Suzuki Masaaki
Fixed Prosthodontics, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University.
Kokubyo Gakkai Zasshi. 2006 Mar;73(1):79-89. doi: 10.5357/koubyou.73.79.
This study evaluated the relationship between occlusal force and tooth displacement in function. The three-dimensional tooth displacement transducer Type M-3 was used to measure the tooth displacement path and a three-dimensional small occlusal force sensor was developed to detect the occlusal force. Subjects' teeth were the upper and lower first molars. The three-dimensional tooth displacement and occlusal force of the upper and lower first molars were measured at the same time during light and heavy clenching in vivo. The direction of the tooth displacement and that of the occlusal force of the upper first molar almost coincided and they were along the palato-apical direction. However, in the lower first molar, the direction of occlusal force was in the apical direction, and the tooth displacement path was along the lingual direction. There was no relationship between the direction of occlusal force and clenching intensity at the upper and lower first molars and no relationship was observed between the direction of tooth displacement and occlusal force at the lower first molar. However, the upper molars showed a tendency to move more in the palatal direction as the force increased. In the case of the upper first molar, the energy of force seemed to change with the distortion of the alveolar bone especially around the root surface. However, in the case of the lower first molar, the energy of this occlusal force might be absorbed by the deformation of the mandible.
本研究评估了功能状态下咬合力与牙齿位移之间的关系。使用M-3型三维牙齿位移传感器测量牙齿位移路径，并开发了一种三维小型咬合力传感器来检测咬合力。研究对象的牙齿为上下第一磨牙。在体内进行轻度和重度紧咬时，同时测量上下第一磨牙的三维牙齿位移和咬合力。上第一磨牙的牙齿位移方向与咬合力方向几乎一致，且均沿腭根方向。然而，在下第一磨牙中，咬合力方向为根尖方向，而牙齿位移路径沿舌侧方向。上下第一磨牙的咬合力方向与紧咬强度之间没有关系，在下第一磨牙中牙齿位移方向与咬合力之间也没有关系。然而，上磨牙随着咬合力增加有向腭侧移动更多的趋势。对于上第一磨牙，力的能量似乎随着牙槽骨尤其是牙根表面周围的变形而变化。然而，对于下第一磨牙，这种咬合力的能量可能被下颌骨的变形所吸收。
