[Individual plaque flora determination in periodontal diseases. Methods and standardization].

The dental plaque of 15 patients with gingivitis and of 15 patients with marginal periodontitis was won by means of two different methods of isolation and sampling. Either the plaque was sampled by a scaler with and without covering the crown. The estimation of plaque-microflora was done by microscopical and cultural bacteriological methods. Differences in the composition of plaque-microflora could be found in dependence of method used in isolation and sampling. Also differences in bacterial colonisation of different regions were found using the same technique of sampling. The subgingival plaque in marginal periodontitis was different of the plaque in gingivitis. In plaque-microflora of periodontitis the percentage of gram-positive cocci and rods was decreasing, the percentage of gram-negative and mobile bacteria was increasing compared with the bacterial flora in gingivitis. In the subgingival plaque in gingivitis streptococci and actinomyces were the predominant bacteria.