The ablation threshold of Er;Cr:YSGG laser radiation in bone tissue

Carolina Benetti; Denise Maria Zezell

doi:10.1117/12.2180712

19 June 2015 The ablation threshold of Er;Cr:YSGG laser radiation in bone tissue

Carolina Benetti, Denise Maria Zezell

Proceedings Volume 9531, Biophotonics South America; 95313H (2015) https://doi.org/10.1117/12.2180712
Event: SPIE Biophotonics South America, 2015, Rio de Janeiro, Brazil

Abstract

In laser cut clinical applications, the use of energy densities lower than the ablation threshold causes increase of temperature of the irradiated tissue, which might result in an irreversible thermal damage. Hence, knowing the ablation threshold is crucial for insuring the safety of these procedures. The aim of this study was to determine the ablation threshold of the Er,Cr:YSGG laser in bone tissue. Bone pieces from jaws of New Zealand rabbits were cut as blocks of 5 mm × 8 mm and polished with sandpaper. The Er,Cr:YSGG laser used in this study had wavelength of 2780 nm, 20 Hz of frequency, and the irradiation condition was chosen so as to simulate the irradiation during a surgical procedure. The laser irradiation was performed with 12 different values of laser energy densities, between 3 J/cm² and 42 J/cm², during 3 seconds, resulting in the overlap of 60 pulses. This process was repeated in each sample, for all laser energy densities. After irradiation, the samples were analyzed by scanning electron microscope (SEM), and it was measured the crater diameter for each energy density. By fitting a curve that related the ablation threshold with the energy density and the corresponding diameter of ablation crater, it was possible to determine the ablation threshold. The results showed that the ablation threshold of the Er,Cr:YSGG in bone tissue was 1.95±0.42 J/cm².

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Carolina Benetti and Denise Maria Zezell "The ablation threshold of Er;Cr:YSGG laser radiation in bone tissue", Proc. SPIE 9531, Biophotonics South America, 95313H (19 June 2015); https://doi.org/10.1117/12.2180712

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KEYWORDS

Laser ablation

Laser damage threshold

Bone

Laser tissue interaction

Tissues

Laser energy

Scanning electron microscopy

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