Effect of mild noxious stimulation of gingiva of maxilla molars with lower threshold on muscle hardness and shoulder pain or stiffness (<i>katakori</i>)

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  • 上顎最後臼歯後方の歯肉に対する微細突起刺激が僧帽筋の硬度および肩こりに及ぼす影響
  • ジョウガク サイゴ キュウシ コウホウ ノ シニク ニ タイスル ビサイ トッキ シゲキ ガ ソウボウキン ノ コウド オヨビ カタコリ ニ オヨボス エイキョウ

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<p>Introduction : The purpose of this study was to verify whether trapezius muscle hardness and shoulder pain or stiffness (katakori in Japanese) can be improved with mild noxious stimulation of the gingiva of maxilla molars using an instrument with fine protrusions made of silicone.</p><p>Methods : This was a randomized crossover study in which the order of rest and intervention was changed. The subjects were 26 healthy adults who were aware of having katakori. Frictional stimulation at 1 Hz for 1 min using a device with 100 0.08-mm tips densely packed in a 5-mm-diameter circular pedestal, which was molded from silicone, was used for the intervention to the gingiva of maxilla molars with a lower threshold. Muscle hardness was measured using shear wave elastography. Katakori was recorded using the Visual Analogue Scale (VAS).</p><p>Results : After the intervention the trapezium muscle hardness was reduced significantly. As a result of comparing the amount of change of rest with that of intervention, muscle hardness showed a more significant decrease in the intervention than rest. VAS of katakori was significantly reduced in both rest and intervention. However, there was no significant correlation between the amount of change of katakori and muscle hardness.</p><p>Conclusion : Muscle hardness in the trapezius muscle was reduced with mild noxious stimulation to the gingiva of maxilla molars with lower threshold. It was not clarified whether this decrease was associated with the improvement of katakori.</p>

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