中国组织工程研究

中国组织工程研究 ›› 2026, Vol. 30 ›› Issue (32): 8352-8357.doi: 10.12307/2026.884

• 组织工程口腔材料 tissue-engineered oral materials • 上一篇    下一篇

温度对热处理镍钛锉在模拟S形根管内抗疲劳折断性能的影响

付宏宇1，陈文新2，侯晓玫2   

  1. 1北京大学第一医院口腔科，北京市  100034；2北京大学口腔医学院·口腔医院，第二门诊部，国家口腔疾病临床医学研究中心，口腔数字化医疗技术和材料国家工程实验室，口腔数字医学北京市重点实验室，北京市  100101
  • 接受日期:2026-03-03 出版日期:2026-11-18 发布日期:2026-04-23
  • 通讯作者: 侯晓玫，博士，副主任医师，北京大学口腔医学院·口腔医院，第二门诊部，国家口腔疾病临床医学研究中心，口腔数字化医疗技术和材料国家工程实验室，口腔数字医学北京市重点实验室，北京市 100101
  • 作者简介:付宏宇，男，1979年生，吉林省图们市人，汉族，硕士，副主任医师，主要从事口腔生物力学研究。

Cyclic fatigue resistance of heat-treated nickel-titanium files in simulated S-shaped root canals at different temperatures

Fu Hongyu1, Chen Wenxin2, Hou Xiaomei2   

  1. 1Department of Stomatology, Peking University First Hospital, Beijing 100034, China; 2Second Clinical Division, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100101, China 
  • Accepted:2026-03-03 Online:2026-11-18 Published:2026-04-23
  • Contact: Hou Xiaomei, MD, Associate chief physician, Second Clinical Division, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100101, China
  • About author:Fu Hongyu, MS, Associate chief physician, Department of Stomatology, Peking University First Hospital, Beijing 100034, China

PDF

1

摘要：

文题释义：
疲劳折断圈数：镍钛锉在模拟根管中发生折断的时间(s)乘以每秒旋转圈数(即转速)得到的结果为疲劳折断圈数，用于评价该镍钛锉器械的抗疲劳折断性能，疲劳折断圈数越大代表器械的抗疲劳折断性能越好。 
新型热处理镍钛锉：在制造镍钛锉过程中，通过热处理改变镍钛锉的相变温度，从而改变其金相学特性，使镍钛锉更有利于临床的应用。例如，通过热处理可提高CM丝镍钛锉相变温度达到60℃左右，使常温下镍钛合金以马氏体相为主，比高温相奥氏体相更为柔软，由于马氏体相无形状记忆性能，因此CM丝镍钛锉可以预弯，对于有急弯/台阶的根管预备极为有利。

背景：热处理镍钛锉因良好的柔软度逐渐成为临床应用的主流器械，具有较好的根管成形能力，而S形弯曲根管的根管预备是临床根管治疗的难点，在复杂根管中预备器械容易出现器械分离。
目的：比较不同温度下5种新型热处理镍钛锉在模拟S形根管内的抗疲劳断裂性能。
方法：选取Hyflex CM镍钛锉、M3镍钛锉、Plex镍钛锉、Hyflex EDM镍钛锉、R相镍钛锉TF，各20支。使用双弯金属模拟S形根管，分别在室温(24 ℃)及加热罩加热至65 ℃条件下对5种镍钛锉进行了抗疲劳折断性能测试，每种温度每种镍钛锉10个样本，检测疲劳折断圈数与折断长度，利用扫描电子显微镜对镍钛锉工具的断裂面进行细致观察与分析。
结果与结论：①在两种温度下，5种镍钛锉在S形根管内表现出相似的折断模式：首先在根尖弯曲区域出现断裂，随后位于冠方弯曲处发生折断，5组镍钛锉断口在扫描电子显微镜下均符合典型的疲劳折断断口特征；②室温下检测结果：Hyflex EDM组根尖段疲劳折断圈数最高，Plex组根尖段疲劳折断圈数最低，Hyflex CM组冠方段疲劳折断圈数最高，M3组冠方段疲劳折断圈数最低，TF组根尖折断段长度最高，Hyflex EDM组根尖折断段长度最低，Plex组冠方折断段长度最高，Hyflex CM组冠方折断段长度最低；③65 ℃下检测结果：TF组根尖段疲劳折断圈数最高，M3组根尖段疲劳折断圈数最低，Hyflex EDM组冠方段疲劳折断圈数最高，Plex组冠方段疲劳折断圈数最低，Plex组根尖折断段长度最高，M3组根尖折断段长度最低，Hyflex CM组冠方折断段长度最高，Plex组冠方折断段长度最低；④当温度升高至65 ℃时，除了TF组之外，其余4种镍钛锉组在根尖部分和冠方段的疲劳折断圈数值显著低于常温状态下测量结果；随着温度的升高，Hyflex CM、Plex与Hyflex EDM组根尖折断段长度呈现增长趋势，Hyflex CM与M3组冠方折断段长度呈现增长趋势。结果表明：在室温和加热下，Hyflex EDM镍钛锉和R相镍钛锉TF在S形模拟根管内的抗疲劳折断性能较为优越，加热至65 ℃可能使Hyflex CM和Hyflex EDM镍钛锉的抗疲劳折断性能下降。
https://orcid.org/0000-0002-8048-3414(付宏宇)

