Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Pusan National University, Yangsan, Korea; Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu, Korea.
Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu, Korea.
J Endod. 2018 Mar;44(3):496-500. doi: 10.1016/j.joen.2017.09.016. Epub 2017 Dec 2.
The purpose of this study was to compare in vitro torque generation during instrumentation with or without glide path establishment.
Endo-training resin blocks with J-shaped canals were randomly divided into 2 groups according to glide path establishment (with or without) and subdivided into 2 subgroups with shaping instruments (WaveOne [Dentsply Maillefer, Ballaigues, Switzerland] or WaveOne Gold [Dentsply Maillefer]) (n = 15). For the glide path-established group, the glide path was prepared using ProGlider (Dentsply Maillefer). During the instrumentation with WaveOne or WaveOne Gold, in vitro torque was measured. The acquired data were analyzed with software. The maximum torque and total torque (the sum of the generated torque) were calculated. The data were statistically evaluated using 2-way analysis of variance and the Duncan post hoc comparison to examine any correlation of torque generation with glide path establishment and nickel-titanium instruments. The significance level was set at 95%.
The generated total torque by WaveOne Gold was significantly reduced by glide path establishment (P < .05), whereas glide path establishment did not induce significant changes in the maximum torque for both file systems. WaveOne Gold with a glide path showed the lowest total torque generation among all groups (P < .05). WaveOne generated a higher maximum torque than WaveOne Gold regardless of the establishment of a glide path (P < .05).
Under the limitations of this study, glide path establishment and the mechanical property of instruments have a significant influence on torque generation. It is recommended to create the glide path and use a flexible file to reduce torque generation and, consequently, the risk of file fracture and root dentin damage.
本研究的目的是比较有无建立导丝通路条件下器械预备过程中的体外扭矩产生情况。
随机将具有 J 形根管的 Endo-training 树脂块分为 2 组，根据是否建立导丝通路（有或无）分组，再根据使用的成形器械（WaveOne [登士柏西诺德，Ballaigues，瑞士]或 WaveOne Gold [登士柏西诺德]）分为 2 个亚组（n=15）。对于建立导丝通路的组，使用 ProGlider（登士柏西诺德）预备导丝通路。在使用 WaveOne 或 WaveOne Gold 进行器械预备过程中，测量体外扭矩。使用软件分析获得的数据。计算最大扭矩和总扭矩（产生扭矩的总和）。使用双因素方差分析和 Duncan 事后比较对数据进行统计学评估，以检验扭矩产生与导丝通路建立和镍钛器械的相关性。显著性水平设为 95%。
WaveOne Gold 的总扭矩在建立导丝通路后显著降低（P<0.05），而对于两种器械系统，建立导丝通路均不会引起最大扭矩的显著变化。在所有组中，带导丝通路的 WaveOne Gold 的总扭矩产生最低（P<0.05）。无论建立导丝通路与否，WaveOne 产生的最大扭矩均高于 WaveOne Gold（P<0.05）。
在本研究的限制条件下，建立导丝通路和器械的机械性能对扭矩产生有显著影响。建议建立导丝通路并使用柔韧性好的器械，以减少扭矩产生，从而降低器械折断和根管牙本质损伤的风险。
