Department of Prosthodontics, Faculty of Medicine and Health Sciences, School of Dentistry, University of Barcelona, Barcelona, Catalonia, Spain.
Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain.
J Oral Rehabil. 2022 Apr;49(4):373-380. doi: 10.1111/joor.13308. Epub 2022 Feb 12.
The relationships between the frequency of masticatory side switches (MSS) and other aspects of masticatory function are not clear.
In this study, we determined the effect of MSS frequency on masticatory performance and rhythm in dentate adults and explored the between-subject relationships among side switch frequency, masticatory rhythm and laterality.
In this crossover study, subjects performed six masticatory patterns of five trials each, chewing bagged silicone for 20 cycles. The six patterns were freestyle, unilateral right, unilateral left, and switching sides one, three and five times. Masticatory performance and rhythm were determined for each style by median particle size (MPS) and chewing cycle duration, respectively. In the freestyle mastication pattern, masticatory laterality was assessed by the unilateral chewing index, and the frequency of MSS was assessed by the MSS Index. Data were analysed using Friedman's test and repeated measures analysis of variance.
We included 29 participants (15 women; median age, 23 years). No significant between-subjects differences in the MPS were detected obtained by switching one, three or five times per trial. Chewing cycle duration increased with the MSS number per trial. During freestyle mastication, the MSS Index was inversely correlated with the unilateral chewing index (Rho -0.569; 95% CI -0.25 to -0.78; p = .001; Spearman test), but not with the MPS or chewing cycle duration.
Differences in MSS frequency do not affect masticatory performance, but they do alter the masticatory rhythm. Individuals with a higher MSS frequency also have a more symmetrical chewing pattern.
咀嚼侧切换频率（MSS）与咀嚼功能其他方面之间的关系尚不清楚。
本研究旨在确定 MSS 频率对有牙成年人咀嚼性能和节律的影响，并探讨侧切换频率、咀嚼节律和偏侧性之间的个体间关系。
在这项交叉研究中，受试者进行了六个咀嚼模式的五次试验，每个模式咀嚼 20 个袋装硅树脂循环。六个模式分别为自由式、单侧右侧、单侧左侧和左右侧切换 1、3 和 5 次。分别采用中值粒径（MPS）和咀嚼周期持续时间来确定每种模式的咀嚼性能和节律。在自由式咀嚼模式中，通过单侧咀嚼指数评估咀嚼偏侧性，通过 MSS 指数评估 MSS 频率。采用 Friedman 检验和重复测量方差分析对数据进行分析。
共纳入 29 名受试者（15 名女性；中位年龄 23 岁）。在每次试验切换 1、3 或 5 次时，MPS 未检测到显著的组间差异。咀嚼周期持续时间随每次试验的 MSS 数量增加而增加。在自由式咀嚼时，MSS 指数与单侧咀嚼指数呈负相关（Rho -0.569；95%CI -0.25 至 -0.78；p=0.001；Spearman 检验），但与 MPS 或咀嚼周期持续时间无关。
MSS 频率的差异不会影响咀嚼性能，但会改变咀嚼节律。具有更高 MSS 频率的个体也具有更对称的咀嚼模式。
