Impact of periodontal preventive programmes on the data from epidemiologic studies

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Abstract
This report provides only circumstantial evidence for the impact of programmes on periodontal epidemiology. The prerequisites for programmes and campaigns are described, and epidemiologic data on periodontal disease are compared with known changes in factors that may be affected by such activities. Unfortunately, parameters for periodontal disease as a process are not available. Only variables indicating irreversible effects on the periodontal status can be obtained. A lack of appropriate studies creates additional problems. This review indicates that preventive programmes and campaigns to improve oral hygiene have affected periodontal epidemiologic data concerning gingivitis and mild/moderate periodontitis favourably. Severe periodontitis seems not to have been influenced by such activities. Smoking is strongly associated with the severity of periodontitis. Therefore, a positive effect may be anticipated following the smoking cessation campaigns currently introduced worldwide. However, because of the irreversible nature of our epidemiologic parameters, it will take decades before any effect may be evident. It is recommended that periodontal epidemiology should be revitalized by introducing a nominalistic categorization instead of the changing essentialistic approaches used so far in order to facilitate the interpretation of data.