Purpose. The aim of this in vitro study was to evaluate the quality of four root canal obturation techniques using microcomputed tomography (micro-CT). Materials and Methods. A total of 36 mandibular first premolars with mostly round canals were decoronated, then instrumented up to a size F3 rotary file, and dressed with an epoxy resin-based sealer. Subsequently, they were divided into 4 different groups () based on the method of obturation: lateral condensation using 0.02 tapered master cone (LC2), lateral condensation using 0.04 tapered master cone (LC4), matched single-cone technique (MS), and matched single cone-mediated ultrasonic activation (MSUA). All the teeth were scanned using micro-CT (resolution of 19 μm), and the percentage volume of voids was calculated. One-way analysis of variance and Tukey test were used to analyze the data (). Results. The total percentage volume of voids was significantly lower in the MSUA group compared to all other groups (). The total percentage volume of voids was significantly lower in the MS group compared to the LC4 () and LC2 () groups. However, there was no significant difference between the LC2 and LC4 groups (). Conclusions. MSUA, significantly, showed the least root canal filling voids amongst all the obturation techniques studied. MSUA can be considered an effective method for the filling of the round root canals. In general, lateral condensation using either 0.02 or 0.04 tapered master cones had significantly the highest volume percentage of voids amongst the experimental groups.

中文翻译：

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四种根管充填技术的显微CT评估

目的。这项体外研究的目的是使用微型计算机断层扫描 (micro-CT) 评估四种根管充填技术的质量。材料和方法。总共对 36 颗主要为圆形根管的下颌第一前磨牙进行了修复，然后使用 F3 旋转锉进行器械固定，并使用环氧树脂基封闭剂进行修复。随后，他们被分为4个不同的组（)基于封闭方法：使用 0.02 锥形主锥 (LC2) 的侧向冷凝、使用 0.04 锥形主锥 (LC4) 的侧向冷凝、匹配的单锥技术 (MS) 和匹配的单锥介导超声激活 (MSUA) . 使用显微CT（分辨率为19μm ）扫描所有牙齿 ，并计算空隙体积百分比。数据分析采用单因素方差分析和Tukey检验（）。 结果。与所有其他组相比，MSUA 组的总空隙体积百分比显着降低（）。与 LC4 相比，MS 组的空隙总体积百分比显着降低（)和 LC2 ()组。然而，LC2 和 LC4 组之间没有显着差异（）。 结论。在所有研究的充填技术中，MSUA 显着显示出最少的根管填充空隙。MSUA可以被认为是填充圆形根管的有效方法。一般来说，使用 0.02 或 0.04 锥形主锥的横向冷凝在实验组中具有显着最高的空隙体积百分比。