Interdisciplinary Scientific Group of Sports Medicine, Department of Sports Medicine, Faculty of Health Sciences, Medical University of Lublin, 20-093 Lublin, Poland.
Department of Sports Medicine, Faculty of Health Sciences, Medical University of Lublin, 20-093 Lublin, Poland.
Arch Oral Biol. 2024 Nov;167:106049. doi: 10.1016/j.archoralbio.2024.106049. Epub 2024 Jul 11.
The aim of the study was to determine how the electrical activity of the temporalis, masseter and sternocleidomastoid muscles differs in children with reduced transverse jaw dimension compared to children with normal occlusion.
It was a experimental study. Thirty-seven patients were included in the study. 18 in the study group received orthodontic treatment with removable appliances and 19 subjects were classified as normal occlusion subjects in the control group. A panoramic X-ray and digital intraoral scan were taken, followed by an surface electromyography of three muscle pairs (temporalis muscles, masseter muscles, sternocleidomastoid muscles) in resting position, while clenching and clenching on cotton rollers.
There was significantly greater activity in the experimental group than in the control group comparing muscles: temporalis muscles and masseter muscles in the resting position. Additionally, significantly greater activity of muscles in the control group was found during clenching. However, the asymmetry index of muscles indicates that there is significantly greater asymmetry of muscles activity in the experimental group. Compared to children with normal occlusion, children with a narrowed transverse dimension of the jaw have statistically significant differences in the bioelectrical activity of the temporalis, masseter and sternocleidomastoid muscles, as well as greater asymmetry in the bioelectrical voltage of the masseter muscles.
Patients with reduced transverse dimension of the jaw are characterized by increased resting activity of the masticatory muscles and reduced functional activity of the masticatory muscles. These patients have increased asymmetry in the bioelectrical tension of the masticatory muscles.
本研究旨在比较横向颌骨尺寸减小的儿童与正常牙合儿童的颞肌、咬肌和胸锁乳突肌的电活动有何不同。
这是一项实验研究。共纳入 37 例患者，其中 18 例研究组接受可摘矫治器正畸治疗，19 例对照组为正常牙合受试者。拍摄全景 X 线片和数字化口内扫描，然后在休息位、咬牙棉卷时对三组肌肉（颞肌、咬肌、胸锁乳突肌）进行表面肌电图检查。
在休息位时，实验组的肌肉（颞肌和咬肌）活动明显大于对照组。此外，在对照组中，肌肉在咬牙时的活动明显增加。然而，肌肉的不对称指数表明，实验组的肌肉活动不对称性显著更大。与正常牙合儿童相比，颌骨横向尺寸缩小的儿童在颞肌、咬肌和胸锁乳突肌的生物电活动方面存在统计学差异，并且咬肌的生物电电压不对称性更大。
横向颌骨尺寸减小的患者表现为咀嚼肌静息活动增加和咀嚼肌功能活动减少。这些患者的咀嚼肌生物电张力不对称性增加。
