镍钛根管锉的疲劳循环断裂特性及扭转性能

Cyclic fatigue and fracture characteristics of ground and twisted nickel-titanium rotary files.

机构信息

Department of Conservative Dentistry, School of Dentistry, Pusan National University, Busan, Korea.

出版信息

J Endod. 2010 Jan;36(1):147-52. doi: 10.1016/j.joen.2009.09.037.

DOI:10.1016/j.joen.2009.09.037

PMID:20003955

Abstract

INTRODUCTION

The purposes of this study were to compare the fatigue resistance of traditional, ground nickel-titanium rotary instruments with the Twisted File and to examine the fracture characteristics of the fatigued fragment.

METHODS

Size #25, 0.06 tapered, TF (SybronEndo), RaCe (FKG Dentaire), Helix (DiaDent), and ProTaper F1 (Dentsply Maillefer) were examined with scanning electron microscope for surface characteristics before subjected to a cyclic (rotational bending) fatigue test. The time until fracture was recorded to calculate the number of revolutions for each instrument. The data were compared for differences by using analysis of variance and post hoc Scheffé test. The fragments were examined with scanning electron microscope both in lateral view and fractographically.

RESULTS

TF showed a significantly higher resistance to cyclic fatigue than other nickel-titanium files that were manufactured with a grinding process (P < .05). The path of crack propagation appeared to be different for electropolished (TF and RaCe) versus non-electropolished (Helix and ProTaper) instruments.

CONCLUSIONS

Although all specimens showed similar fractographic appearance, which indicated a similar fracture mechanism, instruments with abundant machining grooves seemed to have a higher risk of fatigue.

摘要

简介

本研究旨在比较传统的镍钛旋转器械与 TwistFile（TF）的抗疲劳性能，并观察疲劳断裂的特征。

方法

对 #25 号、0.06 锥度的 TF（登士柏 SybronEndo）、RaCe（菲格 FKG Dentaire）、Helix（登士柏 DiaDent）和 ProTaper F1（登士柏 Maillefer）进行表面特征的扫描电子显微镜检查，然后进行循环（旋转弯曲）疲劳试验。记录每种器械发生断裂的时间，以计算每个器械的旋转次数。使用方差分析和事后 Scheffé 检验比较数据差异。通过扫描电子显微镜以侧视和断口形貌学观察断裂碎片。