• Clin Oral Investig · Apr 2019

    Risk factors for tooth loss in community-dwelling Japanese aged 40 years and older: the Yamagata (Takahata) study.

    • Shigeo Ishikawa, Tsuneo Konta, Shinji Susa, Kenichiro Kitabatake, Kenichi Ishizawa, Hitoshi Togashi, Atsushi Tsuya, Yoshiyuki Ueno, Isao Kubota, Hidetoshi Yamashita, Takamasa Kayama, and Mitsuyoshi Iino.
    • Department of Dentistry, Oral and Maxillofacial Plastic and Reconstructive Surgery, Faculty of Medicine, Yamagata University, 2-2-2 Iida-nishi, Yamagata, 990-9585, Japan. shigeo_ishikawa2011@yahoo.co.jp.
    • Clin Oral Investig. 2019 Apr 1; 23 (4): 1753-1760.

    ObjectivesThe aim of the present study was to investigate comprehensively the risk factors, including some lifestyle-associated factors, oral health habits, and socioeconomic status, for having less than 20 teeth in cross-sectional study in the general population of Japan.Materials And MethodsThe survey population was the general population of individuals aged greater than or equal to 40 years in Takahata town, Japan in 2005. A postal survey with a self-administered questionnaire was distributed, and 7542 participants were entered into the final statistical analysis. The self-administered questionnaire contained items regarding some lifestyle-associated factors, oral health, and dietary intake, including alcohol and sucrose consumption. To confirm the independent association between the number of teeth and several parameters, a multivariate logistic regression analysis was used to estimate the adjusted odds ratios (ORs) and 95% confidence intervals (95% CIs).ResultsA low educational status, no dental check-ups, low frequency of brushing, older age, and smoking habit were independent risk factors for less than 20 teeth. A low educational status was a particularly significant risk factor for less than 20 teeth (OR = 1.352, 95% CI = 1.125-1.624).ConclusionThese results emphasize the importance of good oral health habits, such as frequent tooth brushing, routine dental check-ups, and no smoking, and indicate that more appropriate and compulsory education regarding oral health is needed to lessen the education level-derived differences in oral health.Clinical RelevancePoor oral health habits and low educational status are the independent risk factors for having less than 20 teeth.

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