The present study evaluated the quality of single-cone root canal fillings with bioceramic (BC) sealer using three different techniques by means of micro-computed tomography (micro-CT). The canals of 30 extracted single-rooted permanent teeth were shaped with R40 Reciproc blue files and filled with the single-cone technique (SCT). BioRoot RCS BC sealer was placed inside the canals with one of the following master cones: R40 cone to working length (RWL, n = 10); R40 cone trimmed 1 mm short of working length (RWL-1, n = 10); non-standardized gutta-percha cone to working length (NSWL, n = 10). A quantitative and qualitative micro-CT analysis assessed the filling quality and internal/external voids formation. Collected data underwent statistical analysis by multivariate one-way analysis of variance (α = 0.05). In all groups, the voids were minimal and prevalently external. The NSWL and RWL-1 groups had increased sealer ratios in the whole canal and the apical canal portion, respectively. The lowest amounts of voids were found in the RWL group; the void volumes were slightly greater in the RWL-1 mm and NSWL groups, especially at the apical level. Two alternative SCTs showed satisfactory filling ability, uniform distribution of the BC sealer, and a minimally increased voids formation compared to the standard SCT with dedicated cone. The two tested alternative SCTs could take advantage of the beneficial characteristics of the BC sealer, which evenly filled the endodontic space, ideally sealing both the major and the accessory communications with the periodontium.

本研究通过显微计算机断层扫描 (micro-CT) 使用三种不同的技术评估了带有生物陶瓷 (BC) 封闭剂的单锥根管充填物的质量。拔出的 30 颗单根恒牙的根管用 R40 Reciproc 蓝锉成型，并用单锥技术 (SCT) 填充。BioRoot RCS BC 封闭剂使用以下主锥体之一放置在根管内：R40 锥体至工作长度（RWL，n  = 10）；R40 锥体比工作长度短 1 毫米（RWL-1，n  = 10）；非标准化牙胶锥到工作长度 (NSWL, n = 10）。定量和定性微 CT 分析评估了填充质量和内部/外部空隙的形成。收集的数据通过多元单向方差分析（α = 0.05）进行统计分析。在所有组中，空隙都很小，而且普遍存在于外部。NSWL 和 RWL-1 组分别增加了全根管和根尖管部分的封闭剂比率。在 RWL 组中发现的空隙量最少；RWL-1 mm 和 NSWL 组的空隙体积略大，尤其是在根尖水平。与具有专用锥体的标准 SCT 相比，两种替代 SCT 显示出令人满意的填充能力、BC 封闭剂的均匀分布以及最少增加的空隙形成。