Koran A, Powers J M, Craig R G
J Am Dent Assoc. 1977 Jul;95(1):75-9. doi: 10.14219/jada.archive.1977.0565.
The viscosity of commercially available impression materials used for making edentulous impressions was determined as a function of time and rotational speed. The impression materials studied showed large differences in viscosity and could be ranked into three groups. The values for one group--Plastogum, Ackerman cement (1:1 powder-to-liquid ratio), and light-bodied Permlastic--ranged from 23,800 cp to 57,200 cp. The viscosity values for a second group--Unilastic, syringe Elasticon, Luralite, and Coe-Flo--ranged from 92,200 cp to 107,000 cp. For a third group--Omniflex, Jeltrate, and Ackerman cement (2:1 powder-to-liquid ratio)--the viscosity values ranged from 239,000 cp to 257,000 cp. Light-bodied Permlastic, Ackerman cement (1:1 powder-to-liquid ratio), Jeltrate, and syringe Elasticon functioned as Newtonian liquids immediately after mixing. All other materials were non-Newtonian in behavior. The viscosity of most impression materials increased dramatically with time; the only exceptions were the zinc oxide-eugenol impression materials.
测定了用于制作无牙颌印模的市售印模材料的粘度与时间和转速的函数关系。所研究的印模材料在粘度上表现出很大差异，可分为三组。一组材料（Plastogum、Ackerman 水泥（粉液比 1:1）和轻质 Permlastic）的粘度值范围为 23,800 厘泊至 57,200 厘泊。第二组材料（Unilastic、注射用 Elasticon、Luralite 和 Coe - Flo）的粘度值范围为 92,200 厘泊至 107,000 厘泊。第三组材料（Omniflex、Jeltrate 和 Ackerman 水泥（粉液比 2:1））的粘度值范围为 239,000 厘泊至 257,000 厘泊。轻质 Permlastic、Ackerman 水泥（粉液比 1:1）、Jeltrate 和注射用 Elasticon 在混合后立即表现为牛顿流体。所有其他材料的行为均为非牛顿流体。大多数印模材料的粘度随时间急剧增加；唯一的例外是氧化锌 - 丁香酚印模材料。
