Abstract

Periodontal disease is defined as inflammation that is caused by bacteria in dental plaque. This disease is liable to be a factor contributing to the high leukocyte count over an extended period. Furthermore, a number of prospective epidemiologic studies have shown that the leukocyte count is a good predictor of ischemic heart disease (IHD). However there have been few epidemiological studies of the relationship between periodontal disease and the leukocyte count. The purpose of this study was to investigate the relationship between the total and differential leukocyte counts and oral conditions of Japanese factory workers who were classified according to their smoking habits. The 1,167 subjects were male factory workers employed with a chemical factory in Osaka, Japan. The oral conditions recorded were periodontal status (Community Periodontal Index of Treatment Needs, CPITN). The relationship between the total and differential leukocyte counts and the CPITN score of subjects who were classified according to their smoking habits was investigated in 1996 and 1997. In both the current smokers and nonsmokers, the subjects with severe periodontal disease, in contrast to the normal subjects, exhibited total leukocyte, neutrophil and monocyte counts that were significantly high for 1 year during follow-up studies. The periodontal disease is shown that causes the total leukocyte and neutrophil counts related to the development of IHD to remain at a high level.

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