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


Autoria(s): Nicolodelli, Gustavo; Zanirato Lizarelli, Rosane de Fatima; Bagnato, Vanderlei Salvador
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

27/09/2013

27/09/2013

2012

Resumo

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. (C) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.JBO.17.4.048001]

Fundacao de Amparo a Pesquisa do Estado de Rio Paulo (Fapesp)

Fundacao de Amparo a Pesquisa do Estado de Rio Paulo (Fapesp)

National Counsel of Technological and Scientific Development (CNPq)

National Counsel of Technological and Scientific Development (CNPq)

Identificador

JOURNAL OF BIOMEDICAL OPTICS, BELLINGHAM, v. 17, n. 4, pp. 3255-3263, APR, 2012

1083-3668

http://www.producao.usp.br/handle/BDPI/33814

10.1117/1.JBO.17.4.048001

http://dx.doi.org/10.1117/1.JBO.17.4.048001

Idioma(s)

eng

Publicador

SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS

BELLINGHAM

Relação

JOURNAL OF BIOMEDICAL OPTICS

Direitos

openAccess

Copyright SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS

Palavras-Chave #ABLATION #FEMTOSECOND LASERS #DENTIN #BONES #YAG LASER #ER-YAG #THRESHOLD #DENTIN #ENAMEL #BONE #TISSUES #BIOCHEMICAL RESEARCH METHODS #OPTICS #RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Tipo

article

original article

publishedVersion