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Proceedings Paper

Mathematical simulation of the thermal diffusion in dentine irradiated with Nd:YAG laser using finite difference method
Author(s): Eduardo H. Moriyama; Renato Amaro Zangaro; Paulo Davi de Castro Lobo; Antonio G. J. Balbin Villaverde; Ii-Sei Watanabe; Marcos T. T. Pacheco; Daniel K. Otsuka
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Paper Abstract

Thermal damage in dental pulp during Nd:YAG laser irradiation have been studied by several researchers; but due to dentin inhomogeneous structure, laser interaction with dentin in the hypersensitivity treatment are not fully understood. In this work, heat distribution profile on human dentine samples irradiated with Nd:YAG laser was simulated at surface and subjacent layers. Calculations were carried out using the Crank-Nicolson's finite difference method. Sixteen dentin samples with 1,5 mm of thickness were evenly distributed into four groups and irradiated with Nd:YAG laser pulses, according to the following scheme: (I) 1 pulse of 900 mJ, (II) 2 pulses of 450 mJ, (III) 3 pulses of 300 mJ, (IV) 6 pulses of 150 mJ; corresponding to a total laser energy of 900 mJ. The pulse interval was 300ms, the pulse duration of 900 ms and irradiated surface area of 0,005 mm2. Laser induced morphological changes in dentin were observed for all the irradiated samples. The heat distribution throughout the dentin layer, from the external dentin surface to the pulpal chamber wall, was calculated for each case, in order to obtain further information about the pulsed Nd:YAG laser-oral hard tissue interaction. The simulation showed significant differences in the final temperature at the pulpal chamber, depending on the exposition time and the energy contained in the laser pulse.

Paper Details

Date Published: 3 June 2002
PDF: 7 pages
Proc. SPIE 4610, Lasers in Dentistry VIII, (3 June 2002); doi: 10.1117/12.469305
Show Author Affiliations
Eduardo H. Moriyama, Univ. do Vale do Paraiba (Brazil)
Renato Amaro Zangaro, Univ. do Vale do Paraiba (Brazil)
Paulo Davi de Castro Lobo, Univ. do Vale do Paraiba (Brazil)
Antonio G. J. Balbin Villaverde, Univ. do Vale do Paraiba (Brazil)
Ii-Sei Watanabe, Univ. de Sao Paulo (Brazil)
Marcos T. T. Pacheco, Univ. do Vale do Paraiba (Brazil)
Daniel K. Otsuka, Univ. do Vale do Paraiba (Brazil)

Published in SPIE Proceedings Vol. 4610:
Lasers in Dentistry VIII
Peter Rechmann; Daniel Fried; Thomas Hennig, Editor(s)

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