Department of Endodontics, Dental Research Center, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Department of Endodontics, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
BMC Oral Health. 2024 Aug 21;24(1):968. doi: 10.1186/s12903-024-04731-7.
The existence of voids within the mineral trioxide aggregate (MTA) composition is one of the factors that can influence the treatment outcome. The primary objective of this study was to quantitatively assess and compare the MTA orthograde obturation quality in severe curved root canals using two different MTA compaction techniques: manual compaction with K-file, or Auger technique using micro-computed tomography (micro-CT) imaging.
For this study, 26 mandibular first molar teeth with severely curved mesiobuccal root canals were selected. These samples were randomly divided into two groups. All root canals were instrumented using ProTaper Gold rotary files up to the F3 file at the working length. In one group, OrthoMTA was compacted using a stainless steel K-file, while in the other group, the Auger technique was employed for compaction into the root canals. Once the MTA had completely set, the filled root canals were subjected to scanning using a high-resolution micro-CT scanner. The porosity volume was determined as a percentage in relation to the overal volume of the canal, and the collected data were subjected to analysis using SPSS software, with the significance level set at P < 0.05.
The two techniques had no significant difference in open, closed, and total mean porosity. In both groups, the mean of open porosity was significantly more than closed porosity.
According to the results of the present study, neither of these two techniques is preferred to the other, and factors such as working time, etc., can be considered to choose the more appropriate clinical technique.
矿化三氧化物聚合体（MTA）中的空隙存在是影响治疗效果的因素之一。本研究的主要目的是使用两种不同的 MTA 压实技术，即手动使用 K 锉压实或使用微计算机断层扫描（micro-CT）成像的螺旋技术，定量评估和比较严重弯曲根管内的 MTA 垂直封闭质量。
本研究选择了 26 颗下颌第一磨牙，具有严重弯曲的近颊根管。这些样本被随机分为两组。所有根管均使用 ProTaper Gold 旋转锉至工作长度的 F3 锉进行器械预备。在一组中，使用不锈钢 K 锉压实 OrthoMTA，而在另一组中，使用螺旋技术将其压实到根管中。一旦 MTA 完全凝固，用高分辨率 micro-CT 扫描仪对填充的根管进行扫描。孔隙体积以相对于根管总体积的百分比表示，并使用 SPSS 软件对收集的数据进行分析，显著性水平设为 P<0.05。
两种技术在开放、封闭和总平均孔隙率方面没有显著差异。在两组中，开放孔隙率的平均值明显高于封闭孔隙率。
根据本研究的结果，这两种技术都没有优势，工作时间等因素可以考虑选择更合适的临床技术。
