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ID 116528
Title Alternative
Functional tooth number and mortality
Maekawa, Kenji Japan Prosthodontic Society|Okayama University
Ikeuchi, Tomoko Tokyo Metropolitan Institute of Gerontology
Shinkai, Shoji Tokyo Metropolitan Institute of Gerontology
Hirano, Hirohiko Tokyo Metropolitan Institute of Gerontology
Ryu, Masahiro Japan Prosthodontic Society|Tokyo Dental College
Tamaki, Katsushi Japan Prosthodontic Society|Kanagawa Dental University
Yatani, Hirofumi Japan Prosthodontic Society|Osaka University
Kuboki, Takuo Japan Prosthodontic Society|Okayama University
Kimura-Ono, Aya Japan Prosthodontic Society|Okayama University
Kikutani, Takeshi Japan Prosthodontic Society|The Nippon Dental University
Suganuma, Takashi Japan Prosthodontic Society|Showa University
Ayukawa, Yasunori Japan Prosthodontic Society|Kyushu University
Gonda, Tomoya Japan Prosthodontic Society|Osaka University
Ogawa, Toru Japan Prosthodontic Society|Tohoku University
Fujisawa, Masanori Japan Prosthodontic Society|Meikai University
Ishigaki, Shoichi Japan Prosthodontic Society|Osaka University
Watanabe, Yutaka Hokkaido University
Kitamura, Akihiko Tokyo Metropolitan Institute of Gerontology
Taniguchi, Yu National Institute for Environmental Studies
Fujiwara, Yoshinori Tokyo Metropolitan Institute of Gerontology
Edahiro, Ayako Tokyo Metropolitan Institute of Gerontology
Ohara, Yuki Tokyo Metropolitan Institute of Gerontology
Furuya, Junichi Tokyo Medical and Dental University
Nakajima, Junko Tokyo Dental College
Umeki, Kento Nihon University
Igarashi, Kentaro Nihon University
Horibe, Yasuhiro Tokyo Dental College
Kugimiya, Yoshihiro Tokyo Dental College
Kawai, Yasuhiko Nihon University
Matsumura, Hideo Nihon University
Ohkawa, Shuji Meikai University
functional teeth
present teeth
risk factor
Content Type
Journal Article
Aim: Previous studies on the association between intraoral conditions and mortality in community-dwelling older individuals reported that fewer present teeth (PT) are significant risk factors for mortality. However, how the number of PT relative to the number of functional teeth (FT), including both present and rehabilitated teeth, influences mortality has not been investigated fully. This study examined the impact of the number of FT on mortality among community-dwelling Japanese older adults.
Methods: This study was a retrospective, observational and population-based follow-up study, which examined 1188 older individuals who participated in an annual geriatric health examination from 2009 to 2015. The average follow-up period was 1697.0 ± 774.5 days. The primary outcome was all-cause mortality at follow-up. The numbers of PT and FT of each participant were counted during an oral examination. In addition, demographics, clinical variables, blood nutrient markers, physical functions and perceived masticatory function were measured.
Results: Kaplan–Meier analysis, followed by a log-rank test, revealed that fewer PT (P < 0.001) and FT (P = 0.002) were significantly associated with a reduced survival rate. Cox's proportional hazard analysis indicated that the number of FT, but not the number of PT, was a significant independent mortality risk factor after adjusting for demographics, clinical variables, nutrient markers and physical functioning (P = 0.036, hazard ratio: 2.089).
Conclusions: Current results suggest that the number of FT more strongly predicts all-cause mortality than the number of PT among community-dwelling older adults. Further studies are necessary to consider the confounding of socioeconomic status and disability status.
Journal Title
Geriatrics & Gerontology International
John Wiley & Sons|Japan Geriatrics Society
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This is an open access article under the terms of the Creative Commons Attribution License (, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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Oral Sciences