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Proceedings Paper

YAG lasers in restorative dentistry: a histological investigation
Author(s): Hans J. Koort; Matthias Frentzen D.D.S.
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Paper Abstract

An important indicator to prove the effectiveness of laser radiation and to control the side effects are histological studies of dental hard tissues. In our study, different pulsed, rare earth doped YAG-laser systems in the range from 1 micrometers to 3 micrometers were investigated. An improved plastic embedding technique based on a penetrating uv-activated PMMA-medium was developed to cut undecalcified sections of 15 micrometers thickness. The Nd:YAG laser showed wide zones of necrosis but little carbonization. The radiation of Holmium and Thullium-doped YAG lasers causes strong but well-defined zones of carbonization comparable to those of pulsed (ms) CO2 lasers. The Erbium-doped YAG-laser was the most effective system. As predominant side effects, residual zones of debris and microcracks were observed. In deeper cavities, the zones of damages increase. The side effects of the pulsed infrared laser types seem to be mainly influenced by the physical or chemical properties of the dental tissues and not by the selected laser parameters.

Paper Details

Date Published: 1 June 1992
PDF: 9 pages
Proc. SPIE 1643, Laser Surgery: Advanced Characterization, Therapeutics, and Systems III, (1 June 1992); doi: 10.1117/12.137372
Show Author Affiliations
Hans J. Koort, Univ. of Bonn (Germany)
Matthias Frentzen D.D.S., Univ. of Bonn (Germany)

Published in SPIE Proceedings Vol. 1643:
Laser Surgery: Advanced Characterization, Therapeutics, and Systems III
R. Rox Anderson M.D., Editor(s)

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