Chew C L, Chee W W, Donovan T E
School of Dentistry, National University of Singapore.
Int J Prosthodont. 1993 Nov-Dec;6(6):528-32.
It may be desirable to extend the working time of poly(vinyl siloxane) impression materials when making a multiple-unit impression. Alteration of the base-catalyst ratio is not possible with automix systems, but chilling the impression material provides an alternative. This study evaluated the dimensional accuracy of chilled impression material and the effect on accuracy of reheating the impression to mouth temperature prior to pouring. Two brands of poly(vinyl siloxane) impression material were evaluated both after refrigeration and at room temperature. Impressions were poured at room temperature and reheated to mouth temperature prior to pouring. Gypsum dies were recovered and measured. Refrigeration had no statistically significant effect on dimensional accuracy. Reheating the impression had no clinically significant effect on accuracy.
在制作多单位印模时，可能需要延长聚（乙烯基硅氧烷）印模材料的工作时间。自动混合系统无法改变基料与催化剂的比例，但冷却印模材料提供了一种替代方法。本研究评估了冷却后印模材料的尺寸精度以及在灌注前将印模重新加热至口腔温度对精度的影响。对两个品牌的聚（乙烯基硅氧烷）印模材料在冷藏后和室温下进行了评估。印模在室温下灌注，并在灌注前重新加热至口腔温度。回收并测量石膏模型。冷藏对尺寸精度没有统计学上的显著影响。重新加热印模对精度没有临床上的显著影响。
