伴下颌后缩的骨性II类错𬌗青少年的咀嚼肌活动与下颌边缘运动评估
Assessment of masticatory muscle activity and mandibular border movement in skeletal class II malocclusion adolescents with mandibular retrognathia.
文献信息
| PMID | 42983412 |
|---|---|
| 原文 | 在 PubMed 查看原文 ↗ |
| 发表日期 | 2026 |
| 作者 | Li-Yu Hou |
| 作者单位 | Department of Stomatology, Shenzhen People's Hospital, The Second Clinical Medical College, Jinan University, The First Affiliated Hospital, Southern University of Science and Technology, Shenzhen, 518020, China. |
| 期刊 | BMC oral health |
| SCI 分区 | Q1 |
| IF | 4 |
| 研究类型 | 临床研究 · 临床 |
| 所属专科 | 鼻科 |
中文摘要
目的： 探讨伴下颌后缩的骨性II类错𬌗青少年的咀嚼肌活动与下颌边缘运动，并探究下颌后缩对咀嚼系统功能的影响。
方法： 30名年龄10-15岁、诊断为骨性II类错𬌗伴下颌后缩的青少年组成骨性II类错𬌗组（C2G），30名骨性I类错𬌗青少年组成对照组（CG）。对两组进行咀嚼系统功能评估，包括在静息、紧咬、咀嚼、吞咽及边缘运动期间的Bio-EMG和JT-3D测量。全面测量并比较两组的肌电（EMG）活动和下颌运动学。
结果： （1）EMG：静息时，C2G与CG之间肌肉EMG振幅无显著差异。然而，紧咬时，C2G的颞肌前束和咬肌EMG振幅低于CG。同样，咀嚼时C2G的颞肌和咬肌EMG振幅较低。此外，吞咽时C2G的颞肌前束和双侧咬肌平均EMG值较低，而颏肌表现出更高的EMG活动。（2）下颌运动：与CG相比，C2G在下颌静息位时表现出增加的垂直和冠状位移。然而，咀嚼时C2G与CG之间未观察到下颌位移的显著差异。相反，吞咽时C2G表现出更大的垂直和冠状下颌位移，尤其是更明显的前向矢状位移。值得注意的是，两组在最大张口时的三维下颌位移无显著差异。
结论： 伴下颌后缩的骨性II类错𬌗青少年与I类对照者在多种功能运动中的咀嚼肌EMG活动和三维下颌运动学方面存在显著差异。伴下颌后缩的II类错𬌗青少年表现出颞肌、咬肌和颏肌激活模式的改变，以及静息和吞咽时下颌位移的改变。这些发现提示与下颌后缩相关的矢状骨性不调可能与口颌系统功能变化相关。
英文摘要
OBJECTIVE: To investigate masticatory muscle activity and mandibular border movement in adolescents with skeletal class II malocclusion and mandibular retrognathia and explore the influence of mandibular retrognathia on masticatory system function.
METHODS: Thirty adolescents aged 10-15 years diagnosed with skeletal class II malocclusion and mandibular retrognathia comprised the skeletal class II malocclusion group(C2G), while 30 adolescents with skeletal class I malocclusion constituted the control group(CG). Functional assessments of the masticatory system were performed in both cohorts, encompassing Bio-EMG and JT-3D measurements during rest, clenching, chewing, swallowing, and border movements. Electromyographic (EMG) activity and mandibular kinematics were comprehensively measured and compared between the two groups.
RESULTS: (1) EMG: During rest, there was no significant difference in the EMG amplitude of the muscles between the C2G and CG. However, during clenching, the EMG amplitude of the anterior temporalis and masseter muscles was lower in the C2G compared to the CG. Similarly, the EMG amplitude of the temporalis and masseter muscles during chewing was lower in the C2G. Furthermore, the mean EMG values of the anterior temporalis and both masseter muscles during swallowing were lower in the C2G, while the mentalis muscle exhibited higher EMG activity. (2) Mandibular movement: The C2G demonstrated increased vertical and coronal displacements in the mandibular resting position compared to the CG. However, during chewing, no significant disparity in mandibular displacement was observed between the C2G and CG. In contrast, during swallowing, the C2G exhibited greater vertical and coronal mandibular displacements, particularly with more pronounced forward sagittal displacement. Notably, there was no significant distinction in the three-dimensional mandibular displacement during maximum mouth opening between the two groups.
CONCLUSION: Significant differences in masticatory muscle EMG activity and 3D mandibular kinematics across multiple functional movements were found between skeletal class II mandibular retrognathia adolescents and class I controls. The class II mandibular retrognathia adolescents displayed modified temporalis, masseter and mentalis activation, alongside altered mandibular displacement at rest and during swallowing. These findings imply sagittal skeletal discrepancy linked to mandibular retrusion may correlate with stomatognathic functional changes.