Pang I C, Chai J
Department of Dentistry, Taichung Veterans General Hospital, Taiwan, Republic of China.
J Prosthet Dent. 1994 Aug;72(2):177-82. doi: 10.1016/0022-3913(94)90077-9.
The viscosities of 10 vinyl polysiloxane impression materials with and without the effect of a shear load were studied. Samples of each impression material were divided into two groups. An initial shear load of 5.12 rpm was applied to group A samples for 10 seconds. No shear load was applied to group B samples during the same interval of time. The viscosities of two groups of samples were compared at 60 seconds. Results indicated that there were statistically significant differences among the group A or B samples of the impression materials. There were no statistically significant differences between the group A and B samples of five impression materials. The group A samples displayed significantly lower viscosities than group B samples for two impression materials. The group A samples also displayed significantly higher viscosities than group B samples for three impression materials. It was concluded that the effect of a shear load had no consistent effect on the viscosities of a group of vinyl polysiloxane impression materials.
研究了10种乙烯基聚硅氧烷印模材料在有和没有剪切载荷作用下的粘度。每种印模材料的样品被分为两组。对A组样品施加5.12 rpm的初始剪切载荷，持续10秒。在相同的时间间隔内，B组样品未施加剪切载荷。在60秒时比较两组样品的粘度。结果表明，印模材料的A组或B组样品之间存在统计学上的显著差异。五种印模材料的A组和B组样品之间没有统计学上的显著差异。对于两种印模材料，A组样品的粘度显著低于B组样品。对于三种印模材料，A组样品的粘度也显著高于B组样品。得出的结论是，剪切载荷对一组乙烯基聚硅氧烷印模材料的粘度没有一致的影响。
