Comparative Evaluation Of Cyclic Fatigue Resistance Of Hyflex Cm With Newer Gold Treated Niti File Systems: An In Vitro Study

Document Type : Primary Research paper

Authors

1 B.D.S., Third year Postgraduate student, Department of Conservative Dentistry and Endodontics, Sree Balaji Dental College and Hospital, Bharath Institute of Higher Education and Research, Narayanapuram, Pallikaranai, Chennai -600100. Tamilnadu, India

2 M.D.S., Professor & Head of the department, Department of Conservative Dentistry and Endodontics, Sree Balaji Dental College and Hospital, Bharath Institute of Higher Education and Research, Narayanapuram, Pallikaranai, Chennai -600100. Tamilnadu, India.

3 M.D.S., Professor Department of Conservative Dentistry and Endodontics, Sree Balaji Dental College and Hospital, Bharath Institute of Higher Education and Research, Narayanapuram, Pallikaranai, Chennai -600100. Tamilnadu, India.

Abstract

Objective: The aim of this study was to evaluate cyclic fatigue resistance of three control
memory wire based instruments namely, Hyflex CM NiTi files (Coltene/ Whaldent,
Switzerland), M3 Pro Gold NiTi files (United Dental, Shanghai, China) and NeoEndo
Flex NiTi files (Orikam health care, Gurgaon, India) in an extreme canal curvature.
Method: A total of 30 NiTi instruments of three different rotary systems weretested using a
custom made jig that reproduces a curvature of 90° and 5mm radius. All of the files were
used in the artificial canals until the fracture occurred. The time to fracture for each
group was recorded using digital chronometer. Using the time data, the numbers of cycles
to failure (NCF) were calculated. The mean, standard deviation and standard error of thethree groups were calculated and statistically analyzed using SPSS software 21.0 version.
One-way analysis of variance (ANOVA) was done to determine significant differences
among the systems, between groups and within groups. Post Hoc test of Tukey was
performed to identify pair-wise significance.
Results: NeoEndo Flex had highest NCF followed by M3 Pro Gold and Hyflex CM with a
mean of 425.310, 380.060 and 259.960 NCF respectively. On one way ANOVA the three
groups had statistically significant difference (P value = 0.025) and on Post hoc Tukey
HSD between all the three groups NeoEndo Flex vs. Hyflex CM was statistically
significant (P value = 0.024).
Conclusion: Within the limitations of present study, NeoEndo Flex had significantly
higher cyclic fatigue resistance than Hyflex CM in 90 degree canal curvature and among
all the three NiTi systems.

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