A root-end filling material is required to fill the root-end cavity without gaps or voids, to prevent root canal reinfection and to provide periapical healing. Thus, this study evaluated the volume of marginal gaps and voids of three root-end filling materials using microcomputed tomography (micro-CT). Thirty maxillary incisors were prepared and filled with gutta-percha and endodontic sealer. The specimens were scanned using micro-CT and distributed into three groups (n = 10): White MTA, MTA Repair HP, and Bio-C Repair. The root tips were resected at 90° to the longitudinal axis and the cavity (3 mm depth) was prepared with an ultrasonic tip. The materials were handled, and the cavities were filled. The specimens were rescanned and the percentual volume of gaps and voids were analyzed. The data were analyzed using Kruskal–Wallis and Dunn tests (p < .05). No statistical difference was found in the percentage of gaps among the tested materials (p > .05). White MTA presented less voids than Bio-C and MTA Repair HP (p < .05). The materials presented a similar percentual volume of gaps and White MTA presented less voids than other tested materials.

中文翻译：

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三种根端填充材料的边缘间隙和空隙：微计算机断层扫描研究

需要根端填充材料来填充根端腔而没有间隙或空隙，以防止根管再感染并提供根尖周愈合。因此，本研究使用微型计算机断层扫描 (micro-CT) 评估了三种根端填充材料的边缘间隙和空隙的体积。准备三十颗上颌切牙并用牙胶和牙髓封闭剂填充。使用显微CT扫描标本并分为三组（n = 10)：白色 MTA、MTA 修复 HP 和 Bio-C 修复。在与纵轴成 90° 的位置切除根尖，并用超声波尖端制备空腔（3 mm 深）。处理了材料，并填充了空腔。重新扫描样品并分析间隙和空隙的百分比体积。使用 Kruskal-Wallis 和 Dunn 检验分析数据 ( p  < .05)。测试材料之间的间隙百分比没有发现统计学差异（p  > .05）。白色 MTA 的空隙比 Bio-C 和 MTA Repair HP 少 ( p  < .05)。与其他测试材料相比，这些材料呈现出相似的百分比体积百分比，而白色 MTA 呈现出更少的空隙。