Samiei Mohammad, Torab Ali, Abdollahi Amir Ardalan, Rostami Parisa
Department of Endodontics, Dental and Periodontal Research Center, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran.
Department of Prosthodontics, Dental and Periodontal Research Center, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran.
Iran Endod J. 2020 Spring;15(2):96-99. doi: 10.22037/iej.v15i2.27015.
The aim of this study was to compare the effect of sample preparation methods on push-out bond strength of mineral trioxide aggregate (MTA).
Twenty-four extracted human mandibular premolars with single root canal were selected for this study. After instrumentation, irrigation and drying of root canals, they were randomly divided into two experimental groups (=12). Group 1: After removing the 3 mm of root ends, 2 mm thick sections were established from the remaining roots. MTA was mixed following the manufacturers' recommendations and root sections were filled. Group 2: The whole root canal was used for filling and packing of MTA and like group 1, after removing the 3 mm of root ends, root sections were provided. Push-out bond strength was measured and analyzed by the independent t-test. Level of statistical significance was set at 0.05.
The highest mean push-out bond strength was in apical section of group 2 (4.86±1.31) and the lowest value was in coronal section of group 2 (3.05±1.15). The results of the independent t-test showed a significant difference between two groups only in the apical section (=0.02).
Based on the results of this study, the highest mean push-out bond strength was in apical section of group 2. It seems that using the whole root canal for MTA application is better for MTA analysis of bond strength to root dentin because it is more similar to the clinical conditions.
本研究旨在比较样本制备方法对三氧化矿物凝聚体（MTA）推出粘结强度的影响。
选取24颗拔除的单根管人类下颌前磨牙进行本研究。根管进行预备、冲洗和干燥后，随机分为两个实验组（每组n = 12）。第1组：去除根尖3mm后，从剩余牙根制备2mm厚的根段。按照制造商的建议混合MTA并充填根段。第2组：使用整个根管充填和压实MTA，与第1组一样，去除根尖3mm后制备根段。采用独立t检验测量和分析推出粘结强度。统计学显著性水平设定为0.05。
第2组根尖段的平均推出粘结强度最高（4.86±1.31），最低值在第2组冠段（3.05±1.15）。独立t检验结果显示，两组仅在根尖段存在显著差异（P = 0.02）。
基于本研究结果，第2组根尖段的平均推出粘结强度最高。对于MTA与牙根牙本质粘结强度的分析，似乎使用整个根管应用MTA更好，因为它更接近临床情况。
