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Proceedings Paper

Low-threshold ablation of enamel and dentin using Nd:YAG laser assisted with chromophore with different pulse shapes
Author(s): Stefano Bonora; Paolo Benazzato; Alessandro Stefani; Paolo Villoresi
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Paper Abstract

Neodimium laser treatment has several drawbacks when used in the hard tissue cutting, because of the low absorption of the dental tissues at its wavelength. This investigation proved that the Nd:YAG radiation is a powerful ablation tool if it is used with the dye assisted method. Several in vitro tests on enamel and dentin were accomplished changing some laser parameters to have different pulse shapes and durations from 125μs up to 1.4ms. The importance of short time high power peaks, typical of crystal lasers, in the ablation process was investigated. The pulse shapes were analyzed by their intensity in space and time profiles. A first set of results found the optimum dye concentration be used in all the following tests. Furthermore the ablation threshold for this technique was found for each different pulse shapes and durations. A low energy ablation method was found to avoid temperature increase and surface cracks formation. In vitro temperature analysis was reported comparing the differences between no dye application laser treatment and with a dye spray applied. A strong reduction of the temperature increase was found in the dye assisted method. A discussion on the general findings and their possible clinical applications is presented.

Paper Details

Date Published: 28 May 2004
PDF: 8 pages
Proc. SPIE 5313, Lasers in Dentistry X, (28 May 2004); doi: 10.1117/12.529239
Show Author Affiliations
Stefano Bonora, LUXOR, INFM (Italy)
Univ. degli Studi di Padova (Italy)
Paolo Benazzato, Private Dentist (Italy)
Alessandro Stefani, Private Dentist (Italy)
Paolo Villoresi, LUXOR, INFM (Italy)
Univ. degli di Padova (Italy)

Published in SPIE Proceedings Vol. 5313:
Lasers in Dentistry X
Peter Rechmann D.D.S.; Daniel Fried; Thomas Hennig, Editor(s)

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