Universidade Federal do Rio de Janeiro, Departamento de Odontopediatria e Ortodontia, Programa de pós-graduação em Odontologia (UFRJ, Rio de Janeiro/RJ, Brazil).
Universidade Federal de Juiz de Fora, Departamento de Fisiologia do ICB, Programa de pós-graduação em Ciências da Reabilitação e Desempenho Físico Funcional (UFJF, Juiz de Fora/MG, Brazil).
Dental Press J Orthod. 2023 Apr 14;28(1):e232198. doi: 10.1590/2177-6709.28.1.e232198.oar. eCollection 2023.
The emergence of orthodontic aligners has provided an aesthetic and comfortable option for orthodontic treatment. However, the encapsulated design of the aligners can influence the masticatory muscles, and might compromise safe treatment.
This preliminary longitudinal study aimed to investigate whether the use of orthodontic aligners affects the biting force and myoelectric activity of the superficial masseter and anterior temporal muscles.
Ten subjects participated in the study and underwent treatment during an 8-month follow-up period. The root mean square (RMS), the median power frequency (MPF) of the surface electromyography (sEMG) signals, and the biting force (kgf) were recorded and normalized relative to the pretreatment condition. The data were analyzed by repeated-measure analysis of variance (ANOVA), with the significance level set at 5%.
Both the superficial masseter and the anterior temporal muscles presented an increase in sEMG signal activity during the treatment, with a marked increase in the latter compared to the former (p<0.05). Moreover, a significant decrease in bite force was evidenced (p<0.05).
This preliminary study observed that the orthodontic aligners affected the muscle recruitment pattern of masticatory muscles, and reduced biting performance during the 8-month follow-up period.
正畸矫治器的出现为正畸治疗提供了一种美观、舒适的选择。然而，矫治器的封装设计会影响咀嚼肌，并可能影响治疗的安全性。
本初步纵向研究旨在探讨正畸矫治器的使用是否会影响表面咀嚼肌和颞前肌的咬合力和肌电活动。
10 名受试者参与了研究，并在 8 个月的随访期间接受了治疗。记录表面肌电图（sEMG）信号的均方根（RMS）、中值功率频率（MPF）和咬合力（kgf），并相对于预处理条件进行归一化。使用重复测量方差分析（ANOVA）对数据进行分析，显著性水平设置为 5%。
在治疗过程中，浅层咀嚼肌和颞前肌的 sEMG 信号活性均增加，后者的增加明显高于前者（p<0.05）。此外，还证实了咬合力的显著下降（p<0.05）。
本初步研究观察到正畸矫治器影响咀嚼肌的肌肉募集模式，并在 8 个月的随访期间降低了咀嚼性能。
