Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan.
Department of Microbiology and Immunology, Columbia University Medical Center, 650 West 168 Street 141 Black Building, New York, NY 10032, USA.
Int J Environ Res Public Health. 2019 Feb 26;16(5):690. doi: 10.3390/ijerph16050690.
Bruxism is a parafunctional activity that can seriously affect quality of life. Although bruxism induces many problems in the oral and maxillofacial area, whether it contributes to the onset of malocclusion remains unclear. The purpose of this prospective cohort study was to investigate the association between the onset of malocclusion and awareness of clenching during the daytime in young adults. Among 1,092 Okayama University students who underwent normal occlusion at baseline, we analysed 238 who had undergone a dental examination and had complete data after 3 years (2013⁻2016). We also performed subgroup analysis to focus on the association between awake bruxism and the onset of crowding (n = 216). Odds ratios (ORs) were calculated using multivariate logistic regression analyses. The incidences of malocclusion and crowding were 53.8% and 44.5%, respectively. In multivariate logistic regression, awareness of clenching was a risk factor for crowding (OR: 3.63; 95% confidence interval [CI]: 1.08⁻12.17). Moreover, underweight (body mass index < 18.5 kg/m²) was related to the onset of malocclusion (OR: 2.34; 95%CI: 1.11⁻4.92) and crowding (OR: 2.52, 95%CI: 1.25⁻5.76). These results suggest that awareness of clenching during the daytime and underweight are risk factors for the onset of crowding in young adults.
磨牙症是一种口腔功能异常活动，可严重影响生活质量。虽然磨牙症会导致口腔和颌面部出现许多问题，但它是否会导致错颌的发生尚不清楚。本前瞻性队列研究的目的是探讨年轻人白天磨牙与错颌发生的相关性。在基线时咬合正常的 1092 名冈山大学学生中，我们分析了 238 名在 3 年后（2013-2016 年）接受过牙科检查且数据完整的学生。我们还进行了亚组分析，重点关注清醒磨牙症与拥挤的相关性（n=216）。使用多变量逻辑回归分析计算比值比（OR）。错颌和拥挤的发生率分别为 53.8%和 44.5%。在多变量逻辑回归中，白天磨牙意识是拥挤的危险因素（OR：3.63；95%置信区间[CI]：1.08-12.17）。此外，体重不足（体重指数<18.5kg/m²）与错颌（OR：2.34；95%CI：1.11-4.92）和拥挤（OR：2.52，95%CI：1.25-5.76）的发生有关。这些结果表明，白天磨牙意识和体重不足是年轻人拥挤发生的危险因素。
