Association between self-reported bruxism and malocclusion in university students: A cross-sectional study

Kota Kataoka, Daisuke Ekuni, Shinsuke Mizutani, Takaaki Tomofuji, Tetsuji Azuma, Mayu Yamane, Yuya Kawabata, Yoshiaki Iwasaki, Manabu Morita

Research output: Contribution to journalArticle

13 Citations (Scopus)


Objectives: Bruxism can result in temporomandibular disorders, oral pain, and tooth wear. However, it is unclear whether bruxism affects malocclusion. The aim of this study was to examine the association between self-reported bruxism and malocclusion in university students. Methods: Students (n = 1503; 896 men and 607 women) aged 18 and 19 years were examined. Malocclusion was defined using a modified version of the Index of Orthodontic Treatment Need. The presence of buccal mucosa ridging, tooth wear, dental impression on the tongue, palatal/mandibular torus, and the number of teeth present were recorded, as well as body mass index (BMI). Additional information regarding gender, awareness of bruxism, orthodontic treatment, and oral habits was collected via questionnaire. Results: The proportion of students with malocclusion was 32% (n = 481). The awareness of clenching in males with malocclusion was significantly higher than in those with normal occlusion (chi square test, P < 0.01). According to logistic regression analysis, the probability of malocclusion was significantly associated with awareness of clenching (odds ratio [OR] 2.19; 95% confidence interval [CI], 1.22-3.93) and underweight (BMI <18.5 kg/m2) (OR 1.89; 95% CI, 1.31-2.71) in males but not in females. In subgroup analyses, the probability of crowding was also significantly associated with awareness of clenching and underweight (P < 0.01) in males. Conclusions: Awareness of clenching and underweight were related to malocclusion (crowding) in university male students.

Original languageEnglish
Pages (from-to)423-430
Number of pages8
JournalJournal of epidemiology
Issue number6
Publication statusPublished - Jan 1 2015



  • Bruxism
  • Cross-sectional studies
  • Malocclusion
  • Young adult

ASJC Scopus subject areas

  • Epidemiology

Cite this