在模拟体温条件下，EdgeTaper 铂金根管锉的循环疲劳和扭断失效。

Cyclic Fatigue and Torsional Failure of EdgeTaper Platinum Endodontic Files at Simulated Body Temperature.

机构信息

Restorative and Prosthetic Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia, and King Abdullah International Medical Research Centre, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia.

出版信息

J Endod. 2019 May;45(5):611-614. doi: 10.1016/j.joen.2019.02.008. Epub 2019 Mar 29.

DOI:10.1016/j.joen.2019.02.008

PMID:30930015

Abstract

INTRODUCTION

The aim of this in vitro study was to compare the cyclic fatigue resistance and torsional resistance of EdgeTaper Platinum (ETP) with those of ProTaper Gold (PTG) at simulated body temperature.

METHODS

ETP and PTG files with #25 tip size were selected. Cyclic fatigue tests were performed in a stainless steel artificial canal until file fracture occurred. The time to fracture was recorded. For the torsional resistance testing, the apical 5 mm of the file was firmly secured with acrylic resin, and the assembly was fixed over torque gauge device. A uniform torsional stress was applied with continuous rotation motion until fracture occurred. The torque at failure was recorded. Both experiments were conducted at 35 ± 1°C. Fractured surfaces were tested via scanning electron microscopy. Statistical analysis was performed using independent Student t test at 5% significance level.

RESULTS

The ETP had superior cyclic fatigue resistance than PTG (P < .01). However, it exhibited lower torsional resistance (P < .05). The ETP and PTG showed typical features of cyclic and torsional fatigue behavior under scanning electron microscopy.

CONCLUSIONS

The ETP exhibited superior resistance to cyclic fatigue but failed to show any improvement in the torsional resistance compared with PTG.

摘要

简介

本体外研究旨在比较 EdgeTaper Platinum（ETP）和 ProTaper Gold（PTG）在模拟体温下的循环疲劳强度和抗扭强度。

方法

选取尖端尺寸为#25 的 ETP 和 PTG 锉。在不锈钢人工根管中进行循环疲劳试验，直至锉断裂。记录断裂时间。在扭转阻力测试中，用丙烯酸树脂将锉的尖端 5mm 处固定，并将组件固定在扭矩计装置上。施加均匀的扭转力，同时进行连续旋转运动，直至发生断裂。记录失效时的扭矩。两项实验均在 35°C±1°C 下进行。通过扫描电子显微镜测试断裂表面。使用独立学生 t 检验，在 5%的显著水平下进行统计分析。