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The aim of this study is to histologically compare effects of blue light-emitting diode (LED) light (400-490 nm) and Ga-Al-As low-level diode laser light (980 nm) on bone regeneration of calvarial critical-sized defects in rats. Thirty Wistar Albino rats were included in the study. The experimental groups were as follows: blue LED light (400-490 nm) group (LED); 980-nm low-level laser light group (LL); and no-treatment, control group (CL). A critical-sized defect of 8 mm was formed on calvaria of rats. Each animal was sacrificed 21 days after defect formation.
