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Proceedings Paper

Inhibition of enamel remineralization with blue LED: an in vitro study
Author(s): Ilka Tiemy Kato D.D.S.; Fausto Medeiros Mendes D.D.S.; Denise Maria Zezell; Anderson Zanardi de Freitas; Marcus Paulo Raele; Niklaus Ursus Wetter
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Paper Abstract

Blue light, especially from LED devices, is a tool very frequently used in dental procedures. However, the investigations of its effects on dental enamel are focused primarily on enamel demineralization and fluoride retention. Despite the fact that this spectral region can inhibit enamel demineralization, the consequences of the irradiation on demineralized enamel are not known. For this reason, we evaluated the effects of blue LED on enamel remineralization. Artificial lesions formed in bovine dental enamel samples by immersion in undersaturated acetate buffer were divided into three groups. In the first group (DE), the lesions were not submitted to any treatment. In the second (RE), the lesions were submitted to remineralization. The lesions from the third group (LED+RE) were irradiated with blue LED (455nm, 1.38W/cm2, 13.75J/cm2 and 10s) before the remineralization. Cross-sectional microhardness was used to assess mineral changes induced by remineralization under pH-cycling. The mineral deposition occurred preferably in the middle portion of the lesions. Specimens from group RE showed higher hardness value than the DE ones. On the other hand, the mean hardness value of the LED+RE samples was not statistically different from the DE samples. Results obtained in the present study show that the blue light is not innocuous for the dental enamel and inhibition of its remineralization can occur.

Paper Details

Date Published: 18 February 2009
PDF: 7 pages
Proc. SPIE 7162, Lasers in Dentistry XV, 71620H (18 February 2009); doi: 10.1117/12.809725
Show Author Affiliations
Ilka Tiemy Kato D.D.S., Instituto de Pesquisas Energéticas e Nucleares (Brazil)
Fausto Medeiros Mendes D.D.S., Univ. de São Paulo (Brazil)
Denise Maria Zezell, Instituto de Pesquisas Energéticas e Nucleares (Brazil)
Anderson Zanardi de Freitas, Instituto de Pesquisas Energéticas e Nucleares (Brazil)
Marcus Paulo Raele, Instituto de Pesquisas Energéticas e Nucleares (Brazil)
Niklaus Ursus Wetter, Instituto de Pesquisas Energéticas e Nucleares (Brazil)

Published in SPIE Proceedings Vol. 7162:
Lasers in Dentistry XV
Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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