寻径器械几种镍钛合金制造的抗扭疲劳性能。

Torsional fatigue resistance of pathfinding instruments manufactured from several nickel-titanium alloys.

机构信息

Department of Dentistry, Endodontics and Dental Materials, Bauru Dental School, University of São Paulo, Bauru, SP, Brazil.

Department of Restorative Dentistry, Araraquara Dental School, São Paulo State University, Araquara, SP, Brazil.

出版信息

Int Endod J. 2018 Jun;51(6):697-704. doi: 10.1111/iej.12879. Epub 2017 Dec 22.

DOI:10.1111/iej.12879

PMID:29171880

Abstract

AIM

To evaluate the torsional properties of pathfinding nickel-titanium (NiTi) rotary instruments manufactured from several NiTi alloys, ProGlider (M-wire), Hyflex GPF (conventional NiTi Wire and controlled memory wire), Logic (conventional NiTi wire and controlled memory wire) and Mtwo (conventional NiTi wire).

METHODOLOGY

A total of 56 NiTi instruments from Glidepath rotary systems (n = 8) were used: Logic (size 25, .01 taper), Logic CM (size 25, .01 taper), ProGlider (size 16, .02 taper), Hyflex GPF (size 15, .01 taper), Hyflex GPF CM (size 15, .02 taper; size 20, .02 taper) and Mtwo (size 10, .04 taper). The torsion tests were performed based on ISO 3630-1 (1992). Three millimetres of each instrument tip was clamped to a small load cell by a lever arm linked to the torsion axis. Data were analysed using a one-way analysis of variance (anova) and Tukey test with a significance level at a = 5%.

RESULTS

The Logic size 25, .01 taper had significantly higher torsional strength values (P < 0.05). The ProGlider was significantly different when compared with Hyflex GPF size 15, .01 taper and size 15, .02 taper (P < 0.05). The Logic CM size 25, .01 taper had significantly higher torsional strength than Hyflex GPF size 15, .01 taper and size 15, .02 taper (P < 0.05). No difference was found amongst Mtwo size 10, .04 taper and Hyflex GPF groups (size 15, .01 taper; size 15, .02 taper; size 20, .02 taper). In relation to the angle of rotation, Logic CM size 25, .01 taper and Hyflex GPF size 15, .01 taper had the highest angle values (P < 0.05). The ProGlider had the lowest angle values in comparison with all the groups (P < 0.05) followed by Mtwo size 10, .04 taper. The Logic size 25, .01 taper had significantly higher angle of rotation values than ProGlider and Mtwo size 10, .04 taper (P < 0.05).

CONCLUSION

The Logic size 25, .01 taper instrument made of conventional NiTi alloy had the highest torsional strength of all instruments tested. In addition, the ProGlider instrument manufactured from M-Wire alloy had the lowest angle of rotation to fracture in comparison with the other instruments.

摘要

目的

评估源自几种镍钛合金的寻迹镍钛（NiTi）旋转器械的扭转性能，包括 ProGlider（M 丝）、Hyflex GPF（常规 NiTi 丝和控记忆丝）、Logic（常规 NiTi 丝和控记忆丝）和 Mtwo（常规 NiTi 丝）。

方法

共使用了 56 根来自 Glidepath 旋转系统的 NiTi 器械（n=8）：Logic（尺寸 25，.01 锥度）、Logic CM（尺寸 25，.01 锥度）、ProGlider（尺寸 16，.02 锥度）、Hyflex GPF（尺寸 15，.01 锥度）、Hyflex GPF CM（尺寸 15，.02 锥度；尺寸 20，.02 锥度）和 Mtwo（尺寸 10，.04 锥度）。扭转试验按照 ISO 3630-1（1992）进行。每个器械尖端的 3 毫米部分通过与扭转轴相连的杠杆臂夹在一个小负载单元上。使用单向方差分析（anova）和 Tukey 检验对数据进行分析，显著性水平为 a=0.05。

结果

Logic 尺寸 25，.01 锥度的扭转强度值显著更高（P<0.05）。ProGlider 与 Hyflex GPF 尺寸 15，.01 锥度和尺寸 15，.02 锥度的差异显著（P<0.05）。Logic CM 尺寸 25，.01 锥度的扭转强度显著高于 Hyflex GPF 尺寸 15，.01 锥度和尺寸 15，.02 锥度（P<0.05）。Mtwo 尺寸 10，.04 锥度与 Hyflex GPF 组（尺寸 15，.01 锥度；尺寸 15，.02 锥度；尺寸 20，.02 锥度）之间没有差异。在旋转角度方面，Logic CM 尺寸 25，.01 锥度和 Hyflex GPF 尺寸 15，.01 锥度的角度值最高（P<0.05）。ProGlider 与所有组相比角度值最低（P<0.05），其次是 Mtwo 尺寸 10，.04 锥度。Logic 尺寸 25，.01 锥度的旋转角度值显著高于 ProGlider 和 Mtwo 尺寸 10，.04 锥度（P<0.05）。