作業側関節結節削除によるウサギ咀嚼様運動中の下顎頭運動の変化

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  • Changes in movements of the mandibular condyle after articular eminence resection on the working side during fictive mastication in rabbits
  • サギョウガワ カンセツ ケッセツ サクジョ ニ ヨル ウサギ ソシャク ヨウ ウンドウ チュウ ノ カガクトウ ウンドウ ノ ヘンカ

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The physiological load on the temporomandibular joint (TMJ) plays an important role in maintenance of normal morphological structure and functions of the TMJ. On the other hand, overload on the TMJ can cause temporomandibular disorders. Therefore, it is important to understand the magnitude and direction of load on the TMJ when studying the mechanism for maintenance of normal morphological structure and functions of the TMJ. The authors presumed that compressive force on the TMJ is manifested as movements of the mandibular condyle towards the articular eminence after resection of the articular eminence. Therefore, we estimated the magnitude and direction of load on the TMJ on the basis of changes in movements of the mandibular condyle before and after resection of the articular eminence. EMG activities of the masseter muscle were simultaneously recorded with movements of the condyle as well as the incisor point during fictive mastication induced by electrical stimulation to the cortical masticatory area of anesthetized rabbits. As a result, resection of the articular eminence caused no significant change in EMG activities of the masseter muscle or movements of the incisor point. However, the position of the trajectory of the mandibular condyle shifted in an anterosuperior direction after resection of the articular eminence. In addition, forward projecting movements of the mandibular condyle were seen in the occlusal phase. It was suggested that the TMJ was constantly exposed to a load during masticatory movements, particularly during the occlusal phase. Force holding the articular disc between the articular eminence and the mandibular condyle has an important role in preventing the development of space that would allow the articular disc to move anteriorly.

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