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料；口腔生物材料；纳米材料；缓释材料；材料相容性；组织工程

关键词: 镍钛根管锉">, 镍钛锉">, S形根管">, 抗疲劳折断性能">, 热处理">, 疲劳折断圈数

Abstract: BACKGROUND: Heat-treated nickel-titanium files have gradually become the mainstream instruments in clinical applications due to their excellent flexibility and good root canal shaping ability. However, root canal preparation of S-shaped curved root canals is a challenging aspect of clinical root canal treatment, and instrument separation is prone to occur in complex root canals.
OBJECTIVE: To compare the cyclic fatigue resistance of five heat-treated nickel-titanium files in simulated S-shaped root canals at different temperatures. 
METHODS: Twenty samples each of Hyflex CM, M3, Plex, Hyflex EDM, and R-phase nickel-titanium files were selected. A double-curved metal simulated S-shaped root canal was used. The cyclic fatigue resistance of the five types of nickel-titanium files was tested at room temperature (24 °C) and at 65 °C using a heating device. Ten samples of each type of nickel-titanium file were tested at each temperature. The number of cyclic fatigue and the fragment length were recorded. The fragment surfaces of the nickel-titanium files were observed and analyzed in detail using a scanning electron microscope.
RESULTS AND CONCLUSION: (1) At both temperatures, the five types of nickel-titanium files showed similar fragment patterns in the S-shaped root canal: fragment first occurred in the apical curvature region, followed by fragment at the coronal curvature. The fragment surfaces of all five groups of nickel-titanium files showed typical cyclic fatigue characteristics under scanning electron microscopy. (2) Results at room temperature: The Hyflex EDM group showed the highest number of cyclic fatigue in the apical segment, while the Plex group showed the lowest. The Hyflex CM group showed the highest number of cyclic fatigue in the coronal segment, while the M3 group showed the lowest. The TF group had the longest apical fragment length, while the Hyflex EDM group had the shortest. The Plex group had the longest coronal fragment length, while the Hyflex CM group had the shortest. (3) Results at 65 °C: The TF group showed the highest number of cyclic fatigue in the apical segment, while the M3 group showed the lowest. The Hyflex EDM group showed the highest number of cyclic fatigue in the coronal segment, while the Plex group showed the lowest. The Plex group had the longest apical fragment length, while the M3 group had the shortest. The Hyflex CM group had the longest coronal fragment length, while the Plex group had the shortest. (4) When the temperature increased to 65 °C, except for the TF group, the cyclic fatigue values of the other four nickel-titanium file groups in both the apical and coronal segments were significantly lower than the values measured at room temperature. With increasing temperature, the apical fragment lengths of the Hyflex CM, Plex, and Hyflex EDM groups showed an increasing trend, and the coronal fragment lengths of the Hyflex CM and M3 groups also showed an increasing trend. The results indicate that, at room temperature and under heating, the Hyflex EDM nickel-titanium file and the R-phase nickel-titanium file TF exhibited superior cyclic fatigue resistance in S-shaped simulated root canals. Heating to 65 °C may reduce the cyclic fatigue resistance of Hyflex CM and Hyflex EDM nickel-titanium files.

Key words: nickel-titanium endodontic files">, nickel-titanium files">, S-shaped root canal">, cyclic fatigue resistance">, heat treatment">, number of cyclic fatigue

中图分类号: