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Increased viability of odontoblast-like cells subjected to low-level laser irradiation

  • Laser Methods in Chemistry, Biology, and Medicine
  • Published:
Laser Physics

Abstract

Studies have shown that the increase of cell metabolism depends on the low level laser therapy (LLLT) parameters used to irradiate the cells. However, the optimal laser dose to up-regulate pulp cell activity remains unknown. Consequently, the aim of this study was to evaluate the metabolic response of odontoblast-like cells (MDPC-23) exposed to different LLLT doses. Cells at 20000 cells/cm2 were seeded in 24-well plates using plain culture medium (DMEM) and were incubated in a humidified incubator with 5% CO2 at 37°C. After 24 h, the culture medium was replaced by fresh DMEM supplemented with 5% (stress by nutritional deficit) or 10% fetal bovine serum (FBS). The cells were exposed to different laser doses from a near infrared diode laser prototype designed to provide a uniform irradiation of the wells. The experimental groups were: G1: 1.5 J/cm2 + 5% FBS; G2: 1.5 J/cm2 + 10% FBS; G3: 5 J/cm2 + 5% FBS; G4: 5 J/cm2 + 10% FBS; G5: 19 J/cm2 + 5% FBS; G6: 19 J/cm2 + 10% FBS. LLLT was performed in 3 consecutive irradiation cycles with a 24-hour interval. Non-irradiated cells cultured in DMEM supplemented with either 5 or 10% FBS served as control groups. The analysis of the metabolic response was performed by the MTT assay 3 h after the last irradiation. G1 presented an increase in SDH enzyme activity and differed significantly (Mann-Whitney test, p < 0.05) from the other groups. Analysis by scanning electron microscopy showed normal cell morphology in all groups. Under the tested conditions, LLLT stimulated the metabolic activity of MDPC-23 cultured in DMEM supplemented with 5% FBS and exposed to a laser dose of 1.5 J/cm2. These findings are relevant for further studies on the action of near infrared lasers on cells with odontoblast phenotype.

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Authors and Affiliations

  1. UNESP-Univ. Estadual Paulista, Araraquara School of Dentistry, Araraquara, SP, 14801-903, Brazil

    C. F. Oliveira, J. Hebling & C. A. de Souza Costa

  2. UNICAMP-Universidade de Campinas, Piracicaba School of Dentistry, Piracicaba, SP, 13414-903, Brazil

    F. G. Basso

  3. USP-Universidade de São Paulo, Physics Institute of São Carlos, São Carlos, SP, 13560-970, Brazil

    E. C. Lins, C. Kurachi & V. S. Bagnato

Authors
  1. C. F. Oliveira
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  2. F. G. Basso
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  3. E. C. Lins
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  4. C. Kurachi
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  5. J. Hebling
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  6. V. S. Bagnato
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  7. C. A. de Souza Costa
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Correspondence to C. A. de Souza Costa.

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Original Text © Astro, Ltd., 2010.

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Oliveira, C.F., Basso, F.G., Lins, E.C. et al. Increased viability of odontoblast-like cells subjected to low-level laser irradiation. Laser Phys. 20, 1659–1666 (2010). https://doi.org/10.1134/S1054660X10130153

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  • DOI: https://doi.org/10.1134/S1054660X10130153

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