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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 II--An evaluation of the Casting-Ring Test at 10 laboratories.
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Measurement of the setting expansion of phosphate-bonded investment materials: part II--An evaluation of the Casting-Ring Test at 10 laboratories.

机译：磷酸盐粘结的投资材料凝固膨胀的测量：第二部分-在10个实验室进行的铸造环试验的评估。

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摘要

The Casting-Ring Test has the potential to fulfil the requirement for a reliable 'Standard' test to measure the setting expansion of phosphate-bonded investment materials. The purpose of this study was to investigate the reproducibility of the measurements and the value that is produced at 10 test sites. The Casting-Ring Test apparatus, three phosphate-bonded investment products and one ring liner product were sent to the 10 participants, together with a detailed test protocol. Participants were asked to use their normal vacuum mixers. Reproducibility at individual sites was good. However, there were significant differences between test sites for the mean setting expansions, attributed to the range of vacuum mixers employed. From these results, the Casting-Ring Test appears to satisfy the requirements for adoption as an ISO standard test. The effect produced by different vacuum-mixer models would be manifest in any test. Not only does this have implications when determining the value of setting expansion for product information, but such a range of setting expansions will also be reproduced during production of moulds in commercial dental laboratory practice. However, for any specific product and vacuum-mixer combination, the setting expansion will be consistent and will not vary from mould to mould.
机译：铸环测试有可能满足对可靠的“标准”测试的要求，以测量磷酸盐粘结的投资材料的凝固膨胀。这项研究的目的是调查测量值的可重复性以及在10个测试位置产生的值。铸环测试设备，三种磷酸盐粘结的投资产品和一种环衬产品被发送给了10名参与者，并附有详细的测试规程。要求参与者使用其正常的真空混合器。各个站点的重现性都很好。但是，由于采用的真空混合器的范围，平均设置膨胀在测试位置之间存在显着差异。从这些结果来看，铸环试验似乎满足了采用ISO标准试验的要求。在任何测试中都将体现出不同真空混合器模型产生的效果。在确定产品信息的定型扩展值时，这不仅具有含义，而且在商业牙科实验室实践中的模具生产过程中，还将复制这样的定型扩展范围。但是，对于任何特定的产品和真空混合器组合，凝结扩展将是一致的，并且不会因模具而异。

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