Department of Metallurgy and Materials Engineering, Faculty of Engineering, University of Malta, Msida, Malta.
Int Endod J. 2013 Feb;46(2):179-86. doi: 10.1111/j.1365-2591.2012.02108.x. Epub 2012 Jul 27.
To introduce and assess a novel method for measuring washout resistance of cement-based dental materials, including mineral trioxide aggregate (MTA), to qualitatively verify the results with a clinical simulation and to evaluate the washout resistance of a new root-end filling material.
A method for assessment of washout resistance of root-end filling materials was developed by adapting the CRD-C 661-06 (a method for evaluating the resistance of freshly mixed concrete to washout in water), to permit testing of dental cements. White Portland cement (PC), MTA-Plus mixed with either water or a polymer-based antiwashout gel (MTA-AW), MTA-Angelus, IRM and amalgam were tested with either distilled water or HBSS as washout media. Additionally, the washout resistance was tested qualitatively by spraying the test materials at the terminus of simulated canals with a metered jet of water.
A mass loss of 2-7% for PC, 0.4-4% for MTA-Plus, -0.9% for MTA-AW, 5-10% for MTA-Angelus and 0% for IRM and amalgam was recorded with the modified CRD-C 661-06 method. No significant difference was found between using water and HBSS as washout media for the same material. The results of the modified CRD-C 661-06 method were similar to those obtained on the simulated canals.
The modified CRD-C 661-06 method provided repeatable results that were comparable to the simulated clinical method. The antiwashout gel used with MTA-Plus reduced the material washout and was similar to IRM and amalgam.
介绍并评估一种新型的测量基于水泥的牙科材料（包括三氧化矿物聚合体，MTA）冲洗阻力的方法，用临床模拟来定性验证结果，并评估一种新型根管封闭材料的冲洗阻力。
通过改编 CRD-C 661-06（一种评估新拌混凝土在水中抗冲洗能力的方法），开发了一种评估根管封闭材料冲洗阻力的方法，以允许测试牙科水泥。普通硅酸盐水泥（PC）、与水或聚合物基抗冲洗凝胶（MTA-AW）混合的 MTA-Plus、MTA-Angelus、IRM 和银汞合金分别用蒸馏水或 HBSS 作为冲洗介质进行测试。此外，通过用计量的水流喷射模拟根管末端的测试材料，对冲洗阻力进行定性测试。
用改良的 CRD-C 661-06 方法记录 PC 的质量损失为 2-7%，MTA-Plus 的质量损失为 0.4-4%，MTA-AW 的质量损失为-0.9%，MTA-Angelus 的质量损失为 5-10%，IRM 和银汞合金的质量损失为 0%。对于同一材料，用水和 HBSS 作为冲洗介质没有发现显著差异。改良的 CRD-C 661-06 方法的结果与模拟根管的结果相似。
改良的 CRD-C 661-06 方法提供了可重复的结果，与模拟临床方法相当。与 MTA-Plus 一起使用的抗冲洗凝胶减少了材料的冲洗流失，与 IRM 和银汞合金相似。
