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Journal of Biomedical Optics

Influence of effective number of pulses on the morphological structure of teeth and bovine femur after femtosecond laser ablation
Author(s): Gustavo Nicolodelli; Rosane de Fátima Zanirato Lizarelli; Vanderley S. Bagnato
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Paper Abstract

Femtosecond lasers have been widely used in laser surgery as an instrument for contact-free tissue removal of hard dental, restorative materials, and osseous tissues, complementing conventional drilling or cutting tools. In order to obtain a laser system that provides an ablation efficiency comparable to mechanical instruments, the laser pulse rate must be maximal without causing thermal damage. The aim of this study was to compare the different morphological characteristics of the hard tissue after exposure to lasers operating in the femtosecond pulse regime. Two different kinds of samples were irradiated: dentin from human extracted teeth and bovine femur samples. Different procedures were applied, while paying special care to preserving the structures. The incubation factor S was calculated to be 0.788±0.004 for the bovine femur bone. These results indicate that the incubation effect is still substantial during the femtosecond laser ablation of hard tissues. The plasma-induced ablation has reduced side effects, i.e., we observe less thermal and mechanical damage when using a superficial femtosecond laser irradiation close to the threshold conditions. In the femtosecond regime, the morphology characteristics of the cavity were strongly influenced by the change of the effective number of pulses.

Paper Details

Date Published: 19 March 2012
PDF: 8 pages
J. Biomed. Opt. 17(4) 048001 doi: 10.1117/1.JBO.17.4.048001
Published in: Journal of Biomedical Optics Volume 17, Issue 4
Show Author Affiliations
Gustavo Nicolodelli, Univ. de São Paulo (Brazil)
Rosane de Fátima Zanirato Lizarelli, Univ. de São Paulo (Brazil)
Vanderley S. Bagnato, Univ. de São Paulo (Brazil)

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