Public Library of ScienceActa Medica Okayama1932-62031572020Relationship between oral hygiene knowledge, source of oral hygiene knowledge and oral hygiene behavior in Japanese university students: A prospective cohort studye0236259ENDaikiFukuharaDepartment of Preventive Dentistry, Okayama University HospitalDaisukeEkuniDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesKotaKataokaDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesAyanoTaniguchi-TabataDepartment of Preventive Dentistry, Okayama University HospitalYokoUchida-FukuharaDepartment of Preventive Dentistry, Okayama University HospitalNaoki ToyamaDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesToshikiYonedaDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesYoshioSugiuraDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesMonirulIslamDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesHikariSahoDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesYoshiakiIwasakiHealth Service Center, Okayama UniversityManabuMoritaDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesThe aim of this prospective cohort study was to examine whether oral hygiene knowledge, and the source of that knowledge, affect oral hygiene behavior in university students in Japan. An oral exam and questionnaire survey developed to evaluate oral hygiene knowledge, the source of that knowledge, and oral hygiene behavior, such as the frequency of tooth brushing and regular dental checkups and the use of dental floss, was conducted on university student volunteers. In total, 310 students with poor tooth brushing behavior (frequency of tooth brushing per day [<= once]), 1,963 who did not use dental floss, and 1,882 who did not receive regular dental checkup during the past year were selected. Among these students, 50, 364, and 343 in each respective category were analyzed in over the 3-year study period (follow-up rates: 16.1%, 18.5%, and 18.2%, respectively). The odds ratios (ORs) and 95% confidence intervals (CIs) for oral hygiene behavior were calculated based on oral hygiene knowledge and the source of that knowledge using logistic regression models. The results showed that dental clinics were the most common (> 50%) source of oral hygiene knowledge, and that a more frequent use of dental floss was significantly associated with dental clinics being a source of oral hygiene knowledge (OR, 4.11; 95%CI, 1.871-9.029; p < 0.001). In addition, a significant association was seen between dental clinics being a source of oral hygiene knowledge and more frequent regular dental checkups (OR, 13.626; 95%CI, 5.971-31.095; p < 0.001). These findings suggest the existence of a relationship between dental clinics being the most common source of oral hygiene knowledge and improved oral hygiene behavior in Japanese university students.No potential conflict of interest relevant to this article was reported.MDPIActa Medica Okayama1660-46011792020Association between Sleep Quality and Duration and Periodontal Disease among University Students: A Cross-Sectional StudyENMd MonirulIslamDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesDaisukeEkuniDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesNaoki ToyamaDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesAyanoTaniguchi-TabataDepartment of Preventive Dentistry, Okayama University HospitalKotaKataokaDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesYokoUchida-FukuharaDepartment of Preventive Dentistry, Okayama University HospitalDaikiFukuharaDepartment of Preventive Dentistry, Okayama University HospitalHikariSahoDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesNanamiSawadaDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesYukihoNakashimaDepartment of Preventive Dentistry, Okayama University HospitalYoshiakiIwasakiHealth Service Center, Okayama UniversityManabuMoritaDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesThe purpose of this cross-sectional study was to investigate the association between sleep quality and duration, and periodontal disease among a group of young Japanese university students. First-year students (n = 1934) at Okayama University who voluntarily underwent oral health examinations were included in the analysis. Sleep quality and duration were assessed by the Japanese version of the Pittsburgh Sleep Quality Index. Dentists examined Oral Hygiene Index-Simplified (OHI-S), probing pocket depth (PPD), and percentage of sites with bleeding on probing (BOP). Periodontal disease was defined as presence of PPD >= 4 mm and BOP >= 30%. Overall, 283 (14.6%) students had periodontal disease. Poor sleep quality was observed among 372 (19.2%) students. Mean (+/- standard deviation) sleep duration was 7.1 +/- 1.1 (hours/night). In the logistic regression analysis, periodontal disease was significantly associated with OHI-S (odds ratio [OR]: 2.30, 95% confident interval [CI]: 1.83-2.90; p < 0.001), but not sleep quality (OR: 1.09, 95% CI: 0.79-1.53; p = 0.577) or sleep duration (OR: 0.98, CI: 0.87-1.10; p = 0.717). In conclusion, sleep quality and duration were not associated with periodontal disease among this group of young Japanese university students.No potential conflict of interest relevant to this article was reported.MDPIActa Medica Okayama1661-782716192019Influence of Occupational Stress and Coping Style on Periodontitis Among Japanese Workers: A Cross-Sectional Study 3540ENMd Monirul IslamDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesDaisukeEkuniOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesToshikiYonedaDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesAyaYokoiDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesManabuMoritaDepartment of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences The aim of this cross-sectional study was to evaluate the association between the influence of occupational stress and coping style on periodontitis among Japanese workers. The study sample included 738 workers (age range: 19-65 years) at a manufacturing company in Kagawa Prefecture, Japan. To analyze occupational stress and coping style, all participants answered a self-report questionnaire composed of items on their work environment and oral health behavior. Oral examinations were performed by calibrated dentists. Among all workers, 492 (66.7%) workers were diagnosed with periodontitis, and 50 (6.8%) were diagnosed with a high stress-low coping condition. Significant differences (p < 0.05) were observed between the periodontitis and non-periodontitis groups in terms of age, gender, body mass index, smoking status, daily alcohol drinking, monthly overtime work, worker type, and stress-coping style. Logistic regression analysis showed that a high stress-low coping condition was associated with an increased risk of periodontitis (odds ratio: 2.79, 95% confidence interval: 1.05-7.43, p = 0.039). These findings suggest that a high stress-low coping condition is associated with periodontitis among the 19-65 years of age group of Japanese workers.No potential conflict of interest relevant to this article was reported.