Infrared absorption bands characterization of dentin tissue when irradiated by erbium laser
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2002
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INTERNATIONAL CONGRESS ON LASERS IN DENTISTRY, 8th; ANNUAL MEETING OF THE JAPANESE SOCIETY FOR LASER DENTISTRY, 14th
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The erbium laser radiation is highly absorbed by water molecules present in hard tissues. Erbium laser irradiation effects can be
classified in two different regimens: ablative, which produces material removal or sub-ablative, that produces a controlled heated
process in the irradiated and adjacent regions. For the Er:YAG laser the ablative threshold is very low, around 1.5J/cm2. When
dentin is irradiated bellow threshold, chemical and physical changes can occur. The objective of this work is to identify the
infrared absorption changes at dentin tissue induced by the Er:YAG laser irradiation al 2.94 μm with sub-ablative energy
densities. In this work it were used energy densities between 0.365 J/cm2 and 1.94 J/cm2 to irradiate 0.5mm slices of bovine
dentin. For the infrared analysis a Fourier Transform Infrared spectrometer was used. The studied region was between 4000 cm-1 and 400cm-1 (2.5μm and 25μm). After the laser irradiation, two main changes were observed in the analyzed spectral region: loss
of water and alteration in the structure of organic matrix. These alterations can be identified by intensity decrease of the water
band between 3800cm-1 and 2800cm-1 and in those bands between 1400cm-1 and 1100cm-1. Only a partial reversion of the water
band pattern was observed after 24 hours of hydration, suggesting that erbium laser produces an irreversible alteration in the
structure of the organic matrix when irradiated with energy densities bellow the ablation threshold.
Como referenciar
ZEZELL, D.M.; BACHMANN, L.; DIEBOLDER, R.; HIBST, R. Infrared absorption bands characterization of dentin tissue when irradiated by erbium laser. In: INTERNATIONAL CONGRESS ON LASERS IN DENTISTRY, 8th; ANNUAL MEETING OF THE JAPANESE SOCIETY FOR LASER DENTISTRY, 14th, July 31 - August 2, 2002, Yokohama, Japan. Abstract... Aachen, Alemanha: International Society for Laser in Dentistry, 2002. p. 57-57. Disponível em: http://repositorio.ipen.br/handle/123456789/32351. Acesso em: 20 Mar 2025.
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