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Proceedings Paper

Hard-tissue ablation with pulsed CO2 lasers
Author(s): Thomas P. Ertl; Gerhard J. Mueller
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Paper Abstract

CO2 Lasers at (lambda) equals 9.6 and 10.6 micrometers and pulse lengths in the range of 100 ns to 150 micrometers operating in multimode were used as a drilling instrument with energy densities up to 200 J/cm2. The laser light was focused perpendicularly onto the surface of 1 mm slices of dentin and enamel. Different methods of cooling were applied. Temperatures were measured during ablation with thermocouples. The quality of ablation was checked with a stereo microscope and the diameters of the ablated areas were measured. Ablation rates (mm3/s) and ablation efficiencies (mm3/J) were calculated. Best results were obtained with pulse lengths of 100 to 130 micrometers . Ablation without carbonization of the organic matrix of dentin was only possible with water or water/air spray cooling. Ablation rates of up to 0.2 mm3/s and an ablation efficiency of up to 50 X 10-3 mm3/J were reached.

Paper Details

Date Published: 21 July 1993
PDF: 6 pages
Proc. SPIE 1880, Lasers in Orthopedic, Dental, and Veterinary Medicine II, (21 July 1993); doi: 10.1117/12.148321
Show Author Affiliations
Thomas P. Ertl, Freie Univ. Berlin (Germany)
Gerhard J. Mueller, Freie Univ. Berlin (Germany)

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

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