analysis of site specific periodontal bacteria sampling schemes.a great deal of controversy has existed in the periodontal literature as to whether the site or the subject should be the unit of analysis. using the site as the unit of analysis assumes that observations of sites within the same subject are independent and ignores between subject variation. the purpose of this report is to evaluate the influence that the unit of analysis has on estimating the number of necessary site specific bacterial samples from each subject. the number of bacterial samples ...19921625150
detection of identical ribotypes of porphyromonas gingivalis in patients residing in the united states, sudan, romania and norway.porphyromonas gingivalis has been isolated from periodontitis lesions in subjects from many geographical locations. the purpose of this investigation was to determine whether similar ribotypes of p. gingivalis could be detected among strains isolated in different countries. a total of 198 isolates of p. gingivalis were obtained from 52 periodontitis patients in boston (130 isolates), bergen, norway (17 isolates), khartoum, sudan (26 isolates), and bucharest, romania (25 isolates). dna was isolat ...19979227134
subgingival microbiota of chilean patients with chronic association between race/ethnicity and the composition of the subgingival microbiota has been found in chronic periodontitis. a study was undertaken to determine the characteristics of the subgingival microbiota of chronic periodontitis in chileans residing in santiago.200415212354
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