Adl Alireza, Shojaee Nooshin Sadat, Sobhnamayan Fereshte, Hashemzade Mohammadsaeed
Dept. of Endodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Student, Biomaterial Research Centre, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
J Dent (Shiraz). 2015 Mar;16(1):37-41.
In clinical situations, Calcium-Enriched Mixture (CEM) comes into direct contact or even mixes with blood during or after placement.
The aim of this study was to evaluate the effect of blood contamination on the compressive strength of CEM.
Three experimental groups were included in this study. In the first group, CEM was mixed with distilled water and was exposed to normal saline (control group). In the second group, CEM cement was mixed with distilled water and then was exposed to blood. In the third group, CEM was mixed with and exposed to blood. Nine custom-made two-part split Plexiglas molds with five holes were used to form CEM samples for compressive strength testing (15 samples in each group). After 7 days of incubation, compressive bond strength testing was performed using a universal testing machine. Data were statistically analyzed using the Mann-Whitney U test with a significance level of p< 0.05.
Nine samples from group 3 were fractured during removal from the molds; the other six blocks had some cracks on their surfaces. Therefore, a compressive strength measurement was not obtainable for this group. No statistically significant difference was found between groups 1 and 2 (p> 0.05).
It can be concluded that exposure to blood does not adversely affect the compressive strength of CEM, but incorporation of blood makes the cement very brittle.
在临床情况下，富钙混合物（CEM）在放置过程中或放置后会直接与血液接触甚至混合。
本研究的目的是评估血液污染对CEM抗压强度的影响。
本研究包括三个实验组。第一组，将CEM与蒸馏水混合并暴露于生理盐水中（对照组）。第二组，将CEM水泥与蒸馏水混合，然后暴露于血液中。第三组，将CEM与血液混合并暴露于血液中。使用九个定制的带有五个孔的两部分式有机玻璃模具来制作用于抗压强度测试的CEM样品（每组15个样品）。孵育7天后，使用万能试验机进行抗压粘结强度测试。使用Mann-Whitney U检验对数据进行统计学分析，显著性水平为p < 0.05。
第三组的九个样品在从模具中取出时断裂；其他六个块体表面有一些裂缝。因此，该组无法获得抗压强度测量值。第一组和第二组之间未发现统计学上的显著差异（p > 0.05）。
可以得出结论，暴露于血液不会对CEM的抗压强度产生不利影响，但加入血液会使水泥变得非常脆。
