DISPLACEMENT RHEOMETER - A METHOD OF MEASURING WORKING TIME AND SETTING TIME OF ELASTIC IMPRESSION MATERIALS
DISPLACEMENT RHEOMETER - A METHOD OF MEASURING WORKING TIME AND SETTING TIME OF ELASTIC IMPRESSION MATERIALS
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DOI：
10.1016/0300-5712(93)90013-g
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发表时间：
1993-12-01
影响因子：
4.4
通讯作者：
WASSELL, RW
中科院分区：
文献类型：
--
作者：
ABUASI, HA;MCCABE, JF;WASSELL, RW
提出了一种测量弹性印模材料工作时间和凝结时间的新方法。使用位移流变仪监测弹性体在固化过程中的弹性发展情况。将位移流变仪的结果与ISO试验结果以及受控应力流变仪的结果进行了比较。使用ISO方法的工作时间是根据规范中描述的标准方法计算的，而对于受控应力流变仪和位移流变仪，工作时间都是在23℃下观察到初始弹性恢复的时间。对于置换流变仪，凝结时间是指混合材料在37℃时达到最佳弹性回复的时间。用方差分析进行统计分析表明，对于五种测试材料，三种方法之间没有差异。对于其中三种材料，ISO方法测定的工作时间明显长于其他两种方法测定的工作时间。讨论了各种方法的优缺点，并推荐用位移流变仪作为标准规范方法的补充。
A new method of measuring both working time and setting time of elastomeric impression materials has been developed. A Displacement Rheometer was used to monitor the development of elasticity in setting elastomers. The results obtained with the Displacement Rheometer were compared to the results of the ISO test as well as those of the Controlled Stress Rheometer. Working time using the ISO method was calculated according to the standard method described in the specification, while for both the Controlled Stress Rheometer and the Displacement Rheometer working times were the times when initial elastic recovery was observed at 23-degrees-C. With the Displacement Rheometer the setting time is the time when the mixed material reaches optimal elastic recovery at 37-degrees-C. Statistical analysis with ANOVA showed that for five of the test materials there were no differences between the three methods. For three of the materials the working time determined by the ISO method was significantly longer than that determined by the other two methods. The advantages and disadvantages of each method are discussed and the Displacement Rheometer is recommended as a supplement to the standard specification method.