纤维面积比和循环次数与镍钛锉抗断裂性能的关系

IF 3.5 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of endodontics Pub Date : 2025-05-01 DOI:10.1016/j.joen.2025.02.004

Hyeonu Jo DDS, MS , Sang Won Kwak DDS, MS, PhD , Asgeir Sigurdsson DDS, MS , Hyeon-Cheol Kim DDS, MS, PhD

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引用次数: 0

摘要

本研究旨在评估NiTi旋转锉的纤维面积比与失效循环次数（NCF）在抗疲劳断裂方面的相关性。方法：采用定制的模拟35°管曲率的装置（n = 24），对尺寸为F2 （25 mm）的ProTaper Universal （PTU）和ProTaper Gold （PTG）锉进行循环疲劳断裂试验。利用断裂碎片，采用扫描电子显微镜（SEM）对断裂面进行了分析，重点分析了截面上的纤维区域。使用ImageJ软件计算纤维面积比，并通过将断裂时间乘以转速来确定NCF。统计学分析各组间差异及纤维面积比与NCF的相关性（P < 0.05）。结果：扫描电镜分析显示PTU档案中纤维面积比较高（P < 0.05）。相关分析显示两组患者纤维面积比与NCF之间的相关性较弱。PTG组NCF明显高于PTU组（P < 0.05）。PTG组纤维面积比显著低于PTU组（P < 0.05）。结论：虽然PTG文件显示了由于热处理而提高的循环疲劳抗力，但纤维面积比并不是NCF的一个强有力的代表因素或预测因素。热处理对材料抗断裂性能的影响大于循环疲劳断裂的扩展过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Correlation Between Fibrous Area Ratio and Numbers of Cycles to Fracture Resistances of Nickel-Titanium Files

Introduction

This study aimed to evaluate the correlation between the fibrous area ratio and the number of cycles to failure (NCF) in terms of fatigue fracture resistance of nickel-titaniumrotary files.

Methods

ProTaper Universal (PTU) and ProTaper Gold (PTG) files of size F2 (25 mm) were tested to make cyclic fatigue fracture using a custom-made device simulating a 35° canal curvature (n = 24). Using the fractured fragments, scanning electron microscopy was taken to analyze the fracture surfaces, focusing on fibrous areas on the cross-sections. Fibrous area ratios were calculated using ImageJ software, and NCF was determined by multiplying the time to fracture by rotational speed. Statistical analysis was performed to evaluate differences between groups and assess the correlation between fibrous area ratio and NCF (P < .05).

Results

Scanning electron microscopy analysis revealed a higher fibrous area ratio in PTU files (P < .05). The correlation analysis indicated a weak relationship between fibrous area ratio and NCF in both groups. PTG files demonstrated significantly higher NCF compared to PTU files (P < .05). PTG group had a significantly lower fibrous area ratio than the PTU group (P < .05).

Conclusions

While PTG files show improved cyclic fatigue resistance due to thermal processing, the fibrous area ratio is not a strong representing factor or predictor of NCF. Heat treatment influences the property of fracture resistance more significantly than propagation process of cyclic fatigue fracture.

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来源期刊

Journal of endodontics 医学-牙科与口腔外科

CiteScore

8.80

自引率

9.50%

发文量

224

审稿时长

42 days

期刊介绍： The Journal of Endodontics, the official journal of the American Association of Endodontists, publishes scientific articles, case reports and comparison studies evaluating materials and methods of pulp conservation and endodontic treatment. Endodontists and general dentists can learn about new concepts in root canal treatment and the latest advances in techniques and instrumentation in the one journal that helps them keep pace with rapid changes in this field.