Department of Endodontics, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan.
Clin Oral Investig. 2012 Aug;16(4):1161-9. doi: 10.1007/s00784-011-0597-9. Epub 2011 Aug 2.
The objective of this study is to investigate the ability of a non-contact electromagnetic vibration device to assess a simulated periodontal ligament and alveolar bone conditions in experimental tooth models by applying mechanical parameters (resonant frequency, elastic modulus, and coefficient of viscosity). The non-contact electromagnetic vibration device was made up of three components: vibrator, detector, and analyzer. The experimental tooth model consisted of a cylindrical rod made of polyacetal, a tissue conditioner for soft lining material, and urethane or urethane foam to simulate the tooth, periodontal ligament, and alveolar bone, respectively. The tissue conditioner was prepared by mixing various volumes of liquid with powder. Periotest values (PTVs) were also measured under the same conditions as those of the non-contact electromagnetic vibration device. All of the mechanical parameters derived from the non-contact electromagnetic vibration device significantly decreased as the proportion of liquid increased. Values for the three parameters of the urethane models were significantly larger than those of the urethane foam models. In contrast, PTVs increased significantly as the proportion of liquid increased; however, no significant difference was observed between the urethane and urethane foam models. The non-contact electromagnetic vibration device may be capable of evaluating not only periodontal ligament conditions but also bone quality. Mechanical parameters may be useful for assessing qualitative changes in the periodontal ligament and alveolar bone.
本研究旨在通过应用机械参数（共振频率、弹性模量和粘性系数）来探讨非接触电磁振动装置评估模拟牙周韧带和牙槽骨状况的能力。非接触电磁振动装置由三个部分组成：振动器、探测器和分析仪。实验牙模型由聚缩醛制成的圆柱形棒、软组织调节剂（用于软衬材料）以及用于模拟牙齿、牙周韧带和牙槽骨的聚氨酯或聚氨酯泡沫组成。软组织调节剂是通过将不同体积的液体与粉末混合制备而成。在与非接触电磁振动装置相同的条件下，还测量了 Periotest 值（PTVs）。所有源自非接触电磁振动装置的机械参数均随液体比例的增加而显著降低。聚氨酯模型的三个参数值显著大于聚氨酯泡沫模型的值。相比之下，PTVs 随液体比例的增加而显著增加；然而，在聚氨酯和聚氨酯泡沫模型之间未观察到显著差异。非接触电磁振动装置可能不仅能够评估牙周韧带状况，还能够评估骨质量。机械参数可能有助于评估牙周韧带和牙槽骨的定性变化。
