室温及体温条件下不同镍钛器械在单弯和双弯形态下的循环疲劳性能：一项实验室研究。

Cyclic fatigue resistance of different nickel-titanium instruments in single and double curvature at room and body temperatures: A laboratory study.

机构信息

Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy.

Department of Biomedical and Dental Sciences and Morphological and Functional Imaging, Messina University, Messina, Italy.

出版信息

Aust Endod J. 2023 Dec;49(3):592-598. doi: 10.1111/aej.12789. Epub 2023 Aug 17.

DOI:10.1111/aej.12789

PMID:37592880

Abstract

The aim of this study was to compare the cyclic fatigue resistance of nickel-titanium instruments inside single and double-curved canals at different temperatures. 160 HyFlex EDM #20.05 (HEDM), VDW.ROTATE #20.05 and #25.06, Mtwo #25.06 were randomised (n = 10) for the dynamic cyclic fatigue tests according to the curvature (i.e. single and double) at 20° ± 1°C and 35° ± 1°C. The number of cycles to fracture (NCF) was analysed by two-way ANOVA with p < 0.05. Fatigue resistance of all instruments significantly decreased at body temperature in single and double curvatures, except for HEDM in double curvature. The NCF was significantly lower in double curvature than single at both temperatures for all files, except for VDW.ROTATE #20.05 at 35° ± 1°C. Within the study limitations, temperature significantly impaired cyclic fatigue resistance of all files except HEDM #20.05 in double curvature. Similarly, double curvature had a detrimental effect on cyclic fatigue resistance of all files except for VDW.ROTATE #20.05 at body temperature.

摘要

本研究旨在比较不同温度下单弯和双弯根管内镍钛器械的循环疲劳性能。根据曲率（即单弯和双弯），将 160 HyFlex EDM #20.05（HEDM）、VDW.ROTATE #20.05 和 #25.06、Mtwo #25.06 随机分配（n=10）进行动态循环疲劳试验，温度分别为 20°C±1°C 和 35°C±1°C。通过双因素方差分析（p<0.05）对断裂的循环次数（NCF）进行分析。除了双弯的 HEDM 外，所有器械在单弯和双弯的体温下的疲劳阻力均显著降低。除了 35°C±1°C 时的 VDW.ROTATE #20.05，所有器械在双弯时的 NCF 均显著低于单弯。在研究限制内，温度显著降低了除 HEDM #20.05 外的所有器械的循环疲劳阻力，在双弯时也是如此。同样，除了体温下的 VDW.ROTATE #20.05，双弯对所有器械的循环疲劳阻力都有不利影响。