How the condition of occlusal support affects the back muscle force and masticatory muscle activity?

Research Japanese OPEN
石岡, 克 ; 河野, 正司 ; Ishioka, Masaru ; Kohno, Shoji (2002)
  • Publisher: 新潟歯学会
  • Journal: 新潟歯学会雑誌, volume 32, issue 2, pages 59-65 (issn: 0385-0153)
  • Subject: 身体運動能力 | 咬合支持 | 咬合と全身
    mesheuropmc: equipment and supplies | body regions | stomatognathic diseases | musculoskeletal diseases | stomatognathic system

This study was conducted to determine how the condition of occlusal support affects the back muscle force and masticatory muscle activity. Two groups of subjects were enlisted: sport-trained group and normal group. While electrodes of the electromyography (EMG) were attached to the surface of the masticatory muscles, each subject's back muscle force was recorded during upper body stretching using a back muscle force-measuring device. The task was performed under four different occlusal support conditions: without occlusal splint, with a full-mouth occlusal splint, with a molar splint, and with a anterior splint. Results showed that without occlusal splint, the masticatory muscle activity was observed in all the subjects when they made the task freely (without clenching instruction). However, upon clenching instruction, the back muscle force did not always increase. The back muscle force decreased accordingly under the four conditions: without splint, with full-mouth splint, molar splint, and anterior splint. The importance of mandibular stability was demonstrated by the molar occlusal support. In all conditions, the sport-trained group showed greater back muscle force than the normal group.
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