Iguchi S
Nihon Kyosei Shika Gakkai Zasshi. 1989 Jun;48(3):304-21.
Previous studies have shown that stress generated potential (SGP) with bone deformation caused by orthopedic force have an important role in regulation on bone remodeling. The purpose of this study was to evaluate the effects of the chin cap on bone remodeling by elucidating the characteristics and distribution of SGP at various parts on the mandible. Experiment was carried out using a mandible of macaca irus monkey which was kept in moisture with 0.9% saline. SGP was recorded using Ag-AgCl electrode from the 32 sections on the surface of the mandible. The force (3 kg) was applied to the chin with six load conditions. It simulated the force generated by chin cap. Temporomandibular joints and the soft tissue except masseter muscle were kept intact. The results were summarized as follows. 1. SGP was generated only when the load was applied or removed. No SGP was generated when the load was steady, even the absolute value was large. 2. When the interval between "on" and "off" of the load was shorted, generated SGP with "off" timing decreased, while that with "on" timing unchanged. 3. When the load was applied in the low pull direction under the centric occlusion, rather larger negative SGP was recorded at the chin, posterior sections of mandibular body and inferior border of the mandible. 4. When jaw was in closing position, high pull loading generated larger SGP at the alveolar bone and the mandibular body than that with low pull loading, although their electric sign was the same at each recorded sections. 5. When jaw was in opening position, low pull loading generated larger SGP at the posterior parts of the alveolar bone and the mandibular body than that in closing position. 6. When a bite block was placed between the upper and lower teeth, larger amplitude in SGP was the evidence in all the recorded sections especially around the bite block. 7. SGP recorded at the posterior part of the mandible increased with the sliding of the location of the bite block towards posterior portion. 8. The electric sign and the amplitude in SGP and that of the stress analyzed by a finite element method were similar at the each sections on the mandible. This suggests SGP is related with the stress generated in the bone. The results suggested that effects of chin-cap on the bone remodeling might be dependent on the direction of the load, tooth contact, existence of bite block, and its location. Also dynamic loading was suggested to be more effective.
以往研究表明，矫形力引起的骨变形所产生的应力产生电位（SGP）在骨重塑调节中起重要作用。本研究的目的是通过阐明下颌骨各部位SGP的特征和分布，评估颏帽对骨重塑的影响。实验使用猕猴的下颌骨，用0.9%生理盐水保持湿润。用Ag-AgCl电极从下颌骨表面的32个部位记录SGP。在六种负荷条件下，对颏部施加3kg的力。模拟颏帽产生的力。颞下颌关节和除咬肌外的软组织保持完整。结果总结如下。1. 仅在施加或去除负荷时产生SGP。负荷稳定时不产生SGP，即使绝对值很大。2. 当负荷“开”和“关”之间的间隔缩短时，“关”时刻产生的SGP减少，而“开”时刻产生的SGP不变。3. 当在正中咬合下向低拉力方向施加负荷时，颏部、下颌体后部和下颌下缘记录到较大的负SGP。4. 当颌处于闭合位置时，高拉力负荷在牙槽骨和下颌体产生的SGP比低拉力负荷时大，尽管在每个记录部位它们的电信号相同。5. 当颌处于开口位置时，低拉力负荷在牙槽骨和下颌体后部产生的SGP比闭合位置时大。6. 当上、下牙之间放置咬块时，所有记录部位尤其是咬块周围的SGP振幅更大。7. 在下颌骨后部记录到的SGP随着咬块位置向后滑动而增加。8. 下颌骨各部位SGP的电信号和振幅与有限元法分析的应力的电信号和振幅相似。这表明SGP与骨中产生的应力有关。结果表明，颏帽对骨重塑的影响可能取决于负荷方向、牙齿接触、咬块的存在及其位置。此外，动态负荷似乎更有效。
