PurposeTo investigate the prevalence of probable sleep bruxism (SB) in the primary and mixed dentitions using non-instrumental approach and evaluate whether sleep quality is associate with probable SB in different age ranges.MethodsSchool-based cross-sectional study with children aged 2–5 (primary dentition, n = 372) and 8–10 years old (mixed dentition, n = 563) enrolled in public schools at Florianopolis and their parents. The sleep characteristics, socioeconomic status, and presence of probable SB were assessed using questionnaires. Seven trained examiners (Kappa > 0.7) assessed tooth wear. Children were selected following a stratified sample (2–5); and a system of the proportionality, first the schools of the sanitary districts and after the classrooms (8–10). Unadjusted and adjusted Poisson regression was performed with probable SB as a dependent variable. Independent variables were as follows: family income, parent schooling, drooling, tooth wear, and sleep quality. The independent variables presenting p value ≤ 0.20 were included in the adjusted model.ResultsThe prevalence of probable SB was 22.3% in primary and 32.7% in mixed dentition. Probable SB was significantly associated with poor sleep quality (p < 0.001) in mixed dentition (PR 1.80; 95% CI 1.34–2.44) adjusting for age and drooling. In the primary dentition, the adjusted regression did not show association between analyzed characteristic and probable SB. Sex, socioeconomic, head of the household educational status, drooling, and tooth wear were not associated with probable SB in both dentitions.ConclusionPrevalence of probable SB is higher in mixed than in primary dentition and poor sleep quality is associated with probable SB in children aged 8–10 years.

中文翻译：

---

初级和混合牙列中睡眠质量差和可能的睡眠磨牙症患病率：横断面研究

目的使用非工具方法调查初级和混合牙列中可能的睡眠磨牙症（SB）的患病率，并评估睡眠质量是否与不同年龄段的可能的 SB 相关。方法 以 2-5 岁儿童为对象的基于学校的横断面研究（初级牙列，n = 372）和 8-10 岁（混合牙列，n = 563）和他们的父母就读于弗洛里亚诺波利斯的公立学校。使用问卷评估睡眠特征、社会经济状况和可能的 SB 的存在。七名训练有素的检查员（Kappa > 0.7）评估牙齿磨损。根据分层样本（2-5）选择儿童；和比例系统，首先是卫生区的学校，然后是教室（8-10）。使用可能的 SB 作为因变量进行未调整和调整的泊松回归。自变量如下：家庭收入、父母受教育程度、流口水、牙齿磨损和睡眠质量。p 值≤ 0.20 的自变量被包括在调整后的模型中。结果 可能 SB 的患病率在初级牙列中为 22.3%，在混合牙列中为 32.7%。可能的 SB 与混合牙列 (PR 1.80; 95% CI 1.34–2.44) 的睡眠质量差 (p < 0.001) 显着相关，调整年龄和流口水。在初级牙列中，调整后的回归没有显示分析的特征和可能的 SB 之间的关联。性别、社会经济、户主教育状况、流口水和牙齿磨损与两种牙列中可能的 SB 无关。