咬合高径の増大に伴う咬合接触時間・回数・持続時間の変化に関する研究
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The teeth will stop erupting and stabilize when they erupt and come to occlude with each other. So if a tooth fails to occlude, it will extrude beyond the occlusal line. But it will be intruded if it is crowned above the occlusal level. These phenomena suggest us that the occlusal contacts of the upper and lower teeth play an important part in stabilizing the vertical position of the teeth. Nevertheless, the true status has not been explained in detail. To make it more clear, I tried to find the change in the occlusal contact duration due to the increase of vertical dimension. For this, I had ten subjccts and each subject was worn his own bite plate on. And I measured the occlusal contact duration (total and respective) and frequency when the vertical dimension from the centric occlusion was increased temporally, ranging from 1mm to 5mm. The results were as follows : 1. The occlusal contact duration increased as the vertical dimension increased, and increased greatly especially when the dimensional change was over his own free way space. 2. The occlusal contact frequency increased, too, as the vertical dimension did, but decreased when the dimensional change was over his own free way space. 3. As for respective occlusal contact duration, the percentage of short contact duration decreased as the vertical dimension increased, and long contacts increased. The results mentioned above tell us that the upper and lower teeth are stabilized without any overeruption or depression by repeating a proper contact, and the balanced occlusion is maintained by means of muscles controlling the position and movement of the mandible. Therefore, it can be said that the teeth are depressed and the original vertical dimension is re-established, even if the vertical dimension is increased by a orthodontic treatment, without the muscular adaptation. So it may be concluded that the increase of the occlusal contact duration mainly cause the relapse of the vertical dimension.
- 九州歯科学会の論文
- 1978-03-31
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- 咬合高径の増大に伴う咬合接触時間・回数・持続時間の変化に関する研究 : 主論文の要旨
- 咬合高径の増大に伴う咬合接触時間・回数・持続時間の変化に関する研究