Lung Cancer Risk in Male Dentists: A Retrospective Cohort Study in Japan, 1964-1997

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  • Nishio Nobuhiro
    Department of Hygiene, Kansai Medical University
  • Tanaka Hideo
    Department of Cancer Control and Statistics, Osaka Medical Center for Cancer and Cardiovascular Diseases
  • Tsukuma Hideaki
    Department of Cancer Control and Statistics, Osaka Medical Center for Cancer and Cardiovascular Diseases
  • Tokunaga Rikio
    Department of Hygiene, Kansai Medical University

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It is reported that dentists are exposed to heavy metals in their clinics. To assess the risk of developing lung cancer among male Japanese dentists, we conducted a retrospective cohort study of 3,314 members of Osaka Dental Association (Osakafu-Shikaishikai). During 1964-1997, 39 were diagnosed with lung cancer, which figure was obtained from the file of the Osaka Cancer Registry. The observed number of lung cancers was compared with the expected number calculated by multiplying the number of person-years at risk by the corresponding age- and calendar time-specific incidence rate from the Osaka Cancer Registry data. The male dentists had no significantly different risk than general population.(O/E=1.01, 95%CI=0.72-1.39). Contrary to expectation, these findings indicate that Japanese dentists had almost the same overall risk of developing lung cancer as the general population.<br>

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