Shahi Shahriar, Rahimi Saeed, Yavari Hamid Reza, Ghasemi Negin, Rezaie Yashar, Mirzapour Samira
Dental and Periodontal Research Center, Dental School, Department of Endodontics, Tabriz University of Medical Sciences, Tabriz, Iran.
Department of Operative Dentistry, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran.
Iran Endod J. 2018 Spring;13(2):200-203. doi: 10.22037/iej.v13i2.14683.
During periapical surgery, using of bone products in large endodontic lesions, is a treatment option that could affect the properties of the retro-filling endodontic material. The aim of present study was to evaluate the effect of Osteon II bone powder on the surface microhardness of calcium-enriched mixture (CEM) and mineral trioxide aggregate (MTA).
Each material was mixed and carried into 40 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 Vickers microhardness test. The data were analyzed statistically using two-way ANOVA and independent -test at a significance level of 0.05.
The highest and lowest microhardness values were recorded in the MTA/without Osteon and MTA/with Osteon groups, respectively. Irrespective of the presence or absence of bone powder, the overall microhardness of CEM cement and MTA was not significantly different. In the MTA group, the presence of the powder resulted in a significant decrease (<0.05) of the microhardness; however, its effect on CEM cement was not significant (>0.05).
Under the limitations of the present study, the presence of Osteon bone powder had no negative effect on the microhardness of CEM cement, contrary to its effect on MTA.
在根尖手术中，对于大型牙髓病变使用骨产品是一种可能会影响根管倒充填材料性能的治疗选择。本研究的目的是评估Osteon II骨粉对富钙混合物（CEM）和三氧化矿物凝聚体（MTA）表面显微硬度的影响。
将每种材料混合并装入40个无菌定制塑料圆柱体中。每组样本的一半暴露于Osteon II。所有圆柱体均浸没在模拟组织液中，在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。
MTA/无Osteon组和MTA/有Osteon组分别记录到最高和最低显微硬度值。无论是否存在骨粉，CEM水泥和MTA的总体显微硬度没有显著差异。在MTA组中，骨粉的存在导致显微硬度显著降低（<0.05）；然而，其对CEM水泥的影响不显著（>0.05）。
在本研究的局限性下，与对MTA的影响相反，Osteon骨粉的存在对CEM水泥的显微硬度没有负面影响。
