Tooth loss and metabolic syndrome in middle-aged Japanese adults.

AIM: Metabolic syndrome is associated with periodontal disease and dental caries; however, little attention has been given to the association between metabolic syndrome and tooth loss, which is the endpoint of these two diseases. This study examined this association in middle-aged adults over a 5-year period. METHODS: A retrospective study was performed in 2107 participants (1718 males and 389 females) aged 35-60 years who underwent annual dental check-ups, to evaluate tooth loss and metabolic components, including obesity, elevated triglycerides, blood pressure, fasting glucose, and reduced high-density lipoprotein. Logistic regression analysis was performed to evaluate the association between metabolic syndrome (>/=3 components) at the baseline examination and tooth loss. RESULTS: Over a 5-year period, 10.8% of the participants lost at least one tooth. Compared to those with no metabolic components, participants with >/=3 components had an increased risk of tooth loss (odds ratio = 1.54; 95% confidence interval: 1.01-2.37), adjusting for age, gender, dental caries experience, attachment loss, oral hygiene status, number of teeth, tooth brushing frequency, smoking, and occupational status. CONCLUSIONS: Metabolic syndrome was associated with the incidence of tooth loss among middle-aged adults.