• 作者： 蕭裕源
• 作者服務機構： 國立臺灣大學醫學院牙醫學系
• 中文摘要： 在閉口肌等長收縮狀態，輕敲頦部 (Menton area) 可以引發肌電圖靜期 (EMG silentperiod)。本報告利用15 位關節與肌肉疼痛機能障礙症候群患者，來觀察他們的肌電圖靜止期。 這些患者具備下列單項或多項與此症有關的症候： 1. 關節或圍蹺關節之咀嚼肌有疼痛或觸痛。 2. 開口或閉口時關節作響。 3. 開口範圍受限，閉口肌亢長（開口寬度自上門齒尖至下門齒尖距離不及40毫米）。 4. 關節習慣性脫臼或次脫臼。 5. 開口時下顎骨有偏離運動。 另外，選15位全無上述症狀的人作對照組。比較結果，實驗組和對照組之肌電圖靜止期平均值各為 50.6 12.4 和 25.6 7.6 毫秒。其平均值差異統計上具有意義。但靜止期的延長和症狀嚴重程度並無關係。
• 英文摘要： Electromyographic silent period could beinduced by tapping the menton area when theelevator muscles were in isometric contraction.Fifteen patients, four males and eleven females,were collected for the observation of their EMGsilent period changes. All of them had one or more of the fol-lowing symptoms and signs related to TMJ-muscle-pain-dysfunction syndrome. 1. Pain and/or tenderness at the joint ormasticatory muscles around the joint; 2. Clicking of the joint during mouthopening or closing; 3. Hypertonicity of the elevator musclesand opening limitation. (less than 40 mm openingbetween upper and lower central incisors). 4. Luxation and subluxation; and 5. Deviation of the mandible during ope-ning. A control group of fifteen subjects who didnot have any of the above symptoms and signswas collected for comparison. The EMG silent period of the patients hadan average of 5.06 12.4 msec, and that of thecontrol was 25.6 7.6 msec. The difference be-tween them was statistically significant. Theprolongation of the silent period did not cor-relate with the severity of the symptom.
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