Türker Sevinç Aktemur, Uzunoğlu-Özyürek Emel, Kaşikçi Sena, Öndeş Melike, Geneci Ferhat, Çelik Hakan Hamdi
Faculty of Dentistry, Department of Endodontics, Zonguldak Bülent Ecevit University, Zonguldak, Turkey.
Faculty of Dentistry, Department of Endodontics, Hacettepe University, Ankara, Turkey.
Microsc Res Tech. 2021 Jun;84(6):1265-1271. doi: 10.1002/jemt.23685. Epub 2020 Dec 30.
Separated root canal instruments may affect the quality of root canal obturation and hence the survival of endodontically treated teeth. Obturation techniques may influence filling-quality. The aim was to evaluate the obturation quality of teeth filled with different obturation techniques in the presence of apically separated instruments using micro-computed tomography (μ-CT). Notched ProTaper F2 rotary-files were separated in the apical third of 36-human mandibular incisors with single root/canal and mature apex. Samples were filled by an endodontist according to one of the following obturation techniques (n = 12): cold lateral-compaction (CLC), single-cone (SC) and thermoplastic injection (TI). Samples were scanned by the Skyscan 1,274® μ-CT device after 1-week at 37°C in 100% humidity. Images of the sections were evaluated with CTan software in terms of total-volume and volume percentage of the filling materials and voids between coronal end of the separated instrument and gutta-percha/sealer filled void-free sections. Data was analyzed using Kruskal-Wallis and Mann Whitney-U tests with a significance level of 5%. Kruskal-Wallis revealed differences among groups (p < 0.05).Pairwise comparisons revealed that less volume of voids were measured in SC (0.02 ± 0.03 mm ) compared to CLC (0.15 ± 0.16 mm ) and TI (0.18 ± 0.24 mm ) (p < 0.05); while TI was statistically similar with CLC (p > 0.05). Percentages of volumes of voids and filling materials were as follows for SC, CLC and TI, respectively: 8.88 ± 18.52% and 24.45 ± 38.40%, 46.92 ± 33.53% and 53.07 ± 33.53%, 40.54 ± 33.85% and 42.79 ± 34.45%. The obturation technique may have a significant impact on the volume of voids in the presence of a separated file. No obturation technique produced a void-free root canal filling.
根管器械分离可能会影响根管充填质量，进而影响牙髓治疗后牙齿的存留。充填技术可能会影响充填质量。本研究旨在使用微型计算机断层扫描（μ-CT）评估在根尖部存在器械分离的情况下，采用不同充填技术充填的牙齿的充填质量。将有缺口的ProTaper F2旋转锉分离于36颗单根/单根管且根尖成熟的人下颌切牙的根尖三分之一处。由一名牙髓病医生根据以下充填技术之一对样本进行充填（n = 12）：冷侧向加压充填（CLC）、单锥充填（SC）和热塑性注射充填（TI）。样本在37°C、湿度100%的环境中放置1周后，使用Skyscan 1,274® μ-CT设备进行扫描。使用CTan软件根据充填材料的总体积以及分离器械冠端与牙胶/封闭剂充填的无空隙部分之间的空隙的体积百分比对切片图像进行评估。使用Kruskal-Wallis检验和Mann Whitney-U检验对数据进行分析，显著性水平为5%。Kruskal-Wallis检验显示各组之间存在差异（p < 0.05）。两两比较显示，与CLC（0.15±0.16 mm³）和TI（0.18±0.24 mm³）相比，SC组测量到的空隙体积较小（0.02±0.03 mm³）（p < 0.05）；而TI组与CLC组在统计学上相似（p > 0.05）。SC、CLC和TI组的空隙体积百分比和充填材料体积百分比分别如下：8.88±18.52%和24.45±38.40%，46.92±33.53%和53.07±33.53%，40.54±33.85%和42.79±34.45%。在存在器械分离的情况下，充填技术可能对空隙体积有显著影响。没有一种充填技术能实现无空隙的根管充填。
