Effects of the loss of occlusal supports on displacements of mandible and masticatory muscle activity.

DOI PubMed 2 Citations
  • Ogasawara Kouichi
    The First Department of Prosthodontics, Faculty of Dentistry, Tokyo Medical and Dental University

Bibliographic Information

Other Title
  • 支持点の違いが下顎の変位，そしゃく筋活動に及ぼす影響に関する研究

Search this article

Abstract

Fifteen occlusal supporting patterns were obtained from the variation of four occlusal metal stops set up on the mandibular bilateral first premolars and the second molars. Displacements of the mandible during maximal clenching was measured using the non-contact two-dimensional sensors in all of the supporting patterns. The masticatory muscle activity was recorded simultaneously by means of bipolar surface electrodes on five subjects. The posterior tilt of the mandible was found in the case of four stops and three stops not set up on the unilateral premolar. The non-supporting side of the mandible shifted superiorly in the case of three stops not set up on the unilateral molar and two stops set up unilaterally. As two stops set up on the bilateral premolars were present, the posterior tilt of the mandible was found. However, the mandible hardly tilted in the case of two stops set up on the bilateral molars. The anterior tilt of the mandible was recognized in the case of one stop set up on the unilateral molar. It was found that, depending on the subject, the non-supporting side shifted superiorly in the case of one stop set up on the unilateral premolar. As the number of the occlusal stops decreased, the total EMG activity of the anterior temporal and masseter muscles on both sides became reduced.

Journal

Citations (2)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top