Influence of different laser wavelengths on the ablation characteristics of healthy dentin

Peter Rechmann D.D.S.; Thomas Hennig

doi:10.1117/12.197591

23 December 1994 Influence of different laser wavelengths on the ablation characteristics of healthy dentin

Peter Rechmann D.D.S., Thomas Hennig

Proceedings Volume 2327, Medical Applications of Lasers II; (1994) https://doi.org/10.1117/12.197591
Event: International Symposium on Biomedical Optics Europe '94, 1994, Lille, France

Abstract

Engaging four different pulsed laser systems emitting in the near ultraviolet (wavelength 355 nm, wavelength 377 nm), in the near infrared (wavelength 755 nm), and in the mid infrared (wavelength 2.9 micrometers ) spectral region ablation thresholds of healthy dentin were determined. During experiments with an Alexandrite-laser (wavelengths 377 nm and 755 nm) a pulse duration of 200 ns was used, whereas at wavelength 355 nm pulse duration was fixed at 9 ns and at wavelength 2.9 micrometers pulse duration was set to 200 ns again. Using laser wavelengths which are well absorbed by the target (near UV, mid infrared) two well defined ablation thresholds could be detected. Due to low absorption of near infrared wavelengths in healthy dentin, high fluences must be engaged for ablation of healthy dentin. In this spectral region only a more or less statistically appearing ablation threshold can be observed. Caused by high fluences unpredictable plasma formation takes place. Even so, short pulse duration leads to high peak power, thus originating plasma.

Citation Download Citation

Peter Rechmann D.D.S. and Thomas Hennig "Influence of different laser wavelengths on the ablation characteristics of healthy dentin", Proc. SPIE 2327, Medical Applications of Lasers II, (23 December 1994); https://doi.org/10.1117/12.197591

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