Effects of femtosecond laser irradiation on osseous tissues

The study of the interaction of intense laser light with matter, as well as transient response of atoms and molecules is very appropriated because of the laser energy concentration in a femtosecond optical pulses. The fundamental problem to be solved is to find tools and techniques which allow us to observe and manipulate on a femtosecond time scale the photonics events on and into the matter. Six third human extracted molars were exposed to a femtosecond Ti:Sapphire Q-switched and mode locked laser (Libra-S, Coherent, Palo Alto, CA, USA), emitting pulses with 70 fs width, radiation wavelength of 801 nm, at a constant pulse repetition rate of 1 KHz. The laser was operated at different power levels (70 to 400 mW) with constant exposition time of 10 seconds, at focused and defocused mode. Enamel and dentin surfaces were evaluated concerned ablation rate and morphological aspects under scanning electron microscopic. The results in this present experiment suggest that at the focused mode and under higher average power, enamel tissues present microcavities with higher depth and very precise edges, but, while dentin shows a larger melt-flushing, lower depth and melting and solidification aspect. In conclusion, it is possible to choose hard or soft ablation, under lower and higher average power, respectively, revealing different aspects of dental enamel and dentin, depending on the average power, fluence and distance from the focal point of the ultra-short pulse laser on the tooth surface.

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“…This study is very close to others [11,24,25] and contributes with a new method for restorative and aesthetic dentistry.…”

Section: Resultssupporting

confidence: 81%

Selective ablation of dental enamel and dentin using femtosecond laser pulses

et al. 2007

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“…The use of lasers in the medical field, as an instru ment for contact free tissue removal of dental hard tis sues [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], osseous tissues [33][34][35] have been stud ied as a means for complementing conventional drill ing or cutting tools. In all applications, a balance between several phenomena must be taken into con sideration.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser ablation on dental hard tissues—Analysis of ablated profile near an interface using local effective intensity

et al. 2011

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“…This process is relevant for laser applications ranging from medicine and engineering to fundamental science. [1][2][3][4] In industry nanosecond lasers are widely used in various micro-machining processes, such as material welding, 5 cutting, 6 and ablation. [7][8][9][10][11] The short-lived laser-induced temperature pulses in the heated region determine the conditions that may lead to material damage, phase transitions, and melting.…”

mentioning

confidence: 99%

Nanosecond laser pulse heating of a platinum surface studied by pump-probe X-ray diffraction

Shayduk

Vonk

Arndt

et al. 2016

Applied Physics Letters

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We report on the quantitative determination of the transient surface temperature of Pt(110) upon nanosecond laser pulse heating. We find excellent agreement between heat transport theory and the experimentally determined transient surface temperature as obtained from time-resolved X-ray diffraction on timescales from hundred nanoseconds to milliseconds. Exact knowledge of the surface temperature's temporal evolution after laser excitation is crucial for future pump-probe experiments at synchrotron storage rings and X-ray free electron lasers.

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Effects of femtosecond laser irradiation on osseous tissues

Abstract: These experiments demonstrate that fs lasers used for bone tissue cutting do not appear to generate significant temperature transients to inactivate proteins and that cellular membrane integrity is disrupted for only a few cell layers.

Cited by 67 publications

References 42 publications

Selective ablation of dental enamel and dentin using femtosecond laser pulses

Selective ablation of dental enamel and dentin using femtosecond laser pulses

Femtosecond laser ablation on dental hard tissues—Analysis of ablated profile near an interface using local effective intensity

Nanosecond laser pulse heating of a platinum surface studied by pump-probe X-ray diffraction

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