Differential roles of periodontal mechanoreceptors of working-side posterior teeth in triggering nonworking-side temporalis activities.
Differential roles of periodontal mechanoreceptors of working-side posterior teeth in triggering nonworking-side temporalis activities.
复制标题
工作侧后牙牙周机械感受器在触发非工作侧颞肌活动中的不同作用。
DOI：
10.11480/jmds.500107
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发表时间：
2003
影响因子：
--
通讯作者：
K. Soma
中科院分区：
文献类型：
--
作者：
Hiroaki Kirimoto;Y. Seki;K. Soma
本研究的目的是研究工作侧上颌骨后牙的牙周感觉输入在咀嚼缓慢闭合阶段的起始颌位对非工作侧颞前肌活动的影响。6名咬合正常的受试者被要求咬合切牙，以保持缓慢闭合阶段的初始下颌位置，并产生闭合肌肉的活动。将双极针电极插入非工作侧前颞肌，以记录单个运动单位的棘波放电。为了刺激牙周力感受器，对工作侧上颌第一磨牙、第一和第二前磨牙在颊-腭部、腭颊和根尖方向进行机械刺激。同时，检测非工作侧前颞肌运动单位活动的放电频率的变化。我们发现，对工作侧上颌第一磨牙的腭颊刺激和对每颗工作侧上颌后牙的根尖刺激显著增加了非工作侧的前颞肌活动，而对第一和第二前磨牙的腭颊和颊腭侧刺激则不显著。因此，刺激工作侧上颌第一磨牙和前磨牙可以发现非工作侧前颞肌的不同反应。这些发现可能是由于磨牙和前磨牙在功能上的一些差异。
The purpose of this study was to examine how the periodontal sensory inputs of working-side maxillary posterior, teeth affect nonworking-side anterior temporalis activities at the starting jaw position of the slow-closing phase in mastication. Six subjects with normal occlusion were asked to bite an incisal block to maintain the initial jaw position of the slow-closing phase and to generate jaw-closing muscle activities. Bipolar needle electrodes were inserted into the nonworking-side anterior temporalis to record spike discharges from a single motor unit. To stimulate the periodontal mechanoreceptors, mechanical stimulations were applied to the working-side maxillary first molar, first and second premolar in bucco-palatal, palato-buccal, and apical directions. Meanwhile, we examined changes in the discharge frequency of the motor unit activities of the nonworking-side anterior temporalis. We found that the palato-buccal stimulation to the working-side maxillary first molar and the apical stimulation to each working-side maxillary posterior tooth significantly increased the nonworking-side anterior temporalis activities; however, palato-buccal and bucco-palatal stimulations applied to the first and second premolar didn't. Thus, differential responses of the nonworking-side anterior temporalis are found by the working-side maxillary first molar and premolar stimulations. These findings may be due to some differences in function between molar and premolar.