Department of Paediatric Dentistry, Faculty of Dentistry, Ankara Yıldırım Beyazıt University, Ankara, Turkey.
Biomed Res Int. 2021 Jul 2;2021:6567161. doi: 10.1155/2021/6567161. eCollection 2021.
To evaluate the voids in root canal treatment of deciduous molar canals using three obturating materials and two obturation systems using micro-CT. . Thirty freshly extracted deciduous molars were used in this study. The specimens were instrumented using a ProTaper Universal rotary instrument and randomly assigned into six groups ( = 5). Mesiobuccal root canals were obturated using Ca(OH) and iodoform-Ca(OH) and ZOE cement. The materials were applied straight from the syringe up to the 2 mm coronal level of the apex. Subsequently, the Lentulo spiral and ultrasonic activation with endoactivator were used for obturation. All samples were scanned by micro-CT with 9.1 m isotropic voxel resolution. The voids in cross-sectional images and 3D volumes of voids were measured. Differences among materials were statically evaluated ( < 0.05).
All study groups showed voids. Ca(OH) and iodoform-Ca(OH) with ultrasonic activation produced fewer voids whereas the ZOE groups showed higher voids with statistical significance ( < 0.05).
Ca(OH) and iodoform-Ca(OH) with ultrasonic activation decrease void formation. Further studies should be done with other obturation techniques and materials for deciduous tooth root canal management.
使用微 CT 评估 3 种根管封闭材料和 2 种根管封闭系统在乳磨牙根管治疗中的空隙。 本研究使用 30 颗新鲜拔出的乳磨牙。使用 ProTaper Universal 根管旋转器械对标本进行器械处理，并随机分为 6 组（每组 5 个）。使用氢氧化钙和碘仿-氢氧化钙以及 ZOE 水泥对近中颊根根管进行封闭。将材料直接从注射器中注入到根尖 2mm 的牙冠水平。然后，使用 Lentulo 螺旋和 Endoactivator 进行超声激活进行封闭。所有样本均使用具有 9.1µm 各向同性体素分辨率的微 CT 进行扫描。测量横截面图像和 3D 体积中的空隙。使用统计学方法评估（<0.05）材料之间的差异。 结果：所有研究组均存在空隙。使用超声激活的氢氧化钙和碘仿-氢氧化钙产生的空隙较少，而 ZOE 组的空隙较大，具有统计学意义（<0.05）。 结论：使用超声激活的氢氧化钙和碘仿-氢氧化钙可减少空隙形成。应该使用其他根管封闭技术和材料进一步研究乳磨牙根管管理。
