Alsubait Sara A
Department of Restorative Dental Science, College of Dentistry King Saud University, Riyadh, Kingdom of Saudi Arabia, e-mail:
J Contemp Dent Pract. 2017 Apr 1;18(4):289-294. doi: 10.5005/jp-journals-10024-2033.
This study aimed to evaluate the push-out bond strength of NeoMTA Plus (NMTA), EndoSequence root repair material fast set putty (ERRMF), biodentine (BD), and ProRoot white mineral trioxide aggregate (PMTA) when used as perforation repair materials after exposure to 2.5% sodium hypochlorite (NaOCl) during the early setting phase.
Horizontal midroot sections were prepared from single-rooted human teeth. Sections (n = 144) were randomly divided into four groups: PMTA, BD, NMTA, and ERRMF. Materials were condensed and allowed to set for 10 minutes. The groups were further divided into two subgroups. The NaOCl group included specimens that were immersed in 2.5% NaOCl for 30 minutes, and the control group included specimens on which a wet cotton pellet was placed over the test material. After 48 hours, the highest force applied to the materials at the time of dislodgement was recorded. Slices were then examined under a digital microscope to evaluate the nature of the bond failure. The surfaces of two specimens from each subgroup were observed by scanning electron microscopy. Data were statistically analyzed with two-way and one-way analysis of variances, independent t-tests, and chi-square tests. The statistical significance was set at 0.05.
In NaOCl-treated groups, PMTA showed a significantly higher push-out bond strength than the other three materials (p = 0.00). In the control groups, the bond strength of BD was significantly higher than that of PMTA, ERRMF, and NMTA (p < 0.05). Compared with the control group, NaOCl treatment significantly increased the push-out bond strength of PMTA (p = 0.00) and ERRMF (p = 0.00) and significantly reduced the bond strength of BD (p = 0.00) and NMTA (p = 0.03). None of the specimens showed an adhesive type of failure. The majority of the samples exhibited a cohesive failure type. Morphological observations revealed that the surfaces exhibited cubic crystals. In ERRMF, the crystals were few in number. Sodium hypochlorite enhanced the crystallization of NMTA.
The push-out bond strengths of PMTA and ERRMF were significantly increased after exposure to 2.5% NaOCl in the early setting phase, and those of BD and NMTA were significantly decreased.
The results of the present study suggest that early exposure of NaOCl increase the push-out bond strength of PMTA and ERRMF. PMTA had the highest push-out values. Therefore, it would be a potentially useful perforation repair material for single visit endodontic treatment.
本研究旨在评估在固化早期暴露于2.5%次氯酸钠（NaOCl）后，NeoMTA Plus（NMTA）、EndoSequence根充修复材料快速凝固型糊剂（ERRMF）、生物陶瓷（BD）和ProRoot白色矿物三氧化物凝聚体（PMTA）作为穿孔修复材料时的推出粘结强度。
从单根人牙制备水平根中截面。切片（n = 144）随机分为四组：PMTA、BD、NMTA和ERRMF。材料进行压实并放置10分钟使其凝固。这些组进一步分为两个亚组。NaOCl组包括浸泡在2.5% NaOCl中30分钟的标本，对照组包括在测试材料上放置湿棉球的标本。48小时后，记录材料在脱落时施加的最大力。然后在数字显微镜下检查切片以评估粘结失败的性质。通过扫描电子显微镜观察每个亚组的两个标本的表面。数据采用双向和单向方差分析、独立t检验和卡方检验进行统计学分析。统计学显著性设定为0.05。
在NaOCl处理组中，PMTA的推出粘结强度显著高于其他三种材料（p = 0.00）。在对照组中，BD的粘结强度显著高于PMTA、ERRMF和NMTA（p < 0.05）。与对照组相比，NaOCl处理显著提高了PMTA（p = 0.00）和ERRMF（p = 0.00）的推出粘结强度，并显著降低了BD（p = 0.00）和NMTA（p = 0.03）的粘结强度。所有标本均未显示粘结型失败。大多数样本表现为内聚破坏型。形态学观察显示表面呈现立方晶体。在ERRMF中，晶体数量较少。次氯酸钠增强了NMTA的结晶。
在固化早期暴露于2.5% NaOCl后，PMTA和ERRMF的推出粘结强度显著增加，而BD和NMTA的推出粘结强度显著降低。
本研究结果表明，早期暴露于NaOCl可增加PMTA和ERRMF的推出粘结强度。PMTA具有最高的推出值。因此，它可能是单次就诊根管治疗中一种潜在有用的穿孔修复材料。
