Aesthetic and restorative dentistry department, College of Dentistry, University of Baghdad, Baghdad, Iraq.
Assistant Professor Dr., Aesthetic and Restorative Dentistry Department, College of Dentistry, University of Baghdad, Baghdad, Iraq.
J Endod. 2024 Jul;50(7):997-1003. doi: 10.1016/j.joen.2024.03.014. Epub 2024 Apr 7.
Pathologic conditions such as internal root resorption (IRR) may complicate root canal filling. This study aimed to evaluate and compare the obturation quality by measuring the percentage of obturation volume (POV) in root canals with artificial IRR obturated with different materials and techniques using cone beam computed tomography (CBCT).
Forty single canal extracted mandibular premolars were decoronated to standardize their length to 14 mm. Following instrumentation, the roots were cut horizontally, and artificial IRR cavities were made at the level of 7 mm from the apex. The root halves were joined using cyanoacrylate adhesive. The samples were randomly assigned to 4 groups (n = 10), and the canals were filled as follows: single-cone technique (SC), bulk-fill Bio-C Sealer (BF), and Bio-C Repair for the coronal and middle third (BCR) + cold lateral condensation technique (CLC) for the apical third and continuous wave compaction technique (CWC). The pre- and postobturation volumes and the POV were measured in the total canal and for the apical, middle, and coronal thirds separately using CBCT and Mimics Medical software. The results were analyzed statistically using one-way ANOVA and Tukey HSD test, and statistical significance was set at P < .05.
BF group resulted in significantly lower total, coronal, middle and apical POV values compared to SC, BCR + CLC, and CWC groups (P < .05), respectively. Also, at the apical third, the BCR + CLC group showed significantly lower POV than the SC and CWC groups (P < .05), respectively. The intra-group comparison showed that BF and BCR + CLC groups had a significantly lower POV in the apical third compared to the middle third (P < .05). Conversely, the CWC group had a significantly higher apical POV than the middle third (P < .05).
The maximum POV was obtained using the CWC technique, Bio-C Repair, and SC technique with Bio-C Sealer, making their application in IRR more preferable than the BF Bio-C Sealer.
诸如内部根吸收（IRR）等病理状况可能会使根管填充复杂化。本研究旨在通过使用锥形束计算机断层扫描（CBCT）测量具有人工 IRR 的根管的封闭体积百分比（POV），来评估和比较使用不同材料和技术进行根管封闭的质量。
对 40 颗单根管下颌前磨牙进行去冠，将其长度标准化至 14mm。根管预备后，将根尖水平切割，在根尖 7mm 处制作人工 IRR 腔。用氰基丙烯酸酯粘合剂将根半部分连接起来。将样本随机分配到 4 组（n=10），并按以下方法填充根管：单尖技术（SC）、块状充填 Bio-C 密封剂（BF）、Bio-C 修复用于冠中和中三分之一（BCR）+冷侧压缩技术（CLC）用于根尖三分之一和连续波压实技术（CWC）。使用 CBCT 和 Mimics Medical 软件分别在总根管和根尖、中三分之一和冠三分之一处测量根管的预填充和填充后体积以及 POV。使用单向方差分析和 Tukey HSD 检验对结果进行统计学分析，统计学意义设定为 P<0.05。
BF 组的总、冠、中、根尖 POV 值明显低于 SC、BCR+CLC 和 CWC 组（P<0.05）。此外，在根尖三分之一处，BCR+CLC 组的 POV 值明显低于 SC 和 CWC 组（P<0.05）。组内比较显示，BF 和 BCR+CLC 组在根尖三分之一处的 POV 值明显低于中三分之一处（P<0.05）。相反，CWC 组在根尖三分之一处的 POV 值明显高于中三分之一处（P<0.05）。
使用 CWC 技术、Bio-C Repair 和 SC 技术与 Bio-C Sealer 获得了最大的 POV，因此与 BF Bio-C Sealer 相比，它们在 IRR 中的应用更可取。
