start-ver=1.4 cd-journal=joma no-vol=20 cd-vols= no-issue=6 article-no= start-page=607 end-page=614 dt-received= dt-revised= dt-accepted= dt-pub-year=2020 dt-pub=20200614 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Number of functional teeth more strongly predicts all‐cause mortality than number of present teeth in Japanese older adults en-subtitle= kn-subtitle= en-abstract= kn-abstract=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. 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kn-affil= affil-num=19 en-affil=Tokyo Metropolitan Institute of Gerontology kn-affil= affil-num=20 en-affil=National Institute for Environmental Studies kn-affil= affil-num=21 en-affil=Tokyo Metropolitan Institute of Gerontology kn-affil= affil-num=22 en-affil=Tokyo Metropolitan Institute of Gerontology kn-affil= affil-num=23 en-affil=Tokyo Metropolitan Institute of Gerontology kn-affil= affil-num=24 en-affil=Tokyo Medical and Dental University kn-affil= affil-num=25 en-affil=Tokyo Dental College kn-affil= affil-num=26 en-affil=Nihon University School of Dentistry at Matsudo kn-affil= affil-num=27 en-affil=Nihon University School of Dentistry at Matsudo kn-affil= affil-num=28 en-affil=Tokyo Dental College kn-affil= affil-num=29 en-affil=Tokyo Dental College kn-affil= affil-num=30 en-affil=Nihon University School of Dentistry at Matsudo kn-affil= affil-num=31 en-affil=Nihon University School of Dentistry kn-affil= affil-num=32 en-affil=Tokushima University Graduate School, Institute of Biomedical Sciences kn-affil= affil-num=33 en-affil=Meikai University School of Dentistry kn-affil= en-keyword=functional teeth kn-keyword=functional teeth en-keyword=mortality kn-keyword=mortality en-keyword=present teeth kn-keyword=present teeth en-keyword=risk factor kn-keyword=risk factor END