Current status and factors of periodontal disease among Japanese high school students: a cross-sectional study

INTRODUCTION: This study aimed to investigate the prevalence of periodontal disease and the factors of the disease among high school students. METHOD: The participants were all students aged 15–18 years (n = 1202) at a high school in Japan. The data on oral health perceptions and behaviours were collected by a questionnaire survey. The prevalence of periodontal disease among them was investigated with the partial community periodontal index (PCPI). A logistic regression analysis was used to identify the factors associated with the PCPI. RESULTS: A total of 1069 students (88.9%) participated in this study. The prevalence of gingival bleeding, calculus, pocket depth of 4–5 mm, and pocket depth of 6 mm or more were 44.2%, 42.2%, 11.4%, and 1.6%, respectively. Approximately one-third of the students had a fear of dental treatment, and only 28.4% used dental floss. The results of logistic regression analysis, adjusted for sex and school year, showed that not visiting dentists regularly, not using dental floss, brushing teeth for less than 5 min, fear of dental treatment, and drinking sports drinks frequently were positively associated with periodontal conditions. CONCLUSION: This study identified a high prevalence of periodontal disease among Japanese high school students aged 15–18 years and its risk factors, such as poor oral health behaviours and fear of dental treatment.