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Journal of Biomedical Optics

Structural modifications induced in dentin by femtosecond laser
Author(s): Quang-Tri Le; Caroline Bertrand; Rui Vilar
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Paper Abstract

The structural and chemical modifications induced in dentin by ultrafast laser ablation were studied. The laser experiments were performed with a Yb:KYW chirped-pulse-regenerative amplification laser system (560-fs pulse duration, 1030-nm radiation wavelength), fluences in the range 2 to 14    J / cm 2 , 1-kHz pulse repetition rate, and 5 - mm / s scanning speed. The ablation surfaces were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy. The ablation surfaces produced with 2    J / cm 2 presented an irregular morphology with exposed dentinal tubules and no evidence of thermal effects. For 7 and 14    J / cm 2 , the ablation surfaces were covered by a layer of redeposited ablation debris, consisting mainly of amorphous calcium phosphate. This layer is weakly adherent to the underlying tissue and can be easily removed by ultrasonication, revealing a surface with a morphology similar to the one obtained with 2    J / cm 2 . The constitution of the dentin ablation surfaces is similar to the constitution of pristine dentin, showing that, within this fluence range, the laser treatment does not significantly modify the structure and constitution of dentin. The results achieved suggest an ablation mechanism where collagen is preferentially decomposed by the laser radiation, reducing the tissue cohesive strength and leading, ultimately, to its ablation.

Paper Details

Date Published: 21 December 2016
PDF: 7 pages
J. Biomed. Opt. 21(12) 125007 doi: 10.1117/1.JBO.21.12.125007
Published in: Journal of Biomedical Optics Volume 21, Issue 12
Show Author Affiliations
Quang-Tri Le, Instituto Superior Técnico (Portugal)
Institut de Chimie de la Matière Condensée de Bordeaux (France)
Caroline Bertrand, Institut de Chimie de la Matière Condensée de Bordeaux (France)
Rui Vilar, Instituto Superior Técnico (Portugal)

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