Abstract
The purpose of this study is to evaluate the effect of low power laser on human gingivalmicrocirculation. In normal periodontal tissue, experimental gingivitis was caused in the upperanterior jaw of the 17 subjects by interrupting tooth brushing. After 0, 2 and 4 days and 1, 2 and 3 weeks of plaque accumulation, the gingiva was irradiated by Ga-Al-As laser (60mW). Beforelaser irradiation, immediately and respectively 30 minutes after laser irradiation, the gingival bloodflow and the gingival crevicular fluid was measured. At the same time, the shape of the bloodvessels beneath the oral sulcular epithelium was also estimated.The results were as follows:1. In the first stage of gingivitis, blood flow was increased by laser irradiation.2. By laser irradiation, no morphological change was observed in the blood vessels in anystage of gingivitis.3. By laser irradiation, there was no significant quantitative change in the gingival crevicularfluid in any stage of gingivitis, however it decreased as a whole.These results suggest that low power laser may improve the gingival circulation in the firststage of gingivitis.
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