Tomita Takashi, Tsukimura Naoki, Ohno Shigeru, Umekawa Yoshitada, Sawano Muneyuki, Fujimoto Toshiki, Takamura Masaaki, Majima Aiko, Katakura Yuusuke, Kurata Akemi, Ohyama Tetsuo, Ishigami Tomohiko
Department of Removable Partial Denture Prosthodontics, Nihon University School of Dentistry.
Nihon Hotetsu Shika Gakkai Zasshi. 2006 Apr;50(2):200-9. doi: 10.2186/jjps.50.200.
To consider changes in the physical properties of mouthguard materials with the change of temperature, shock-absorbing examination and Shore hardness measurement of existing MG materials and other elastic materials were carried out.
Both examinations were done under two temperature conditions: at room temperature (25 degrees C) and simulated intraoral temperature (37 degrees C). In addition, a comparative study of the relation between Shore hardness and shock absorption of the materials was made. A self-made drop impact machine was used for the shock-absorbing examination. The thickness of a sample was assumed to be 3 mm. The loading was applied by dropping 3 kinds of steel ball, phi 10 mm (4.0 g), phi 15 mm (13.7 g), and phi 20 mm (32.6 g) from a height of 60 cm. The shock absorption of all materials was compared by the maximum impact force. Shore hardness was measured based on the JIS standard.
The shock absorption of each material showed a different tendency depending on the loading condition. Furthermore, the shock absorption of the same material showed different results depending on the temperature condition. Shore hardness measurements tended to show low values with the condition of 37 degrees C for all materials.
From the relation between shock absorption and Shore hardness, it was confirmed that there is a correlation between hardness and the maximum impact force in the materials that showed shock absorption by elastic deformation. Some materials showed high shock absorption compared with existing MG materials.
为了研究护齿材料的物理性能随温度的变化情况，对现有护齿材料及其他弹性材料进行了减震测试和肖氏硬度测量。
两种测试均在两种温度条件下进行：室温（25摄氏度）和模拟口腔温度（37摄氏度）。此外，还对材料的肖氏硬度与减震性能之间的关系进行了对比研究。减震测试使用自制的落锤冲击试验机。样品厚度假定为3毫米。通过从60厘米高度掉落3种钢球（直径10毫米（4.0克）、直径15毫米（13.7克）和直径20毫米（32.6克））来施加负荷。通过最大冲击力比较所有材料的减震性能。肖氏硬度根据日本工业标准进行测量。
每种材料的减震性能根据负荷条件呈现出不同的趋势。此外，同一材料的减震性能根据温度条件呈现出不同的结果。所有材料在37摄氏度条件下的肖氏硬度测量值往往较低。
从减震性能与肖氏硬度的关系来看，证实了在通过弹性变形表现出减震性能的材料中，硬度与最大冲击力之间存在相关性。与现有的护齿材料相比，一些材料表现出较高的减震性能。
