Femtosecond laser ablation of dentin and enamel: relationship between laser fluence and ablation efficiency

Hu Chen; Jing Liu; Hong Li; Wenqi Ge; Yuchun Sun; Yong Wang; Peijun Lü

doi:10.1117/1.JBO.20.2.028004

19 February 2015 Femtosecond laser ablation of dentin and enamel: relationship between laser fluence and ablation efficiency

Hu Chen, Jing Liu, Hong Li, Wenqi Ge, Yuchun Sun, Yong Wang, Peijun Lü

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Journal of Biomedical Optics, Vol. 20, Issue 2, 028004 (February 2015). https://doi.org/10.1117/1.JBO.20.2.028004

Abstract

The objective was to study the relationship between laser fluence and ablation efficiency of a femtosecond laser with a Gaussian-shaped pulse used to ablate dentin and enamel for prosthodontic tooth preparation. A diode-pumped thin-disk femtosecond laser with wavelength of 1025 nm and pulse width of 400 fs was used for the ablation of dentin and enamel. The laser spot was guided in a line on the dentin and enamel surfaces to form a groove-shaped ablation zone under a series of laser pulse energies. The width and volume of the ablated line were measured under a three-dimensional confocal microscope to calculate the ablation efficiency. Ablation efficiency for dentin reached a maximum value of 0.020 mm³/J when the laser fluence was set at 6.51 J/cm². For enamel, the maximum ablation efficiency was 0.009 mm³/J at a fluence of 7.59 J/cm². Ablation efficiency of the femtosecond laser on dentin and enamel is closely related to the laser fluence and may reach a maximum when the laser fluence is set to an appropriate value.

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Hu Chen, Jing Liu, Hong Li, Wenqi Ge, Yuchun Sun, Yong Wang, and Peijun Lü "Femtosecond laser ablation of dentin and enamel: relationship between laser fluence and ablation efficiency," Journal of Biomedical Optics 20(2), 028004 (19 February 2015). https://doi.org/10.1117/1.JBO.20.2.028004

Published: 19 February 2015

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