablated structures. Femtosecond laser ablation demonstrates to be a promising method for teeth treatment due to its advantages: ablation precision and no collateral damages.

Paper Details

Date Published: 17 May 2010
PDF: 11 pages
Proc. SPIE 7715, Biophotonics: Photonic Solutions for Better Health Care II, 77151S (17 May 2010); doi: 10.1117/12.854274
Show Author Affiliations
Iulian Ionita, Univ. of Bucharest (Romania)
Marian Zamfirescu, National Institute for Laser, Plasma and Radiation (Romania)

Published in SPIE Proceedings Vol. 7715:
Biophotonics: Photonic Solutions for Better Health Care II
Jürgen Popp; Wolfgang Drexler; Valery V. Tuchin; Dennis L. Matthews, Editor(s)

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