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To assess the periodontal conditions of two randomly selected Swiss cohorts 25 years apart. Standardized examinations were performed to assess the periodontal conditions of two randomly selected populations of the Canton of Bern; oral cleanliness was evaluated using the plaque index (PlI) and the retention index (RI). Gingival health was scored according to the gingival index (GI). Periodontal conditions were evaluated by pocket probing depth (PPD) and loss of attachment (LA). At the first examination in 1985, 206 out of 350 subjects we
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