Almeida LDFDD, Basso FG, Turrioni APS, de-Souza-Costa CA, Hebling J. "Metabolism of Odontoblast-like cells submitted to transdentinal irradiation with blue and red LED".
Arch Oral Biol 2017;
83:258-264. [PMID:
28841473 DOI:
10.1016/j.archoralbio.2017.08.004]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 07/10/2017] [Accepted: 08/07/2017] [Indexed: 12/16/2022]
Abstract
OBJECTIVES
The present study evaluated the trans-dentinal effect of light emitting diodes (LEDs) irradiation on the metabolism of odontoblast-like cells.
METHODS
Seventy-two dentin discs (0.2mm thick) were obtained from human molar teeth. MDPC-23 cells (20,000 cells/disc) were seeded on the pulpal side of the discs using DMEM, supplemented with 10% fetal bovine serum (FBS). After 12h, the culture medium was replaced with DMEM containing 0.5% FBS. After additional 12h, blue (455±10nm) or red (630±10nm) LEDs were used at irradiances of 80 and 40mW/cm2, respectively, to irradiate the occlusal side of the discs. The energy doses were fixed at 2 or 4J/cm2. Cell viability, alkaline phosphatase activity (ALP), total protein production and collagen synthesis were evaluated 72h after irradiation. Data were submitted to Kruskal-Wallis and Mann-Whitney tests (α=0.05).
RESULTS
Red light promoted proliferative effects at the energy dose of 4J/cm2. Conversely, cell cultures irradiated with 2J/cm2 emitted by the blue light showed reduced viability. ALP production was stimulated by red light in comparison with blue light at 4J/cm2. Total protein production was reduced after exposure to blue light at 4J/cm2, while no effect was observed on collagen production.
CONCLUSIONS
Irradiation with red LED at 4J/cm2 bio-stimulated the viability of odontoblast-like cells, whilst blue light had unfavorable effects on the cellular metabolism.
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