Research Papers: Therapeutic

Influence of effective number of pulses on the morphological structure of teeth and bovine femur after femtosecond laser ablation

[+] Author Affiliations
Gustavo Nicolodelli, Rosane de Fátima Zanirato Lizarelli, Vanderlei Salvador Bagnato

University of São Paulo, Physics Institute of São Carlos, São Carlos, Instituto de Física de São Carlos, USP/Grupo de Óptica, Av. Trabalhador Sancarlense, 400; Caixa Postal: 369 São Carlos, CEP: 13560-970, SP, Brazil

J. Biomed. Opt. 17(4), 048001 (Mar 19, 2012). doi:10.1117/1.JBO.17.4.048001
History: Received August 3, 2011; Revised January 18, 2012; Accepted January 30, 2012
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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.

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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Gustavo Nicolodelli ; Rosane de Fátima Zanirato Lizarelli and Vanderlei Salvador Bagnato
"Influence of effective number of pulses on the morphological structure of teeth and bovine femur after femtosecond laser ablation", J. Biomed. Opt. 17(4), 048001 (Mar 19, 2012). ; http://dx.doi.org/10.1117/1.JBO.17.4.048001


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