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Proceedings Paper

Morphological comparison between nano- and picosecond laser ablation in enamel
Author(s): Rosane F. Z. Lizarelli; Cristina Kurachi; Lino Misoguti; Vanderlei Salvador Bagnato
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Paper Abstract

Human enamel tissue has been exposed to Nd:YAG pulsed laser operating in nanosecond and picosecond pulse regime. Morphological comparison between the regimes of operation have been investigated special attention to preservation of structure was taken. Trains of pulses with picosecond duration from a Q-switched and mode-locked Nd:YAG laser and pulses with nanosecond duration from a Q-switched Nd:YAG laser both operating at 15 Hz kept at in same average power, were focused in human sound molar during 30 s. Drilled holes with different morphological characteristics were observed for several laser intensity regime. Enamel surfaces were examined in a scanning electron microscope and their morphological characteristics compared. Contrast between the morphology of the enamel when treated with different powers and lasers pulse duration were observed. Picosecond pulses promote a better defined material removal while nanosecond pulses at the equivalent average power level causes a large intermediate modified region between ablated and normal tissue, as well as a complete superficial modification of the existent original structure. Results show an important correlation between the surface morphology and the pulse width of the lasers, giving indications towards the use of ultrashort laser pulses in Dentistry.

Paper Details

Date Published: 24 March 2000
PDF: 9 pages
Proc. SPIE 3910, Lasers in Dentistry VI, (24 March 2000); doi: 10.1117/12.380825
Show Author Affiliations
Rosane F. Z. Lizarelli, Univ. de Sao Paulo (Brazil)
Cristina Kurachi, Univ. de Sao Paulo (Brazil)
Lino Misoguti, Univ. de Sao Paulo (Brazil)
Vanderlei Salvador Bagnato, Univ. de Sao Paulo (Brazil)


Published in SPIE Proceedings Vol. 3910:
Lasers in Dentistry VI
John D. B. Featherstone; Peter Rechmann; Daniel Fried, Editor(s)

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