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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:28 |
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Conference: Bucharest University Faculty of Physics 2010 Meeting
Section: Biophysics and Medical Physics;Electricity and Magnetism
Title:
Femtosecond Laser As New Tool In Dental Surgery
Authors:
Iulian Ionita(1), Marian Zamfirescu(2), Tudor Mitran(1)
Affiliation:
(1)University of Bucharest
(2)National Institute for Laser, Plasma and Radiation Physics
E-mail
iulian.ionita@g.unibuc.ro
Keywords:
teeth ablation, femtosecond laser
Abstract:
We report teeth ablation experiments at different fluence values using a set-up composed by one high energy femtolaser, optical and mechanical equipment for focusing and displacement of the beam on the sample surface. Using a lens to focus the beam we have obtained fluence range between 64 J/cm2 and 0.21 J/cm2. Created structures were as single round craters, rows and large square craters shapes. Irradiation was made in single-pulse, multi-pulse and quasi-continuous (2 kHz) mode. Characterization of ablated structures was made by 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. Dimensions of structures are of tens microns, dependent on beam fluence and material hardness. We have obtained dimensions of about 5-7 microns making focalization with microscope objective of 10x. We appreciate the potential of the method to about 1 micron. In this case will be more difficult to observe and work the ablated structures. We have found enamel ablation threshold under 3 J/cm2. The results are positive considering the advantages of the method: ablation precision and no collateral damage.
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