Venkatraman Anumitha, Kaval Farah, Takiar Vinita
Speech Language Pathologist and Clinical Fellow, Voice and Swallowing Center, Department of Otolaryngology - Head and Neck Surgery, University of Cincinnati College of Medicine, Cincinnati, OH.
Speech Language Pathologist, Voice and Swallowing Center, Department of Otolaryngology - Head and Neck Surgery, University of Cincinnati College of Medicine, Cincinnati, OH.
J Oral Maxillofac Surg. 2020 Nov;78(11):1926-1932. doi: 10.1016/j.joms.2020.06.018. Epub 2020 Jun 15.
Although a standard cutoff value of less than 35 mm in the maximum mouth opening (MMO) has been used to diagnose trismus, this value does not account for natural demographic variations. The present cross-sectional study investigated the effects of age, weight, height, body mass index (BMI), and gender on the MMO in a healthy, heterogeneous population.
A volunteer sample from multiple sites in Cincinnati, Ohio, without any reported head and neck pathologies or current dental prostheses and with intact natural incisors were included. The main outcome measure was the average MMO. Key demographic information was collected from each participant. Multivariate regression analysis was completed on the factors of age, gender, weight, and height. One-way analysis of variance was completed for binned categories of BMI.
Data from 330 participants (age range, 18 to 86 years; mean, 42.13 ± 18.53 years; 171 men, 159 women) were collected. The range of MMO was 31 to 71 mm. Age, height, and weight were significant predictors of the MMO, and the final model accounted for ∼20% of the variation in the MMO [adjusted r, 0.208; F(3,326) = 29.731; P = .001]. On average, individuals with a greater BMI had a greater MMO (BMI, ≤25 kg/m, 50.57 ± 7.16 mm; BMI >25 but ≤30 kg/m, 51.58 ± 7.13 mm; BMI >30 kg/m, 53.53 ± 9.84 mm).
In a heterogeneous population of healthy adults, natural variations in age, height, and weight significantly affected the MMO.
尽管最大开口度（MMO）小于35毫米的标准临界值已被用于诊断牙关紧闭，但该值并未考虑自然的人口统计学差异。本横断面研究调查了年龄、体重、身高、体重指数（BMI）和性别对健康、异质人群MMO的影响。
纳入来自俄亥俄州辛辛那提多个地点的志愿者样本，这些志愿者无任何头颈部疾病报告或当前假牙，且天然切牙完整。主要结局指标是平均MMO。收集每位参与者的关键人口统计学信息。对年龄、性别、体重和身高因素进行多变量回归分析。对BMI的分组类别进行单因素方差分析。
收集了330名参与者的数据（年龄范围18至86岁；平均年龄42.13±18.53岁；男性171名，女性159名）。MMO范围为31至71毫米。年龄、身高和体重是MMO的显著预测因素，最终模型解释了MMO约20%的变异[调整后r，0.208；F(3,326)=29.731；P = 0.001]。平均而言，BMI较高的个体MMO较大（BMI≤25kg/m，50.57±7.16毫米；BMI>25但≤30kg/m，51.58±7.13毫米；BMI>30kg/m，53.53±9.84毫米）。
在健康成年人的异质人群中，年龄、身高和体重的自然变异显著影响MMO。
