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- The Effects of Maximum Centric Clenching on the Velocity of Mandibular Movement
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題名 | The Effects of Maximum Centric Clenching on the Velocity of Mandibular Movement=中心咬牙對下顎運動速度的影響 |
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作者 | 吳慶榕; | 書刊名 | 北醫學報 |
卷期 | 23:1 1994.06[民83.06] |
頁次 | 頁25-34 |
分類號 | 416.92 |
關鍵詞 | 中心咬牙; 下顎運動速度; Centric clenching; Mandibular movement velocity; |
語文 | 英文(English) |
中文摘要 | 肌電圖與能量光譜分析曾被廣泛用來探討肌肉的疲勞效應。但肌肉疲勞對下顎運動速度的影響則不是很清楚。本研究的目的即在探討最大中心咬牙對下顎運動速度的影響。十八位牙科學生(十二位男性,六位女性,其平均年齡介于二十一歲至二十六歲間)參與此實驗。利用下顎運動描繪器(K-6)來測量受測者在約二分鐘最大中心咬牙前後的下顎運動速度變化。每位受測者被要求盡其可能作最大及最快的下顎運動。我們記錄連續十次的開閉口運動速度來分析下列參數(1)最大開口及閉口速度。(2)平均開口及閉口速度(3)牙齒接觸前的最大速度。十次運動速度的平均值利用統計方法分析咬牙前後的運動速度變化。實驗結果分析顯示二分鐘最大中心咬牙後其下顎最大及平均開閉口速度均不受中心咬牙影饗(P > O.O5)。牙齒接觸前的最大閉口速度亦不受中心咬牙後的影響(P > 0.05)。 結論:再此實驗條件下,二分鐘的最大中心咬牙似乎不影響下顎數度的改變。 |
英文摘要 | Muscle fatigue has been studied fairly extensively by using EMG and power spectral analysis. However, its influence on the velocity of jaw movement is unclear. The purpose of this study is to determine the influence of maximal centric clenching on the velocity of mandibular movement. Eighteen dental stu-dents (12 males. 6 females, ages ranged from 21 yrs to 26 yrs) were observed by using Myotronic Kinesiograph K-6 model for the measurement of jaw motion velocity before and immediately after two minutes maximal centric clenching (MVC) {Christensen 1986). Each subject was instructed to open and close as wide and fast as possible. Ten continuous open-close strokes were recorded and processed for evaluating the folowing parameters (1) the maximal opening and closing velocity, (2) the average opening and closing velocity and {3} the maximal velocity of terminal tooth contact. Mean velocity of ten movement strokes was used for comparing the result by pair t-test. Analysis of data in-dicated that neither the maximal opening and closing velocity nor the average opening and closing velocity was changed (P > 0.05). The maximal terminal velocity before tooth contact was not changed either (P > 0.05). In conclusion, under the condition of this study the effect of two minutes maximal centric clenching on the alteration of mandibular movement velocity is not influential. |
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