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The purpose of this study was to determine the microbiotal changes of Adult Periodontitis and Rapid Progressive Periodontitis patients after plaque control. Twenty-one individuals, tem patients who had the Adult Periodontitis and eleven patients who had the Rapid Progressive Periodontitis, were selected for this study. Subgingival microbiota was observed by Phase-Contrast microscope and the results were analyzed statistically. The results were as follows 1 In the first examination and 2 weeks after plaque control, the percentage of oocci in Adult Periodontitis were significantly higher than that in Rapid Progressive Periodontitis, but the percentage of the spirochetes and motile rods in Adult Periodontitis were lower than that in Rapid Progressive Periodontitis, but the percentage of the spirochetes and motile rods in Adult Periodontitis were lower than that in Rapid Progressive Periodontitis. 2. The interrelationships among cocci, motile rod and spirochetes were showed the tendency of reciprocal proportion, but that between motile rods and spirochetes were showed the tendency of proportion 3 . After plaque control, coca in the subgingival microbiota had tendency to increase, but motile rods and spirochetes had tendency to decrease. 4. The percentage of cocci in the_, both Adult Periodontitis and Rapid Progressive Penodontitis were the hightest and that of fusiforma were the lowest.
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