Representativeness of the “Ramfjord teeth” for epidemiologic studies of gingivitis and periodontitis

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Abstract
Data from the Veterans Administration Dental Longitudinal Study of 736 men each examined four times were analyzed to determine how representative the six "Ramfjord Teeth" (RT) were of the rest of the dentition for epidemiologic studies of gingivitis and periodontitis. Correlation coefficients were calculated between scores for gingival inflammation generated by the RT and scores for the teeth in the rest of the mouth; the correlation coefficients between the two scores tended to be high. Sensitivity, specificity and predictive values were calculated for periodontal pathology classified on the basis of the pocket depths of the six RT. Reliance on the RT resulted in systematic underestimation of the prevalence and incidence of deep periodontal pockets. The RT are more than adequately representative of the rest of the dentition for epidemiologic studies of gingivitis, but are inadequate surrogates of the rest of the mouth for epidemiologic studies of peridonotitis.

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