Telich-Tarriba Jose E, Contreras-Molinar Crisol, Orihuela-Rodriguez Alejandro, Lesta-Compagnucci Lucas, Carrillo-Cordova Jorge R, Cardenas-Mejia Alexander
Plastic and Reconstructive Surgery Division, Hospital General "Dr Manuel Gea Gonzalez", Postgraduate Division of the Medical School, Universidad Nacional Autonoma de Mexico , Mexico City , Mexico.
Stomatology and Orthodontics Division, Hospital General "Dr Manuel Gea Gonzalez", Postgraduate Division of the School of Odontology, Universidad Nacional Autonoma de Mexico , Mexico City , Mexico.
J Plast Surg Hand Surg. 2019 Oct;53(5):316-319. doi: 10.1080/2000656X.2019.1626737. Epub 2019 Jun 12.
Hemifacial microsomia (HFM) is a malformation characterized by asymmetric facial growth with mandibular and muscular involvement. There are no reports focused on the functional status of the masticatory system of patients with HFM. The objective of this work evaluate bite force and electrical activity of masseter muscle in children with HFM, and compare them to healthy controls. A cross-sectional study was performed to compare bite force and electrical activity of masseter muscle between subjects with HFM and healthy children. Mean bite force (MBF) and surface electromyography (EMG) on maximum intercuspation (MIC) and rest position (RP) from both sides of the face were recorded. Comparative statistics between HFM patients and controls were performed using the Mann-Whitney test, Wilcoxon's signed rank test was used to compare the microsomic and healthy hemifaces. Twenty children with HFM and 10 controls were included, average age was 7.2 years (range 3-14). MBF did not show statistical significance between both groups. Surface EMG signal at MIC was significantly diminished when compared to the healthy side ( = .003) and to the control group ( = .016), this significance was also present at RP when comparing the affected and non-affected sides of the face ( < .01) but not against the controls ( = .08). This study showed that patients with HFM had diminished EMG values of the masseter muscle on the affected side, compared to healthy individuals, but bite force did not show significant alterations.
半侧颜面短小畸形（HFM）是一种以面部不对称生长并累及下颌骨和肌肉为特征的畸形。目前尚无关于HFM患者咀嚼系统功能状态的报道。本研究的目的是评估HFM患儿的咬合力和咬肌的电活动，并将其与健康对照组进行比较。进行了一项横断面研究，以比较HFM患者与健康儿童之间咬肌的咬合力和电活动。记录了面部两侧在最大牙尖交错位（MIC）和休息位（RP）时的平均咬合力（MBF）和表面肌电图（EMG）。使用Mann-Whitney检验对HFM患者和对照组进行比较统计，使用Wilcoxon符号秩检验比较患侧和健侧的咬合力和电活动。纳入了20名HFM患儿和10名对照组儿童，平均年龄为7.2岁（范围3 - 14岁）。两组之间的MBF没有统计学意义。与健康侧相比（P = 0.003）以及与对照组相比（P = 0.016），MIC时的表面EMG信号显著减弱；当比较面部患侧和未患侧时，RP时也存在这种显著性差异（P < 0.01），但与对照组比较时无显著性差异（P = 0.08）。本研究表明，与健康个体相比，HFM患者患侧咬肌的EMG值降低，但咬合力未显示出显著变化。
