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To evaluate the effect of irradiation with light-emitting diode (LED; 455 nm) on the viability and synthesis of dentin matrix proteins by odontoblast-like cells, MDPC-23 cells were cultivated (104 cells/cm2) in 24-well culture plates. After 12 h incubation in Dulbecco’s modified Eagle’s medium (DMEM), the cells were submitted to nutritional restriction by means of reducing the concentration of fetal...