Somatosensory evoked magnetic fields of periodontal mechanoreceptors
Somatosensory evoked magnetic fields of periodontal mechanoreceptors
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DOI：
10.1016/j.heliyon.2020.e03244
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发表时间：
2020-01-01
期刊：
影响因子：
4
通讯作者：
Sasaki, Keiichi
中科院分区：
文献类型：
--
作者：
Hihara, Hiroki;Kanetaka, Hiroyasu;Sasaki, Keiichi
为了评估牙周机械感受器的刺激在初级体感皮层的反应的本地化，体感诱发场（SEFs）的刺激左下颌尖牙和第一磨牙使用脑磁图在25名健康受试者进行了测量。触觉刺激采用手工制作的刺激装置，记录接触牙齿的瞬间触发，分别在20名和19名受试者中检测到尖牙和第一磨牙的SEFs。两种反应都在双侧半球检测到。犬的同侧半球潜伏期为62.1 +/- 12.9 ms，对侧半球为65.9 +/- 14.8 ms。第一磨牙的潜伏期在同侧半球为47.4 +/- 6.6 ms，在对侧半球为47.8 +/- 9.1 ms。第一磨牙的潜伏期明显短于犬。在中央沟中估计等效电流偶极子，并与正中神经SEF的位置相比，将等效电流偶极子定位在前侧。尖牙和第一磨牙的三维坐标无显著差异。这些发现证明了牙齿在初级躯体感觉皮层的口面代表区内的精确位置。
To evaluate the localization of responses to stimulation of the periodontal mechanoreceptors in the primary somatosensory cortex, somatosensory evoked fields (SEFs) were measured for stimulation of the left mandibular canine and first molar using magnetoencephalography in 25 healthy subjects. Tactile stimulation used a handmade stimulus device which recorded the trigger at the moment of touching the teeth.SEFs for the canine and first molar were detected in 20 and 19 subjects, respectively. Both responses were detected in the bilateral hemispheres. The latency for the canine was 62.1 +/- 12.9 ms in the ipsilateral hemisphere and 65.9 +/- 14.8 ms in the contralateral hemisphere. The latency for the first molar was 47.4 +/- 6.6 ms in the ipsilateral hemisphere and 47.8 +/- 9.1 ms in the contralateral hemisphere. The latency for the first molar was significantly shorter than that for the canine. The equivalent current dipoles were estimated in the central sulcus and localized anteroinferiorly compared to the locations for the SEFs for the median nerve. No significant differences in three-dimensional coordinates were found between the canine and first molar. These findings demonstrate the precise location of the teeth within the orofacial representation area in the primary somatosensory cortex.