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Evaluation of Cyclic Fatigue Resistance of Three Different Niti Rotary Systems-An Invitro Study


Affiliations
1 Post graduate Student, Sree Balaji Dental College and Hospital, Bharath University, Chennai, India
2 Professor, Sree Balaji Dental College and Hospital, Bharath University, Chennai, India
3 Assistant Professor, Sree Balaji Dental College and Hospital, Bharath University, Chennai, India
4 Reader, Department of Conservative Dentistry and Endodontics, Sree Balaji Dental College and Hospital, Bharath University, Chennai, India
5 HOD & Professor, Department of Conservative Dentistry and Endodontics, Sree Balaji Dental College and Hospital, Bharath University, Chennai, India
     

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Aim: The aim of this study is to compare and evaluate the cyclic fatigue resistance of 3 different Nickel Titanium rotary file systems: Hyflex CM, Neoendo Flex files and ProTaper Gold by static method in three different curvatures, namely, 45°, 60° and 90°.

Materials and Method: Thirty Hyflex CM (25/.06), Thirty Neoendo Flex (25/.06) and Thirty Protaper Gold (25/.08) instruments were included in this study. The static cyclic fatigue test was performed using a custom-made jig. The artificial canal is made of stainless steel jig with an inner diameter of 1.5mm, a 45°, 60°, 90° angles of curvature and radii of curvature of 5 mm. All the instruments were rotated according to manufacturer’s recommendations until failure occurred. The time taken to failure was recorded in seconds for each group using a digital chronometer. The data were analyzed statistically using one way ANOVA, Post hoc test of Bonferroni was performed to identify pair-wise significance via SPSS 21.0 software (SPSS Inc, Chicago, IL). The statistical significance was set at 5%.

Result: In 45° and 60° Hyflex CM and Neoendo Flex are better than Pro Taper Gold. At 90°, Neoendo Flex is better than Hyflex CM (P<.05).

Conclusion: Within the limitation of this study, it can be concluded that, Neoendo Flex files exhibited highest cyclic fatigue resistance at 90° angle of curvature. In 45° and 60° angle of curvature Neoendo Flex files and Hyflex CM rotary instrument were more resistant to cyclic fatigue. Protaper Gold showed the least cyclic fatigue resistance than the other files tested.


Keywords

Cyclic Fatigue, Nickel Titanium Alloy, Neoendo Flex, Protaper Gold, Hyflex CM, Instrument Design.
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  • Evaluation of Cyclic Fatigue Resistance of Three Different Niti Rotary Systems-An Invitro Study

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Authors

Thirunavukkarasu Manojkumar
Post graduate Student, Sree Balaji Dental College and Hospital, Bharath University, Chennai, India
Paramasivam Vivekanandhan
Professor, Sree Balaji Dental College and Hospital, Bharath University, Chennai, India
Malarvizhi Dhakshinamoorthy
Assistant Professor, Sree Balaji Dental College and Hospital, Bharath University, Chennai, India
Ramachandran Tamilselvi
Reader, Department of Conservative Dentistry and Endodontics, Sree Balaji Dental College and Hospital, Bharath University, Chennai, India
Arunajatesan Subbiya
HOD & Professor, Department of Conservative Dentistry and Endodontics, Sree Balaji Dental College and Hospital, Bharath University, Chennai, India

Abstract


Aim: The aim of this study is to compare and evaluate the cyclic fatigue resistance of 3 different Nickel Titanium rotary file systems: Hyflex CM, Neoendo Flex files and ProTaper Gold by static method in three different curvatures, namely, 45°, 60° and 90°.

Materials and Method: Thirty Hyflex CM (25/.06), Thirty Neoendo Flex (25/.06) and Thirty Protaper Gold (25/.08) instruments were included in this study. The static cyclic fatigue test was performed using a custom-made jig. The artificial canal is made of stainless steel jig with an inner diameter of 1.5mm, a 45°, 60°, 90° angles of curvature and radii of curvature of 5 mm. All the instruments were rotated according to manufacturer’s recommendations until failure occurred. The time taken to failure was recorded in seconds for each group using a digital chronometer. The data were analyzed statistically using one way ANOVA, Post hoc test of Bonferroni was performed to identify pair-wise significance via SPSS 21.0 software (SPSS Inc, Chicago, IL). The statistical significance was set at 5%.

Result: In 45° and 60° Hyflex CM and Neoendo Flex are better than Pro Taper Gold. At 90°, Neoendo Flex is better than Hyflex CM (P<.05).

Conclusion: Within the limitation of this study, it can be concluded that, Neoendo Flex files exhibited highest cyclic fatigue resistance at 90° angle of curvature. In 45° and 60° angle of curvature Neoendo Flex files and Hyflex CM rotary instrument were more resistant to cyclic fatigue. Protaper Gold showed the least cyclic fatigue resistance than the other files tested.


Keywords


Cyclic Fatigue, Nickel Titanium Alloy, Neoendo Flex, Protaper Gold, Hyflex CM, Instrument Design.



DOI: https://doi.org/10.37506/v11%2Fi1%2F2020%2Fijphrd%2F193904