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Proceedings Paper

Mechanism of Er:YAG laser-induced ablation of dental hard substances
Author(s): Raimund Hibst; Ulrich Keller D.D.S.
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Paper Abstract

Er:YAG laser ablation was investigated by fast photography in a Schlieren optic setup. The results support the idea of continuous, thermally driven microexplosion type of ablation, which is based on the inhomogeneous distribution of strong (water) and weak absorbers (hydroxyapatite). Sudden vaporization and heating of the water content leads to a very effective material removal by bursting off the solid tissue components. Material is ejected in the form of particles when the threshold energy density for ablation (about 3 J cm-2) is reached. For high radiant exposure, initial plume velocity is in the order of the speed of sound in air. After leaving the tissue surface, particles are heated by the still incoming laser radiation, causing glowing and melting. No surface plasma and only weak pressure waves caused by individual spikes were observed.

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: 10.1117/12.148318
Show Author Affiliations
Raimund Hibst, Institute for Lasertechnology in Medicine/Univ. of Ulm (Germany)
Ulrich Keller D.D.S., Univ. of Ulm Dental School (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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