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IP Indian Journal of Conservative and Endodontics

Impact of sterilization on the fracture resistance of Hyflex instrument’s used in different simulated canals

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Article Type : Research Article

Author Details: Emre Övsay*

Volume : 4

Issue : 3

Online ISSN : 2581-8988

Print ISSN : 2581-9534

Article First Page : 91

Article End Page : 92


To evaluate the cyclic fatigue and the fracture resistance of engine-driven Hyflex instruments used in different simulated canals. A total of 90 Hyflex instruments size 25 used during root canal were tested. Each group was divided into 3 subgroups (n=10). The first group sterilized before usage, the second group used as factory prepared and the third group used 10sec for shaping then it was sterilized and used again to be tested in simulated canals with 60º, 45º and 90º angles of curvature and a 3 mm radius at a constant speed of 500 rpm and 2.5 nm torque until they were fractured. The time of fracture for each instrument was recorded. The data was compared using one-way analysis of variance followed by Anova test. Approximately one third of instruments became deformed as a result of usage. The instruments used then sterilized and re-used again are resulted in a significantly longer cyclic fatigue life (P < 0>
Conclusions: Multiple use of size 25, 0.08 taper Hyflex instruments are reliable to use after sterilization.

Keywords: Hyflex, Cyclic fatique, Fracture resistance,

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