Division of Craniofacial Anomalies, Tohoku University Graduate School of Dentistry, Sendai, Japan.
Department of Orthodontics and Speech Therapy for Craniofacial Anomalies, Tohoku University Hospital, Sendai, Japan.
Clin Oral Investig. 2023 Dec 26;28(1):36. doi: 10.1007/s00784-023-05469-2.
Pain associated with orthodontic tooth movement reportedly reduces periodontal ligament tactile sensation. However, the mechanism associated with the central nervous system remains unclear. This study was conducted by measuring somatosensory evoked magnetic fields (SEFs) during mechanical stimulation of teeth as they were being moved by separator elastics. Findings clarified the effects of pain on periodontal ligament tactile sensation during orthodontic tooth movement.
Using magnetoencephalography, SEFs were measured during the application of mechanical stimuli to the mandibular right first molars of 23 right-handed healthy participants (0 h). Separator elastics were subsequently inserted into the mesial and distal interdental portions of the mandibular right first molars. The same mechanical stimuli were applied again 24 h later while the SEFs were measured (24 h). After each SEF measurements, pain was also evaluated using the Visual Analog Scale (VAS).
The VAS values were significantly higher at 24 h than at 0 h (p < 0.05). No significant difference in the peak latencies was found between those obtained at 0 h and 24 h, but the intensities around 40.0 ms in the contralateral hemisphere were significantly lower at 24 h than at 0 h (p < 0.01).
Pain associated with orthodontic tooth movement might suppress periodontal ligament tactile sensation in the primary somatosensory cortex.
Pain associated with orthodontic tooth movement might affect periodontal ligament sensation, consequently causing discomfort during occlusion.
据报道，正畸牙齿移动引起的疼痛会降低牙周韧带触觉。然而，与中枢神经系统相关的机制尚不清楚。本研究通过测量分离弹性体移动牙齿时牙齿机械刺激产生的体感诱发电场（SEFs）来进行。研究结果阐明了正畸牙齿移动过程中疼痛对牙周韧带触觉的影响。
使用脑磁图，在 23 名右利手健康参与者的右侧下颌第一磨牙（0 h）上施加机械刺激时测量 SEFs。随后，将分离弹性体插入下颌第一磨牙的近中和远中牙间部分。24 小时后再次施加相同的机械刺激，同时测量 SEFs（24 h）。每次 SEF 测量后，还使用视觉模拟量表（VAS）评估疼痛。
24 小时时的 VAS 值明显高于 0 小时时（p < 0.05）。在 0 小时和 24 小时获得的峰潜伏期之间未发现显著差异，但在对侧半球 40.0 ms 左右的强度在 24 小时时明显低于 0 小时时（p < 0.01）。
正畸牙齿移动引起的疼痛可能会抑制初级体感皮层中的牙周韧带触觉。
正畸牙齿移动引起的疼痛可能会影响牙周韧带的感觉，从而在咬合时引起不适。
