Department of Restorative Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia.
Department of Restorative Sciences, Riyadh Elm University, Riyadh, Saudi Arabia, e-mail:
J Contemp Dent Pract. 2021 Oct 1;22(10):1175-1183.
This article aims to evaluate the residual filling materials after retreatment of bioceramic sealer used in the obturation technique of mandibular molars with different root curvatures using microcomputed tomography (micro-CT).
A total of 106 canals of mandibular molar teeth with closed apex, no fracture, calcification, or previously root canals treated were selected. Each tooth was mounted in acrylic resin blocks, and canals were instrumented with 06 One Curve rotary file and filled with gutta-percha and EndoSequence bioceramic (group A) or AH Plus sealer (group B) then subdivided into three groups (each) based on the degree of root curvature; mild (≤15°), moderate (16-30°), or severe (≥31°). Retreatment was done with the same rotary file. Samples were scanned before and after retreatment, and the volume of the residual materials was calculated. Data were statistically analyzed.
The micro-CT scans show remaining filling in all canal levels of the two groups after retreatment. The mean values of all canals in bioceramic as well as AH Plus samples were significantly higher at coronal level ( < 0.001). In addition, the mean differences of distolingual canal after retreatment were not significantly different between the three levels in bioceramic group ( = 0.051). In regard to the AH Plus group, the mean values of mesiolingual canal after retreatment were statistically significant higher at coronal level ( < 0.001).
Micro-CT tool provides a clear 3D visualization. Remnants of Bioceramic and AH Plus sealers were detected in different canal curvatures. The use of One Curve rotary file did not improve the removal of the filling materials.
It is difficult to achieved complete removal of bioceramic filling material from the root canal system using rotary file.
本文旨在使用微计算机断层扫描（micro-CT）评估不同根管弯曲度下颌磨牙根管封闭技术中使用的生物陶瓷密封剂再治疗后的残余填充材料。
共选择了 106 个根尖闭合、无骨折、钙化或以前根管治疗过的下颌磨牙根管。每个牙齿都安装在丙烯酸树脂块中，用 06 One Curve 旋转锉根管预备，并用牙胶和 EndoSequence 生物陶瓷（A 组）或 AH Plus 密封剂（B 组）填充，然后根据根管弯曲度分为三组（每组）；轻度（≤15°）、中度（16-30°）或重度（≥31°）。用相同的旋转锉进行再治疗。在再治疗前后对样本进行扫描，并计算残余材料的体积。对数据进行统计学分析。
微 CT 扫描显示两组再治疗后所有根管水平均有残留填充物。生物陶瓷和 AH Plus 样本所有根管的平均值在冠部水平均显著较高（<0.001）。此外，生物陶瓷组远中根管再治疗后的平均差异在三个水平之间无显著差异（=0.051）。关于 AH Plus 组，再治疗后的近中舌根管的平均值在冠部水平显著较高（<0.001）。
微 CT 工具提供了清晰的 3D 可视化。在不同的根管弯曲度下，检测到生物陶瓷和 AH Plus 密封剂的残余物。One Curve 旋转锉的使用并不能改善填充物的去除。
使用旋转锉很难从根管系统中完全去除生物陶瓷填充材料。
