Dynamic mechanical thermal analysis of denture soft lining materials.
Dynamic mechanical thermal analysis of denture soft lining materials.
复制标题
义齿软衬材料的动态机械热分析。
DOI：
10.1016/0142-9612(95)00330-4
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发表时间：
1996
期刊：
影响因子：
14
通讯作者：
V. Jerolimov
中科院分区：
文献类型：
--
作者：
M. Waters;R. Jagger;K. Williams;V. Jerolimov
本研究的目的是使用动态机械热分析来表征一系列长期义齿软衬材料的变形特性。在30-70 °C的温度范围内，使样品在1Hz的频率和64微米峰间应变下经受正弦剪切变形。该技术模拟了软衬材料在临床上会经历的变形类型和速率，从而产生比以前使用的方法更相关的结果。得到了每种材料的剪切模量G′、耗散模量G ″和机械损耗角正切G ″ G′。随着温度的升高，丙烯酸材料的模量降低，表明柔量增加和变形更大。在所选范围内，硅酮（Molloplast B）和替代制剂（Novus）的性能通常对温度不敏感。丙烯酸树脂的机械损耗角正切值随温度连续下降，表明增塑过程将Tg值降低到低于30 †C（测试的最低温度）。
The purpose of this study was to characterize the deformation properties of a range of long-term denture soft lining materials using dynamic mechanical thermal analysis. Specimens were subjected to sinusoidal shear deformation at a frequency of 1 Hz and a strain of 64 microns peak to peak over a temperature range of 30–70 °C. The technique simulated the type and rate of deformation soft lining materials would experience clinically, thus producing more relevant results than previously used methods. Shear modulus G′, dissipative modulus G′' and mechanical loss tangent G′' G′ were obtained for each material. With increasing temperature the moduli of the acrylic materials decreased, indicating an increased compliance and greater deformation. The silicone (Molloplast B) and alternative formulation (Novus) properties were generally insensitive to temperature over the range chosen. The mechanical loss tangent values of the acrylics fell continuously with temperature, suggesting that the plasticization process lowered the Tgvalues below 30 †C, the lowest temperature of testing.