抄録
The effect of acceleration wound healing by irradiating low energy and polarized light was studied using near infra-red Light Emission Diodes (LED) which is maximal at 840nm and half width of 20nm. The polarized light were linear polarized light and right and left hand circular polarized light. Two circular wounds were made on the back of a Wister strain male rat. Of the two wounds, the right side was irradiated while the left side not irradiated. The condition of irradiation was as follows: power density; 2J/cm, energy density; 8mW/cm irradiation interval; 24hr. The initial wound area had been defind as 100% and the rate of contraction of the wound has been measured during 48hr interval. The rate of contraction irradiated wound was larger than that of non-irradiated one. But we have not found significantly difference between the healing of irradiated and non-irradiated sides. And there were no difference in the acceleration effect of wound healing among the kinds of polarized light. In the case of the irradiation was done in the other condition of irradiation (power density; 2J/cm, energy density; 17mW/cm, irradiation interval; 48hr), linear and right hand circular polarized light were more effective than the other polarized light. We think that the threshold of the biostimulation effect changes with the kinds of polarized light. In other words, it is suspected that the optimal condition of irradiation for the acceleration wound healing is different among the kinds of polarized light.
