5种热处理型镍钛器械的抗弯曲疲劳性能

doi:10.13481/j.1671-587X.20210423

摘要/Abstract

摘要： 目的

比较具有相同尖端直径的Reciproc Blue（RB）、M-Pro（MP）、HyFlex CM（HCM）、Orodeka Plex-2.0（OP）和P3-Blue（PB） 5种热处理型机用镍钛器械（即镍钛锉）的抗弯曲疲劳性能，为临床上热处理型镍钛器械的选择提供参考依据。

方法

选取 RB（25/0.08）、MP（25/0.06）、HCM （25/0.06）、OP （25/0.06）和PB（25/0.06）新镍钛锉各20支，每组再分为2个亚组，每个亚组10支，即60°弯曲模拟根管RB组、HCM组、MP组、OP组和PB组，90°弯曲模拟根管RB组、HCM组、MP组、OP组和PB组。按照厂家所推荐的转速和扭矩设置根管马达，分别在内径为1.5 mm、弯曲半径为5 mm、弯曲角度为60°和90°的金属模拟根管中测试镍钛锉的抗弯曲疲劳性能，用计时器记录每只镍钛锉从开始旋转到疲劳折断的时间（TTF），同时用游标卡尺测量并记录折断段的长度（FL）。收集折断后的镍钛锉，用扫描电子显微镜（SEM）扫描折断后镍钛锉的断面，观察其断端形貌。

结果

在60°弯曲模拟根管中，RB组镍钛锉的TTF最长，HCM组和 MP组次之，OP组和PB组最低；与PB组和OP组比较，MP组、HCM组和RB组镍钛锉的TTF明显增加（P<0.05）；与 MP组和HCM组比较，RB组镍钛锉的TTF明显增加（P<0.05）。在90°弯曲模拟根管中，RB组镍钛锉的TTF最长，MP组次之，HCM组、PB组和OP组最低；与PB组和OP组比较，MP组和RB组镍钛锉的TTF明显增加（P<0.05）；与MP组和HCM组比较，RB组镍钛锉的TTF明显增加（P<0.05）。90°弯曲模拟根管中各亚组镍钛锉的TTF均明显少于60°弯曲模拟根管中相应各亚组（P<0.05）。各组镍钛锉FL比较差异均无统计学意义（P>0.05）。SEM下观察，各组镍钛锉的断面均显示出典型的循环疲劳特征即疲劳条纹和韧窝样结构。

结论

RB镍钛锉在60°和90°弯曲模拟根管内的抗弯曲疲劳性能明显优于其他热处理型镍钛锉。

关键词: 抗弯曲疲劳性能, 镍钛器械, 热处理, 弯曲根管, 器械分离

Abstract: objective

To compare the cyclic fatigue resistance of five kinds of thermally treated nickel-titanium instruments（nickel-titanium files）Reciproc Blue（RB），M-Pro（MP），HyFlex CM（HCM），Orodeka Plex-2.0（OP） and P3-Blue（PB） with the same tip size， and to provide the reference for clinical selection of thermally treated nickel-titanium instruments.

Methods

Twenty new files were selected from RB（25/0.08），MP（25/0.06），HCM（25/0.06），OP（25/0.06）and PB（25/0.06）. Each group was further divided into two subgroups with 10 files in each subgroup： RB group， HCM group， MP group， OP group and PB group under 60 ° bending simulated root canal and RB group， HCM group， MP group， OP group and PB group under 90 ° bending simulated root canal.The root canal motor was set according to the speed and torque recommended by the manufacturer.The flexural fatigue resistance of the nickel-titanium files was tested in the curved simulant canals which were made of stainless steel with an inner diameter of 1.5 mm， 60° and 90°angles of curvatures and a radius of curvature of 5 mm.The time from rotation to fatigue fracture （TTF） of each nickel-titanium file was recorded with a timer， and the length of the fracture segment （FL） was measured and recorded with a vernier caliper.After the experiment， the broken nickel-titanium files were collected， and scanning electron microscopic（SEM） evaluation was performed at the fracture sites to investigate the morphology of fracture.

Results

In 60 ° curved simulated root canals， the TTF of nickel-titanium file in RB group was the longest （P<0.05）， followed by HCM group and MP group （P< 0.05）， and OP group and PB group were the longest（P<0.05）；there was no statistically significant difference in TTF between HCM and MP group（P>0.05）， and there was no statistically significant difference in TTF between OP group and PB group （P>0.05）.In 90 ° curved simulated root canals， the TTF of nickel-titanium file in RB group was the longest（P<0.05）， followed by MP group （P<0.05），and HCM group， PB group and OP group were the lowest（P<0.05）；there were no significant differences in TTF among HCM group， PB group and OP group （P>0.05）.The TTF of nickel-titanium files in each subgroup in simulated root canal bending at 90° were significantly lower than those corresponding subgroups at 60° （P<0.05）.There were no statistically significant differences in FL among all groups （P>0.05）.The cross sections of nickel-titanium files in each group showed typical characteristics of cyclic fatigue including fatigue striations and fibrous dimples under SEM.

Conclusion

RB nickel-titanium file shows statistically higher cyclic fatigue resistance in artificial canals with 60° and 90° than the other nickel-titanium files.

Key words: cyclic fatigue resistance, nickel-titanium instruments, thermal treatment, curved root canal, instrument separation

中图分类号:

R781.05

吴庆翠,王颖艺,马昂,李怡然,焦珊,王成坤,姜秋. 5种热处理型镍钛器械的抗弯曲疲劳性能[J]. 吉林大学学报(医学版), 2021, 47(4): 984-989.

Qingcui WU,Yingyi WANG,Ang MA,Yiran LI,Shan JIAO,Chengkun WANG,Qiu JIANG. Cyclic fatigue resistance of five kinds of thermally treated nickel-titanium instruments[J]. Journal of Jilin University(Medicine Edition), 2021, 47(4): 984-989.

图/表 4

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Group	TTF
Group	60° curvature	90°curvature
PB	407.62±56.01	120.44±16.28^▲
OP	411.39±45.07	107.21±28.91^▲
MP	479.32±33.39^*?	147.54±13.84^*?○▲
HCM	482.83±64.67^*?	120.88±24.56^▲
RB	745.13±66.86^*?#○	240.70±22.63^*?#○▲

Group	FL
Group	60° curvature	90°curvature
PB	3.62±0.50	3.75±0.38
OP	3.52±0.40	3.80±0.40
MP	3.51±0.33	3.80±0.32
HCM	3.69±0.38	4.10±0.57
RB	3.80±0.45	3.92±0.38

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