Sujith Immadi Laxmi, Teja Kavalipurapu Venkata, Ramesh Sindhu
Department of Conservative Dentistry and Endodontics, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Chennai, Tamil Nadu, India.
J Conserv Dent. 2021 Jul-Aug;24(4):314-322. doi: 10.4103/jcd.jcd_651_20. Epub 2022 Jan 13.
Irrigation dynamics vary in optimally shaped canals. Various factors combine to create a stress-induced environment leading to a dynamic irrigant flow.
The aim of the study is to evaluate the irrigant flow and apical pressure using 30G open-ended needle in virtually created root canal model of single-rooted teeth.
Sixty extracted single-rooted premolars were selected and prepared using a single rotary instrument Hyflex CM and grouped as - Group I: 30 size 0.6% taper ( = 15), Group II: 30 size 0.4% taper ( = 15), Group III: 25 size 0.6% taper ( = 15), and Group IV: 25 size 0.4% taper ( = 15). Postinstrumentation imaging was carried out using cone-beam computed tomography, and computer-aided design models were obtained. Subgrouping was done based on the nozzle position, and computational fluid dynamic analysis was carried out for the respective parameters assessed.
Statistical significance was elicited in all the groups at different nozzle positions analyzed ( < 0.05). A post hoc test revealed significance in the mean flow rate and flow velocity in Group I at low nozzle position ( < 0.05) as compared to others.
30 size 0.6% tapered preparations proved efficient irrigant flow and least apical pressures at all nozzle positions.
在形状优化的根管中，冲洗动力学有所不同。多种因素共同作用，营造出一个由应力诱导的环境，从而导致冲洗液动态流动。
本研究旨在使用30G开放式针头，在虚拟创建的单根牙根管模型中评估冲洗液流量和根尖压力。
选取60颗拔除的单根前磨牙，使用单一旋转器械Hyflex CM进行预备，并分为四组：第一组：30号、锥度0.6%（n = 15）；第二组：30号、锥度0.4%（n = 15）；第三组：25号、锥度0.6%（n = 15）；第四组：25号、锥度0.4%（n = 15）。根管预备后，使用锥形束计算机断层扫描进行成像，并获得计算机辅助设计模型。根据针头位置进行亚组划分，并对评估的各个参数进行计算流体动力学分析。
在分析的不同针头位置，所有组均具有统计学意义（P < 0.05）。事后检验显示，与其他组相比，第一组在低针头位置时平均流速和流速具有显著性差异（P < 0.05）。
30号、锥度0.6%的根管预备在所有针头位置均显示出有效的冲洗液流动和最小的根尖压力。
