ヒツジ片側下顎頭切除が咀嚼筋活動に及ぼす影響

概要

論文の詳細を見る
Loss of a condyle by either surgery or trauma would be expected to have a marked effect on masticatory muscle function. This study is to quantify the effects on the masticatory muscles of unilateral loss of the condyle. The normal EMG pattern of five adult sheep was determined. Unilateral condylectomy was then performed. A measured 10 mm of the left condyle was excised as the wound closed in layers. Electromyographic recordings were then obtained at 1 week, 1 month, and 2 months post operatively. At one week post surgery the periods rhythmical mastication were short. This effect was noticed to a lesser degree at one month and two months. By that stage rhythmical chewing activities recurred and it was noticed that there was a preference towards chewing grass than oats. Generally there was no major change in masticatory movements following condylectomy although many small changes in muscle activity, both in terms of timing and discharge volume, were noted. After surgery, the duration of masseter muscle deep fibre(MD) EMG increased in both sides. The starting time of MD on the balancing side in normal mastication arose earliest, but the starting time of MD on the balancing side was similar to on the working side in condylectomy mastication. Less effect than expected following condylectomy was found. This in part may relate to the rhythmical lateral method of mastication used by ruminant herbivores. But it is considered that masseter muscle deep fibre plays the most important role in controlling the condyle movement.
九州保健福祉大学の論文
2003-03-25

ヒツジ片側下顎頭切除が咀嚼筋活動に及ぼす影響

スポンサーリンク

概要

著者

関連論文

スポンサーリンク