Murata H, Shigeto N, Hamada T
Department of Prosthetic Dentistry, Hiroshima University School of Dentistry, Japan.
J Oral Rehabil. 1990 Jul;17(4):365-75. doi: 10.1111/j.1365-2842.1990.tb00021.x.
In order to measure the viscoelastic properties of tissue conditioners, a series of stress relaxation tests was carried out using poly ethyl methacrylate polymer powders and liquids composed of butyl phthalyl butyl glycolate/ethyl alcohol mixtures, respectively. The analysis method using the Maxwell model analogy is discussed. The results may be summarized as follows. (i) In this study it was feasible to make the stress relaxation curves for 30 min analogous to the Maxwell model, using a model with a maximum of 5 elements. (ii) The elastic modulus Ei, the coefficient of viscosity eta i, and relaxation time tau i, for each element, and the instantaneous modulus E0, tended to increase with time. These values in the element of the longest relaxation time were most marked in the increase among those in all the elements. Furthermore, in every element the rate of increase of eta i was greater than that of Ei. The method described is considered to be one of the most useful techniques available for the study of the viscoelastic properties of tissue conditioners.
为了测量组织调理剂的粘弹性，分别使用聚甲基丙烯酸乙酯聚合物粉末和由丁基邻苯二甲酰丁二醇酯/乙醇混合物组成的液体进行了一系列应力松弛试验。讨论了使用麦克斯韦模型类比的分析方法。结果可总结如下。(i) 在本研究中，使用最多5个元件的模型，使30分钟的应力松弛曲线类似于麦克斯韦模型是可行的。(ii) 每个元件的弹性模量Ei、粘度系数ηi和松弛时间τi，以及瞬时模量E0，都倾向于随时间增加。在所有元件中，最长松弛时间元件的这些值增加最为显著。此外，在每个元件中，ηi的增加速率大于Ei的增加速率。所描述的方法被认为是研究组织调理剂粘弹性最有用的技术之一。
