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Background  Sports-related dental injuries, such as tooth fracture, loosening, and avulsion, are a major concern among young athletes because they directly impair oral function. Although the preventive efficacy of mouthguards has been well established, the prevalence of sports-related dental injuries remains high among young athletes. The aim of this study is to identify the variables contributing to the risk of sports-related dental injuries by conducting a survey on large population of young athletes in Miyagi prefecture.    Methods  A cross-sectional study was conducted with school-aged athletes (aged 6–15 years,  n  = 5735) using a self-reported questionnaire. The questionnaire examined general variables, including sex, age, and body mass index; sports-related variables, including sports-type, team level, activity schedule, break time, and verbal/physical abuse by coaches; and lifestyle variables related to free time, including screen-time and sleep duration. Their associations with sports-related dental injuries were examined using multivariate logistic regression models.    Results  The prevalence of sports-related dental injuries was 13.3% (763 of 5735 young athletes) and was higher in males (14.3%, 592 of 4132) than in females (10.7%, 171 of 1603; adjusted odds ratios [ORs] and 95% confidence intervals [CIs]: 1.48 [1.22–1.79],  p  < 0.001). After stratification according to sex, significant associations with the prevalence of sports-related dental injuries were evident for three variables—insufficient break time, verbal abuse, and physical punishment—in males (adjusted ORs [95% CI]: 1.35 [1.03–1.77],  p  = 0.032; 1.31 [1.05–1.62],  p  = 0.015; and 1.36 [1.06–1.75],  p  = 0.016, respectively) but not in females (adjusted ORs [95% CI]: 0.88 [0.53–1.47],  p  = 0.623; 1.29 [0.87–1.91],  p  = 0.206; and 0.97 [0.57–1.63],  p  = 0.894, respectively).    Conclusions  Although our results might be based on the individual athlete’s self-perception to the sports-related variables, our results suggest that insufficient break time, verbal abuse, and physical punishment from coaches are positively associated with the prevalence of sports-related dental injuries in young male athletes.

Factors associated with sports-related dental injuries among young athletes: a cross-sectional study in Miyagi prefecture