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24 March 2000 Morphological comparison between nano- and picosecond laser ablation in enamel
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Proceedings Volume 3910, Lasers in Dentistry VI; (2000)
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States
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.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Rosane F. Z. Lizarelli D.D.S., Cristina Kurachi, Lino Misoguti, and Vanderlei Salvador Bagnato "Morphological comparison between nano- and picosecond laser ablation in enamel", Proc. SPIE 3910, Lasers in Dentistry VI, (24 March 2000);


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