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The purpose of the present study was to investigate the effect of laser irradiation on calcified nodule formation in human dental pulp (HDP) cells. HDP cells were irradiated once with a Ga-Al-As laser for 5 and 10 min, and calcified nodule formation was determined by von Kossa staining. The laser irradiation increased the number of calcified nodules in a time-dependent manner. The activity of alkaline phosphatase and production of collagen and osteocalcin in conditioned medium were measured. Both were higher in the irradiated group than in the nonirradiated group. These results suggested that formation of calcified nodules in HDP cells, as well as in alkaline phosphatase activity, the production of collagen and osteocalcin were enhanced by laser irradiation.
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