title: [A study of muscle pressure in making functional impression. Horizontal and vertical forces on oral vestibulum of maxilla with full natural dentition].
abstract: The purpose of this thesis was to establish objectively a technique for muscle training in functional impression of denture space. Ten normal subjects in their twenties were employed. Small transducers were placed in labial and buccal sides of gingival mucosa of the maxilla. The horizontal and vertical muscular forces of the molar, premolar and anterior regions were recorded simultaneously during rest position, during the application of Myomonitor, during pronunciation and during the fourteen types of functional movements relating to muscle training. The data were statistically analyzed and the following results were obtained. 1. The average muscular force during rest position was minimal in all areas measured and could be used as standard for other functional movements. 2. Each type of functional movement had its distinct muscular force in all areas measured and there were significant differences among the areas of measurement and among the directions of measurement. 3. The functional movements that showed maximum muscular force were, in the anterior region, suction of the index finger for both vertical and horizontal directions, in the premolar region, suction of the index finger for horizontal direction and rotation of the cheek for vertical direction, in the molar region, inward rolling of upper lip for both directions. 4. The number of functional movement which showed significant differences in the muscular forces among directions tend to increase as one move from anterior to premolar and to molar region. In this case the horizontal forces became larger than the vertical forces. Also both the horizontal and vertical forces tend to increase as one move anteriorly. 5. The muscular forces obtained from the rotation movement made by the subject were larger than the forces of the rotation movement made by the clinicians in all areas measured. 6. The average muscular force during the application of Myo-monitor was minimal and similar to the force during rest position. 7. There was a large difference among individuals in the muscular forces during pronunciation, and all were below the average force of the fourteen functional movements. 8. From the above results it is suggested that a technique for muscle training be established objectively for the functional impression of maxillary labial and buccal denture space.
authors.forename: K
authors.initials: K
authors.lastname: Inatomi
authors.forename: Y
authors.initials: Y
authors.lastname: Kobayashi
mesh_terms: D000328:Adult; D001732:Bite Force; D003761:Dental Impression Technique; D003766:Dental Occlusion; D006801:Humans; D008410:Masticatory Muscles / Q000502:physiology*