Effect of low energy laser irradiation on mechanical expansion of the rat sagittal suture

Abstract

I studied the therapeutic effects of low energy lasers on the mechanical expansion of the sagittal suture of rats using both the Ga-Al-As semiconductor and He-Ne lasers. Histological examination and quantitative analysis showed that active tissue remodelling was prominent in the laser irradiation groups. However, collagen degeneration resulted from the irradiation. Image analysis indicated that new bone formation was more evident in the laser irradiated group than in the non-irradiated group. It was also found that although laser irradiation promoted bone remodelling, neither the duration nor the type of irradiation produced significant differences.