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首页> 外文期刊>Journal of oral rehabilitation >Measurement of the setting expansion of phosphate-bonded investment materials: Part I - Development of the Casting-Ring Test.
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Measurement of the setting expansion of phosphate-bonded investment materials: Part I - Development of the Casting-Ring Test.

机译：磷酸盐粘结的投资材料凝固膨胀的测量：第一部分-铸造环试验的发展。

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摘要

The setting expansion is an important property for a phosphate-bonded investment material. This research was undertaken to investigate a test that might be suitable for its measurement when used in a Standard. In the 'Casting-Ring Test', the investment sample is contained in a steel ring and expands to displace a precisely positioned pin. Variables with the potential to alter routine reproduction of the value were investigated. The vacuum-mixer model is a production laboratory variable that must not be ignored and for this reason, experiments were repeated using a different vacuum-mixer located at a second test site. Restraint by the rigid ring material increased expansion, while force on the pin reduced it. Expansion was specific to the lining selected. Increased environmental temperature decreased the final value. Expansion was still taking place at a time at which its value might be measured. However, when these factors are set, the reproducibility of values for setting expansion was good at both test sites (coefficient of variation 14%, at most). The results revealed that with the control that is available reliable routine measurement is possible in a Standard test. The inter-laboratory variable, vacuum-mixer model, produced significant differences and it should be the subject of further investigation.
机译：凝结扩展对于磷酸盐粘结的投资材料而言是重要的属性。进行这项研究是为了研究一种在标准中使用时可能适合其测量的测试。在“铸造环测试”中，投资样品包含在一个钢环中，然后膨胀以移动一个精确定位的销。研究了可能改变值的常规再现的变量。真空混合器模型是生产实验室变量，不能忽略，因此，使用位于第二个测试站点的另一个真空混合器重复进行实验。刚性环材料的约束增加了膨胀，而销子上的力减小了它。扩展特定于所选衬里。环境温度升高会降低最终值。在可以评估其价值的时候，扩张仍在进行。但是，设置这些因素后，在两个测试位置上用于设置扩展值的可重复性都很好（变异系数最多为14％）。结果表明，通过可用的对照，在标准测试中可以进行可靠的常规测量。实验室间变量真空混合器模型产生了显着差异，应进一步研究。

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