Rouhani Armita, Azimi Niloofar, Akbari Majid, Ahmadpour Ali, Ashrafpour Ehsan
Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Private Practice, Mashhad, Iran.
Iran Endod J. 2019 Summer;14(3):197-201. doi: 10.22037/iej.v14i3.23010.
The aim of this study was to evaluate the effect of addition of nano-silica (SiO) to mineral trioxide aggregate (MTA) on its setting time and porosity.
The concentration 8% of nano-silica were prepared and added to the MTA powder. After mixing with water the setting time and porosity were evaluated and compared with pure MTA. Statistical analysis was performed using the -test. The level of significance was set at 0.001.
The mean setting time of MTA+8% nano-silica (9.8±0.78) was significantly lower than MTA (23.3±2.16) <0.001). Also the mean porosity by imbibition method in MTA+8% nano-silica (23.49±0.48) was significantly higher than MTA (15.69±2.10) (<0.001). There was no significant difference in mean porosity by scanning electron microscope (SEM) method in MTA+8% nano-silica (31.26±10.73) and MTA (32.74±5.26) (>0.001).
This study showed us an addition of 8% of nano-silica to MTA reduced the setting time. Although evaluation by imbibition test showed increasing of porosity in nano-silica MTA compared with pure MTA.
本研究旨在评估向矿物三氧化物凝聚体（MTA）中添加纳米二氧化硅（SiO）对其凝固时间和孔隙率的影响。
制备8%浓度的纳米二氧化硅并添加到MTA粉末中。与水混合后，评估凝固时间和孔隙率，并与纯MTA进行比较。使用t检验进行统计分析。显著性水平设定为0.001。
MTA + 8%纳米二氧化硅的平均凝固时间（9.8±0.78）明显低于MTA（23.3±2.16）（P<0.001）。同样，采用吸液法测得的MTA + 8%纳米二氧化硅的平均孔隙率（23.49±0.48）明显高于MTA（15.69±2.10）（P<0.001）。通过扫描电子显微镜（SEM）法测得的MTA + 8%纳米二氧化硅（31.26±10.73）和MTA（32.74±5.26）的平均孔隙率无显著差异（P>0.001）。
本研究表明，向MTA中添加8%的纳米二氧化硅可缩短凝固时间。尽管吸液试验评估显示，与纯MTA相比，纳米二氧化硅MTA的孔隙率有所增加。
