Department of Conservative Dentistry, School of Dentistry, Gangeung-Wonju National University, Gangneung, Korea.
Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Pusan National University, Yangsan, Korea.
J Endod. 2017 Jul;43(7):1197-1200. doi: 10.1016/j.joen.2017.03.010. Epub 2017 Apr 25.
This study aimed to compare the vibration generated by several nickel-titanium (NiTi) file systems and transmitted to teeth under 2 different motions (continuous rotation motion and reciprocating motion).
Sixty J-shaped resin blocks (Endo Training Bloc-J; Dentsply Maillefer, Ballaigues, Switzerland) were trimmed to a root-shaped form and divided into 2 groups according to the types of electric motors: WaveOne motor (WOM, Dentsply Maillefer) and X-Smart Plus motor (XSM, Dentsply Maillefer). Each group was further subdivided into 3 subgroups (n = 10 each) according to the designated file systems: ProTaper Next (PTN, Dentsply Maillefer), ProTaper Universal (PTU, Dentsply Maillefer), and WaveOne (WOP, Dentsply Maillefer) systems. Vibration was measured during the pecking motion using an accelerometer attached to a predetermined consistent position. The average vibration values were subjected to 2-way analysis of variance as well as the t test and Duncan test for post hoc comparison at the 95% confidence interval.
Both motor types and instrument types produced significantly different ranges of average vibrations. Regardless of the instrument types, the WOM group generated greater vibration than the XSM group (P < .05). Although PTN and PTU did not show significant differences, the WOP group showed significantly greater vibration than the other groups regardless of motor types (P < .05).
Under the limitations of this study design, the reciprocating NiTi file system may generate greater vibration than the continuous rotation NiTi file systems. The motor type also has a significant effect to amplify the vibrations.
本研究旨在比较几种镍钛（NiTi）锉系统在两种不同运动（连续旋转运动和往复运动）下产生的振动，并传递到牙齿上。
将 60 个 J 形树脂块（Endo Training Bloc-J；Dentsply Maillefer，Ballaigues，瑞士）修剪成根形，并根据电动机的类型分为 2 组：WaveOne 电动机（WOM，Dentsply Maillefer）和 X-Smart Plus 电动机（XSM，Dentsply Maillefer）。每组根据指定的锉系统进一步分为 3 个亚组（n = 10 个）：ProTaper Next（PTN，Dentsply Maillefer）、ProTaper Universal（PTU，Dentsply Maillefer）和 WaveOne（WOP，Dentsply Maillefer）系统。使用附在预定一致位置的加速度计在啄动运动期间测量振动。将平均振动值进行双因素方差分析以及 t 检验和 Duncan 检验，以在 95%置信区间内进行事后比较。
两种电动机类型和仪器类型产生的平均振动幅度差异均具有统计学意义。无论仪器类型如何，WOM 组产生的振动均大于 XSM 组（P <.05）。尽管 PTN 和 PTU 之间没有显着差异，但无论电动机类型如何，WOP 组的振动均明显大于其他组（P <.05）。
在本研究设计的限制下，往复式 NiTi 锉系统产生的振动可能大于连续旋转式 NiTi 锉系统。电动机类型也会对振动产生显著影响。
