Prevalence and distribution of gingivitis, periodontitis and missing teeth in adolescents and adults according to GPM/T index

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Abstract
The purpose of the present study was to determine the distribution and the prevalence of periodontal disease in adolescents and adults using the WHO method TRS 621 and to propose a method of presenting the results by a simple index system. On the basis of a medium term longitudinal 5 yr project 1048 subjects were examined in age group 1 (15-19 yr) and 425 subjects in age group 2 (35-44 yr). Each subject had a full mouth examination for the presence of supra- or subgingival calculus, pocketing, bleeding and recession and the periodontal index (PI) (Russell). These epidemiologic data were characterized by the ratio gingivitis periodontitis missing (GPM) teeth by using solely the recordings for bleeding, pockets and missing teeth. The mean GPM index in Group 1 was 15.4:0.6:0.8. The mean GPM Index in Group 2 was 12.0:4.6:7.7. The PI is more subjective than the TRS 621 method. Full mouth recording is required for the suggested GPM/T index analogous to the DMFT [decayed, missing, filled teeth] index. This new scoring ratio makes it possible to present data of the progression rate of periodontal disease by the increment of tooth related P/T [teeth with periodontitis] and M/T [missing teeth]. Both indices with the common M-value (Missing) might be used for longitudinal programs of control and prevention of periodontal disease and dental caries.

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