Abstract
The distribution of gingivitis among 854 subjects was shown to be satisfactorily described by a catalytic type of equation ( K − y = KB x ) similar to that used by Knutson to assess the dental caries prevalence (DMF) among children. The proportion of an age group with one or more Russell scores for gingivitis denoted by 2 was related to the Russell Periodontal Index and this relationship enables a simplified procedure to be employed in surveys. A linear regression was found which described the relation between periodontal index ( x) and the proportion of a group with one or more periodontal pockets (Russell score 6 or 8). An equation x = 0.8 + 0.02 y was derived from the data from Melbourne which differed from data for Chinese in Taiwan. This difference is discussed in relation to the aetiology of periodontal disease. These simplified methods may be useful in rapidly making surveys of large population groups for gingivitis and periodontitis.
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