種々の体位ならびに咬合記録術式が咬合位に及ぼす影響
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概要
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It is quite difficult to determine horizontal maxillomandibular relationship in edentulous subjects. Various recording methods such as gothic arch tracing, tapping method, and swallowing method have been adv ocated. However, no agreement has yet been reached as to which method may be the best. Therefore, normal dentulous subjects in whom centric occlusal position and condylar stability position coincided were selected and following studies were made. First, stability of habitual mouth closing position was studied by investigating the extent of anteroposterior and lateral deviations of tapping point. Second, the posture where the condylar position is closest to centric occlusal position was studied by varying postures and recording myo-centric position. Third, the extent of anteroposterior and lateral deviations from centric occlusal position of the mandible during swallowing and self-retraction was studied. The results were as follows : 1. Anteroposteriorly, tapping point was closest to centric occlusal position at upright position. The average deviation was 0.02±0.06mm. Laterally, tapping point was closest to centric occlusal position at 90°posterior inclination of the body axis. The average deviation was 0.02±0.08mm. 2. Tapping point was displaced posteriorly from centric occlusal position as the body axis was inclined posteriorly. 3. During all movements examined, tapping point was stable anteroposteriorly and laterally and approximated centric occlusal position. 4. Stroking was 1.5 - 2.1 times/sec when tapping were made during the exercise pattern proper to each subject. 5. Myo-centric position at upright position was located at 0.41±0.65mm anterior to centric occlusal position and at 0.05±0.33mm laterally. 6. Myo-centric position was displaced posteriorly when the body axis was inclined posteriorly by 30°, 60° and 90°. Laterally, myo-centric position tended to concentrate near centric occlusal position with posterior inclination of the body axis. 7. Centric occlusal position and myo-centric position approximately equal at 60° posterior inclination of the body axis. 8. Swallowing position was located at 0.17±0.21mm posterior to centric occlusal position at upright position and self-retraction position was at 0.52±0.30mm posterior. Lateral deviations were very slight for both.
- 九州歯科学会の論文
- 1983-02-25