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Proceedings Paper

Effects of pulsed CO2 and Er:YAG lasers on enamel and dentin
Author(s): Matjaz Lukac; Franci Hocevar; Simona Cencic; Karolj N. Nemes; Ulrich Keller; Raimund Hibst; Dusan Sustercic; Boris Gaspirc; Uros Skaleric; Nenad Funduk
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Paper Abstract

Enamel and dentin samples were exposed extraorally to pulsed TEA CO2 lasers with pulse durations of 1 microsecond(s) ec and 0.1 microsecond(s) ec. The ablation rate is for energy densities above 5 J/cm2 independent of the CO2 laser energy. For 1 microsecond(s) long CO2 pulses the ablation rate is 3 micrometers /pulse for drilling in enamel, and 8 micrometers /pulse for drilling in dentin. Drilling with 0.1 microsecond(s) CO2 laser results in lower ablation rates of approximately 1 micrometers /pulse in enamel, and 4 micrometers /pulse in dentin. At all experimental energy densities plasma formation is observed, effectively reducing the amount of energy deposition. Compared with these results, experiments with the Er:YAG laser show that 200 microsecond(s) long Er:YAG laser pulses achieve better ablation in the high energy density range because ablation is not diminished as rapidly by the plasma formation. The Er:YAG laser saturated ablation rates are approximately 60 micrometers /pulse for drilling in dentin and 40 micrometers /pulse for drilling in enamel.

Paper Details

Date Published: 21 July 1993
PDF: 7 pages
Proc. SPIE 1880, Lasers in Orthopedic, Dental, and Veterinary Medicine II, (21 July 1993); doi: 10.1117/12.148320
Show Author Affiliations
Matjaz Lukac, ISKRA-Electrooptika (Slovenia)
Franci Hocevar, ISKRA-Electrooptika (Slovenia)
Simona Cencic, ISKRA-Electrooptika (Slovenia)
Karolj N. Nemes, ISKRA-Electrooptika (Slovenia)
Ulrich Keller, Univ. of Ulm (Germany)
Raimund Hibst, Univ. of Ulm (Germany)
Dusan Sustercic, Univ. Dental Clinic,/Ljubljana (Slovenia)
Boris Gaspirc, Univ. Dental Clinic,/Ljubljana (Slovenia)
Uros Skaleric, Univ. Dental Clinic,/Ljubljana (Slovenia)
Nenad Funduk, Univ. Dental Clinic,/Ljubljana (Slovenia)

Published in SPIE Proceedings Vol. 1880:
Lasers in Orthopedic, Dental, and Veterinary Medicine II
Dov Gal; Stephen J. O'Brien; C. T. Vangsness; Joel M. White; Harvey A. Wigdor, Editor(s)

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