Influence of different cross-section on cyclic fatigue resistance of two nickel–titanium rotary instruments with same heat treatment: An in vitro study

Saudi Endodontic Journal

article

Dario Di Nardo¹  Gianluca Gambarini¹  Marco Seracchiani¹  Alessandro Mazzoni¹  Alessio Zanza¹  Andrea Del Giudice¹  Maurilio D'Angelo¹  LucaTestarelli¹ 

[1] Department of Oral and Maxillo-Facial Sciences, “Sapienza” University of Rome

关键词: Cross-section;    cyclic fatigue;    endodontics;    heat treatment;    nickel–titanium rotary instruments;   

DOI  :  10.4103/sej.sej_124_19

学科分类：口腔科学

来源: Medknow

【 摘 要 】

Introduction: The aim of this study was to investigate the role of the cross-sectional design surface in improving the cyclic fatigue resistance by comparing two nickel–titanium (NiTi) rotary instruments with the same heat-treatment and grinding procedure. Materials and Methods: A total of 40 new NiTi instruments (20 S-One 25.06 taper and 20 AF Blue S4 25.06 taper) were tested in the present study. Both instruments were rotated at 300 rpm and with a torque setting of 2 Ncm) using an endodontic motor in the same artificial canal (90° angle of curvature and 3 mm radius). A Student's t-test was performed to determinate the differences in terms of time to fracture (TtF) and the length of the fractured portion between the two different instruments. Significance was set at P < 0.05. Results: The differences in terms of TtF for cyclic fatigue resistance between the two files were statistically significant (P < 0.05). In terms of fractured length, not statistically significant differences were found (P 0.05). Scanning electron microscopy images showed patterns of cyclic fatigue striations. Conclusion: The results of this study confirm and enhance the role of cross-section in increasing the cyclic fatigue resistance of NiTi rotary instruments.

【 授权许可】

CC BY-NC-SA