Research Papers: General

Structural modifications induced in dentin by femtosecond laser

[+] Author Affiliations
Quang-Tri Le

Lisbon University, Instituto Superior Técnico and CeFEMA, Center of Physics and Engineering of Advanced Materials, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal

Laboratoire ICMCB, CNRS-UPR9048, 87 Avenue du Dr. Albert Schweitzer, 33608 Pessac Cedex, France

Caroline Bertrand

Laboratoire ICMCB, CNRS-UPR9048, 87 Avenue du Dr. Albert Schweitzer, 33608 Pessac Cedex, France

Rui Vilar

Lisbon University, Instituto Superior Técnico and CeFEMA, Center of Physics and Engineering of Advanced Materials, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal

J. Biomed. Opt. 21(12), 125007 (Dec 21, 2016). doi:10.1117/1.JBO.21.12.125007
History: Received October 3, 2016; Accepted November 30, 2016
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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/cm2, 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/cm2 presented an irregular morphology with exposed dentinal tubules and no evidence of thermal effects. For 7 and 14  J/cm2, 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/cm2. 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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Quang-Tri Le ; Caroline Bertrand and Rui Vilar
"Structural modifications induced in dentin by femtosecond laser", J. Biomed. Opt. 21(12), 125007 (Dec 21, 2016). ; http://dx.doi.org/10.1117/1.JBO.21.12.125007


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