Department of Endodontics, Faculdade de Medicina Dentária, Universidade de Lisboa, Lisboa, Portugal.
Egas Moniz Center for Interdisciplinary Research (CiiEM), Almada, Portugal.
Aust Endod J. 2024 Apr;50(1):40-51. doi: 10.1111/aej.12805. Epub 2023 Oct 17.
This study aims to assess the influence of root canal preparation, irrigation needle design and its placement depth in the irrigation flow of confluent canals during syringe irrigation. A mandibular molar presenting two confluent canals in its mesial root was sequentially prepared and scanned by micro-computed tomography after mechanical preparation up to ProTaper Next system sizes X2 (25/.06v), X3 (30/.07v) and X4 (40/.06v). In each of the root canal preparation models, a side-vented and an open-ended needle at 5, 3 and 2 mm from the working length were included, and irrigation flow was assessed by a validated computational fluid dynamics model. The results revealed that the irrigant flowed out of the confluent canals mainly through the canal that did not have the needle. Apical penetration and renewal of the irrigant were most efficiently achieved with the use of a 30G open-ended needle and a 30/.07v preparation.
本研究旨在评估根管预备、冲洗针设计及其在注射器冲洗时在汇合根管中的放置深度对汇合根管冲洗流的影响。一颗下颌磨牙的近中根有两个汇合根管，在机械预备至 ProTaper Next 系统尺寸 X2（25/.06v）、X3（30/.07v）和 X4（40/.06v）后，用微计算机断层扫描进行了连续扫描。在每个根管预备模型中，均包含一个侧孔冲洗针和一个开口冲洗针，从工作长度起 5、3 和 2 毫米处各有一个，并用经过验证的计算流体动力学模型评估冲洗流。结果表明，冲洗剂主要从没有针的根管流出汇合根管。使用 30G 开口冲洗针和 30/.07v 预备，冲洗剂的根尖渗透和更新效果最佳。
