歯の力学的特性に関する基礎的研究
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概要
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In the dynamic tests, the results of only the impact bending, strength tests and the ultrasonic pulse-echo method have been reported, while no reports on the impact compression tests of tooth have been made available. There for, the author has undertaken a studay with a standpoint what behaviors the tooth will show against the compression force accompanying occlusion and mastication and also to clarifying the anisotropy and the mechanical properties of the tooth. The author used the split hopkinson pressure bar method to take measurements of the elastic modulus, stiffness, the maximum stress, solid viscosity and the maximum energy of the tooth with respect to its crown, neck and root. The measurement were taken on three planes, on the tooth's long axis, medio-distal and bucco-lingual direction. The directions to talled eight in the direction of 45° against each axis, of 30° and 60° incline from the axis towards the tooth's axis directions. As a result of the studay, the author arrived at the following conclusions. 1. The split hopkinson pressure bar method was used to measure some dynamic material propertise porous hard tissues, such as cortical bone and tooth. 2. Elastic modulus have a tendency to increase at tooth's long axis and bucco-lingual direction of root. Stiffness have a tendency to increase at bucco-lingual direction of crown. The maximum stress have a tendency to increase at tocth's long axis direction of root. Solid viscosity have a tendency to increase at tooth's long axis and bucco-lingual direction of root. The maximum energy have a tendency to increase bucco-lingual direction of root. 3. In the medio-distal direction of the tooth, the properties showed a trend similar to those of the bucco-lingual direction, but the elastic modulus, stiffness, the maximum stress and the maximum energy showed values lower than those of the long axial and bucco-lingual directions. 4. In the direction of 45° inclined from the long axial to the bucco-lingual direction, the measured values tended to be lower than those of the other direction. 5. Differences seen in the elastic modulus, stiffness, the maximum stress, solid viscosity and the maximum energy according to the direction and the region of measurement indicated a dependency on the direction. 6. An impact-response model was attempted, and theoretical an alysis were under taken of the anisotrophy.
- 社団法人日本補綴歯科学会の論文
- 1983-06-01