Department of Nursing, Tohoku Fukushi University, 6-149-1 Kunimi-ga-oka, Aoba-ku, Sendai, Miyagi, 981-3201, Japan.
Department of Orthodontics and Speech Therapy for Craniofacial Anomalies, Tohoku University Hospital, 2-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan.
Sleep Med. 2022 Dec;100:71-78. doi: 10.1016/j.sleep.2022.07.018. Epub 2022 Aug 6.
Bruxism is defined as a repetitive masticatory muscle activity, characterized by clenching or grinding of the teeth and/or by bracing or thrusting of the mandible. Although the bruxism etiology can be bidirectionally described with sleep disorders, there are few studies available to understand the association of sleep duration with bruxism behavior in early childhood.
A dataset of children (n = 90,148) from the Japan Environment and Children's Study (JECS) - an ongoing nationwide, prospective birth cohort study - was used to investigate the prospective association of the infant's sleep duration with bruxism behavior, which were acquired using self-reported questionnaire. After multiple imputation of data, the association between sleep duration and bruxism behavior in early childhood was examined using a binomial logistic regression analysis. It was conducted with adjustments for several maternal (e.g., age at delivery and sleep duration) and child-related (e.g., sex and sleep position) variables.
The prevalence of bruxism behavior at the ages of two and four were 16.2% and 22.5%, respectively. Using the shortest sleep duration group's participants (≤13 h) as the reference, the odds ratio (95% confidence interval) for prevalence of bruxism behavior decreased with longer sleep duration at one month of age, but not at 36 months of age, after covariate adjustments. Furthermore, in comparison with the impacts between daytime and nighttime sleep, nighttime sleep with longer duration were dominantly associated with bruxism behavior.
The sleep duration in infant stage, especially during newborn stage was associated with the prevalence of bruxism behavior in children.
磨牙症是一种重复性咀嚼肌活动，其特征为咬牙或磨牙，以及下颌紧咬或前伸。尽管磨牙症的病因可以用睡眠障碍来双向描述，但目前可用的研究很少，无法了解儿童早期的睡眠时间与磨牙行为之间的关联。
本研究使用了来自日本环境与儿童研究（JECS）的儿童数据集（n=90148），这是一项正在进行的全国性前瞻性出生队列研究，用于调查婴儿睡眠时间与磨牙行为的前瞻性关联，这些数据是通过自我报告的问卷获得的。在对数据进行多次插补后，使用二项逻辑回归分析来检查儿童早期睡眠时间与磨牙行为之间的关联。该分析考虑了几个母体（例如，分娩年龄和睡眠时间）和儿童相关（例如，性别和睡眠姿势）变量的调整。
两岁和四岁时磨牙行为的患病率分别为 16.2%和 22.5%。使用最短睡眠时间组（≤13 小时）的参与者作为参考，调整协变量后，一个月时睡眠时间较长者（≥14 小时）的磨牙行为患病率的比值比（95%置信区间）降低，但 36 个月时的比值比没有降低。此外，与日间和夜间睡眠的影响相比，夜间睡眠时间较长与磨牙行为的相关性更为显著。
婴儿期，特别是新生儿期的睡眠时间与儿童磨牙行为的患病率有关。
