Assessing root caries in populations: the evolution of the root caries index.

This paper traces the history of the epidemiologic assessment of root caries over the past 30 years. This history clearly points out that a critical junction has been reached between the state-of-the art for the reporting of root caries and the demand placed on research and service components of the oral health system. If progress is to be made, it is imperative that a uniform reporting method for root caries be adopted. This paper introduces the Root Caries Index (RCI) as an index that should prove to be a feasible and utilitarian method for reporting root caries data in descriptive and analytic epidemiologic studies as well as assessing the results of preventive and treatment agents, clinical trials. The Root Caries Index represents, in the evolution of a root caries measurement method, a refinement of the delineation of the true intraoral "population at risk" to the disease process. The resulting index is a true attack rate for supragingival root caries lesions. This development should permit more meaningful comparison of populations, clearer interpretations regarding risk factors, and more precise assessment of preventive and treatment agents.