Interdental cleaning and periodontal status among older Koreans: Findings from KNHANES VII

Objective To assess the association between the usage of interdental cleaning and periodontal status among older people in Korea. Background In order to maintain oral health in older people, it is very important to use interdental cleaning devices. However, there is a lack of research on periodontal status and interdental cleaning device use in older people. Methods This study used data collected from the 7th National Health Nutrition Survey (KNHANES VII: 2016–2018). A total of 3426 older people adults aged 65 years or older were selected from 16 489 participants. Data on sociodemographic status (sex, age, level of education, income, residential area), personal health practice (subjective health status, smoking, physical activity, hypertension, and diabetes mellitus), oral health practice (subjective oral health status, tooth brushing frequency, dental visits, and chewing problem), the number of teeth and periodontitis were collected. Periodontitis was defined as having a World Health Organisation community periodontal index (CPI) code greater than or equal to three, and severe periodontitis was defined as a CPI code 4. Participants having a CPI code of 3 or 4 were considered to have periodontal disease in this study. Logistic regression analysis investigated the association between interdental cleaning devices usage and periodontitis controlling the confounding factors. Results Those who do not use dental floss had a higher rate of periodontal disease (AOR = 1.47, 95% confidence interval CI: 1.05 to 2.1). However, there were no significant differences by interdental brush use. In those with 20 or more teeth, non‐users of dental floss had a higher risk of periodontitis in all models. Conversely, in those with fewer than 20 teeth, no significant differences were observed. Conclusions Older people with mostly intact dentitions have better periodontal health if they clean between their teeth.