Development of a new muscle dysfunction evaluation system focusing on grouped discharge

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K17120
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 57050:Prosthodontics-related
• Research Institution: Okayama University
• Principal Investigator: MAEDA NAOTO 岡山大学, 歯学部, 博士研究員 (10708051)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 咬筋 / 表面筋電図 / 顎関節症 / 群化放電 / 疲労

Outline of Final Research Achievements

The purpose of this study was to investigate in detail the grouping discharge waveform observed on the masseter electromyogram. Although it has been reported that the grouped discharge waveform is associated with fatigue, there is no research on the grouped discharge of the masseter muscle in the world.
In this study, we analyzed the expression characteristics of the grouped discharge waveform in the masseter EMG recording of healthy subjects and patients with myofascial pain. As a result, it was found that the grouped discharge waveform was more frequently expressed in the masseter electromyogram of patients with temporomandibular disorders with muscular symptoms than in healthy adults. In the future, it is expected to develop a new diagnostic system for muscle dysfunction using the grouped discharge waveform.

Free Research Field

歯科補綴学

Academic Significance and Societal Importance of the Research Achievements

本研究から，群化放電波形は筋筋膜痛を有する顎関節症患者に多く認められることが分かった．筋・筋膜性疼痛は臨床上遭遇する機会が多いが，レントゲン，MRI，血液検査など一般的に行われる検査では目に見える結果として現れないため，診断，治療が困難である．さらに，頭頸部の筋に関しては十分な科学的検討がなされていない現状がある．
これらのことから，本結果は，未だ科学的データの少ない顎口腔系の種々の機能異常と咀嚼筋活動との関連を明らかにする上で重要な意義を有すると考えられる．