Nagas Emre, Cehreli Zafer C, Uyanik Mehmet Ozgur, Durmaz Veli, Vallittu Pekka K, Lassila Lippo V J
Department of Endodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
Dent Traumatol. 2014 Jun;30(3):246-9. doi: 10.1111/edt.12070. Epub 2013 Sep 18.
The aim of the study was to evaluate the regional push-out bond strength of mineral trioxide aggregate (MTA) after exposure to sodium hypochlorite (NaOCl), ethylenediaminetetraacetic (EDTA), and peracetic acid (PAA) irrigation solutions.
1-mm-thick longitudinal slabs of root dentin were obtained from freshly extracted human canine teeth (n = 80). Simulated root perforation defects, 1 mm in diameter, were prepared in the coronal, middle, and apical thirds of radicular dentin. Mineral trioxide aggregate was placed into the cavities, and the specimens were stored for 1 week at 37°C. Thereafter, the specimens were randomly divided into four groups (n = 20) according to the irrigation solution applied over the repair sites: Group 1-10 ml of 5.25% NaOCl for 10 min; Group 2-10 ml of 5.25% NaOCl for 10 min, followed by 5 ml 17% EDTA for 5 min; Group 3-10 ml of 5.25% NaOCl for 10 min, followed by application of 5 ml 1% PAA for 5 min; and Group 4-no irrigation. Push-out test was performed at a crosshead speed of 1 mm/min. Debonding values were compared statistically using two-way analysis of variance and Tukey tests (P < 0.05).
The push-out bond strength of MTA was not affected by the type of irrigation solution or location of the perforation defects (both P < 0.05). Stereomicroscopic inspection of the samples showed that the bond failure was predominantly adhesive.
Exposure of repaired root perforations to 5.25% NaOCl, 17% EDTA, or 1% PAA does not alter the dislocation resistance of MTA at different locations of root dentin.
本研究旨在评估次氯酸钠（NaOCl）、乙二胺四乙酸（EDTA）和过氧乙酸（PAA）冲洗液作用后三氧化矿物凝聚体（MTA）的区域推出粘结强度。
从新鲜拔除的人犬齿（n = 80）获取1毫米厚的根牙本质纵向切片。在根牙本质的冠部、中部和根尖三分之一处制备直径1毫米的模拟根穿孔缺损。将三氧化矿物凝聚体放入洞中，标本在37°C下储存1周。此后，根据修复部位使用的冲洗液将标本随机分为四组（n = 20）：第1组 - 10毫升5.25% NaOCl冲洗10分钟；第2组 - 10毫升5.25% NaOCl冲洗10分钟，随后5毫升17% EDTA冲洗5分钟；第3组 - 10毫升5.25% NaOCl冲洗10分钟，随后5毫升1% PAA冲洗5分钟；第4组 - 不冲洗。以1毫米/分钟的十字头速度进行推出试验。使用双向方差分析和Tukey检验对脱粘值进行统计学比较（P < 0.05）。
MTA的推出粘结强度不受冲洗液类型或穿孔缺损位置的影响（P均< 0.05）。对样本的体视显微镜检查表明，粘结失败主要为粘结性。
修复后的根穿孔暴露于5.25% NaOCl、17% EDTA或1% PAA不会改变MTA在根牙本质不同位置的抗脱位性。
