Rahimi Saeed, Shahi Shahriar, Torabi Zahra, Rezaie Yashar, Ghasemi Negin, Abolhasani Somayeh
Department of Endodontics, Dental and Periodontal Research Center, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran.
Dental School, Tabriz University of Medical Sciences, Tabriz, Iran.
Iran Endod J. 2018 Winter;13(1):83-87. doi: 10.22037/iej.v13i1.14953.
This study was designed to determine the effect of Osteon II mineralized bone powder on the surface microhardness of two retrofilling materials: Mineral trioxide aggregate (MTA) and Biodentine (BD).
Each retrograde material was mixed and carried into 30 sterile custom-made plastic cylinders. Half of the samples in each group were exposed to Osteon II. All cylinders were submerged in simulated tissue fluid and incubated at 37C and 100% relative humidity for 7 days. Surface microhardness values of each study group was attained using Vicker's microhardness test. The data were analyzed statistically using two-way ANOVA and independent test at a significance level of 0.05.
In all the setting conditions, BD had significantly greater surface microhardness than MTA (<0.001). Surface microhardness of both materials was significantly reduced in the presence of osteon II (=0.006 for BD and <0.001 for MTA).
Mineralized bone graft materials negatively affect surface microhardness of both MTA and BD. In presence of osteon II, BD had the highest surface microhardness.
本研究旨在确定骨源II矿化骨粉对两种根管倒充材料的表面显微硬度的影响，这两种材料分别是三氧化矿物凝聚体（MTA）和生物活性玻璃陶瓷（BD）。
将每种根管倒充材料混合后装入30个无菌定制塑料圆柱体中。每组样本的一半暴露于骨源II。所有圆柱体均浸没在模拟组织液中，于37℃和100%相对湿度下孵育7天。使用维氏显微硬度测试获得每个研究组的表面显微硬度值。数据采用双向方差分析和独立样本t检验进行统计学分析，显著性水平为0.05。
在所有设定条件下，BD的表面显微硬度显著高于MTA（P<0.001）。在骨源II存在的情况下，两种材料的表面显微硬度均显著降低（BD为P=0.006，MTA为P<0.001）。
矿化骨移植材料对MTA和BD的表面显微硬度均有负面影响。在骨源II存在的情况下，BD具有最高的表面显微硬度。
