Samiei Mohammad, Janani Maryam, Asl-Aminabadi Naser, Ghasemi Negin, Divband Baharak, Shirazi Sajjad, Kafili Kayvan
Associate Professor, Department of Endodontics, Dental Faculty, Tabriz University (Medical Sciences), Tabriz, Iran.
Assistant Professor, Department of Endodontics, Dental and Periodontal Research Center, Dental Faculty, Tabriz University (Medical Sciences), Tabriz, Iran.
J Clin Exp Dent. 2017 Feb 1;9(2):e191-e195. doi: 10.4317/jced.53166. eCollection 2017 Feb.
Some of the efforts to improve the properties of Mineral Trioxide Aggregate (MTA) include incorporation of some nanoparticles such as Titanium dioxide (TiO2). The aim of this study was to evaluate the effect of TiO2 nanoparticles on the setting time, working time, push-out bond strength and compressive strength of MTA.
The physical properties to be evaluated were determined using the ISO 6786:2001 and 9917 specifications. Fifteen samples of each material (MTA or MTA with 1% weight ratio of TiO2 Nanoparticles) were prepared for any evaluated physical property. Data were analyzed using descriptive statistics and T-test. Statistical significance was set at <0.05.
There was the significant effect of the material type (presence and absence of TiO2 nanoparticles) on the push-out bond strength, compressive strength, working time and setting time, with significantly higher values achieved in the group with TiO2 nanoparticles than the group without these particles (=0.01 for the setting time and compressive strength, =0.03 for the working time and =0.001 for the bond strength).
Based on the findings of this study, incorporation of the TiO2 nanoparticles with weight ratio of 1% increased the setting time, working time, compressive strength and push out bond strength of MTA. Mineral trioxide aggregate, nanoparticles, physical properties, titanium dioxide.
改善三氧化矿物凝聚体（MTA）性能的一些努力包括加入一些纳米颗粒，如二氧化钛（TiO2）。本研究的目的是评估TiO2纳米颗粒对MTA的凝固时间、工作时间、推出粘结强度和抗压强度的影响。
使用ISO 6786:2001和9917规范来测定待评估的物理性能。为每种评估的物理性能制备15个每种材料的样品（MTA或含1%重量比TiO2纳米颗粒的MTA）。使用描述性统计和t检验分析数据。设定统计学显著性为<0.05。
材料类型（有无TiO2纳米颗粒）对推出粘结强度、抗压强度、工作时间和凝固时间有显著影响，含TiO2纳米颗粒组的值显著高于不含这些颗粒的组（凝固时间和抗压强度P = 0.01，工作时间P = 0.03，粘结强度P = 0.001）。
基于本研究结果，加入重量比为1%的TiO2纳米颗粒可增加MTA的凝固时间、工作时间、抗压强度和推出粘结强度。三氧化矿物凝聚体、纳米颗粒、物理性能、二氧化钛。
