温度对不同热处理镍钛器械在严重弯曲根管内循环疲劳的影响
Influence of Temperature on the Cyclic Fatigue of Nickel-Titanium Instruments with Different Heat Treatments on Severely Curved Canals.
作者信息
Cardoso Ryhan Menezes, Carvalho Alves Nayane Chagas, de Menezes Sílvio Emanuel Acioly Conrado, Batista Shirley Machado, Vieira Thalita Miranda, Elgarten Rocha Giselle Nevares, de Melo Monteiro Gabriela Queiroz, de Albuquerque Diana Santana
机构信息
Department of Operative Dentistry and Endodontics, Dental College of Pernambuco, University of Pernambuco, Camaragibe, Pernambuco, Brazil. Phone: +55 (81) 3184 7659, e-mail:
Department of Operative Dentistry and Endodontics, Dental College of Pernambuco, University of Pernambuco, Camaragibe, Pernambuco, Brazil.
出版信息
J Contemp Dent Pract. 2019 Jun 1;20(6):697-701.
AIM
This study aims to investigate the influence of temperatures of 20 °C and 37 °C on the resistance to cyclic fatigue of NiTi instruments with different heat treatments, as tested in severely curved simulated canals.
MATERIALS AND METHODS
Seventy-two instruments were distributed according to the temperature used (20 °C and 37 °C): XP-endo Shaper (30/0.01), ProDesign Logic (30/0.05), and iRaCe (30/0.04). The instruments were rotated freely until the occurrence of fracture inside an artificial severely curved stainless steel canal, which had a 90° angle of curvature and a curvature radius of 5 mm. Kolmogorov-Smirnov, Wilcoxon, ANOVA, and Kruskal-Wallis tests were performed. A value of <0.05 was considered statistically significant.
RESULTS
XP-endo Shaper instruments presented higher NCF values and time to failure compared with ProDesign Logic and iRaCe instruments at 20 °C and 37 °C ( < 0.001).
CONCLUSION
Within the limitations of this study, the results show that the body temperature (37 °C) significantly lowers the resistance to cyclic fatigue of all instruments compared with 20 °C.
CLINICAL SIGNIFICANCE
Body temperature is an important factor in the results of cyclic fatigue tests.
目的
本研究旨在调查20℃和37℃的温度对经过不同热处理的镍钛器械在严重弯曲模拟根管中测试时抗循环疲劳性能的影响。
材料与方法
根据使用的温度（20℃和37℃）将72支器械进行分配：XP-endo Shaper（30/0.01）、ProDesign Logic（30/0.05）和iRaCe（30/0.04）。将器械在一个人工严重弯曲的不锈钢根管内自由旋转，直到发生断裂，该根管的弯曲角度为90°，曲率半径为5mm。进行了Kolmogorov-Smirnov、Wilcoxon、方差分析和Kruskal-Wallis检验。P值<0.05被认为具有统计学意义。
结果
在20℃和37℃时，与ProDesign Logic和iRaCe器械相比，XP-endo Shaper器械呈现出更高的抗循环疲劳次数（NCF）值和失效时间（P<0.001）。
结论
在本研究的局限性内，结果表明与20℃相比，体温（37℃）显著降低了所有器械的抗循环疲劳性能。
临床意义
体温是循环疲劳测试结果的一个重要因素。
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