1997 年 9 巻 3 号 p. 121-129
Many studies using low level laser irradiation (LLLI) have been performed to investigate the influence of laser irradiation on the healing process of wounds. It has been proposed that LLLI may stimulate the growth of bacterial cells and normal tissue cells. This study was performed to determine whether LLLI also has positive effects on the proliferation of Staphylococcus arueus, known as a common cause of skin infections, and to obtain basic data for a future in vivo experiment to study the effect of LLLI on wounds infected with S. aureus. This study includes 3 experiments: experiments for the proliferation of S. Aaureus according to (a) the LLLI pulse type, (b) the interirradiation interval and (c) the irradiation time. The experiment assessing the effect of LLLI by pulse type and energy density, pulse 13 ( P13, 6000 Hz, 14 mW of average output power) was most effective in increasing the proliferation of S. Aureus. As for the interirradiation interval (also using P13), the 4 hour interval was the most effective; 2 minutes of irradiation had a significant effect on the proliferation of S. arueus using P13 and 4 hour interval ( energy density of 14.8 mJ/cm2 ).
