[Bacteriological characterization of gingivitis-inducing plaque depending on different sugar levels of the diet].

In a time period of 21 days an experimental gingivitis was induced in 8 volunteers. Four volunteers received a carbohydrate-reduced, the other 4 persons a carbohydrate-enriched diet. Clinical investigations on the development of plaque and gingivitis and bacteriological examinations of the supragingival microflora were performed simultaneously.

[Bacteriological examination of subgingival flora in patients with marginal periodontitis].

Before and 4 weeks after a single course of local treatment, the composition of subgingival microflora of 15 patients with marginal periodontitis was determined by cultural and microscopical examination. A significant reduction in the number of gram-negative microorganisms could be achieved by this treatment. Anaerobic sporeless rods like Bacteroides and Fusobacteria but also Spirochetes, Eikenella and Capnocytophaga were involved in the inflammation.