Effect of repeated simulated clinical use and sterilization on the cutting efficiency and flexibility of Hyflex CM nickel-titanium rotary files

Journal of Endodontics
Scott T SeagoKent A Sabey

Abstract

Recent nickel-titanium manufacturing processes have resulted in an alloy that remains in a twinned martensitic phase at operating temperature. This alloy has been shown to have increased flexibility with added tolerance to cyclic and torsional fatigue. The aim of this study was to assess the effect of repeated simulated clinical use and sterilization on cutting efficiency and flexibility of Hyflex CM rotary files. Cutting efficiency was determined by measuring the load required to maintain a constant feed rate while instrumenting simulated canals. Flexibility was determined by using a 3-point bending test. Files were autoclaved after each use according to the manufacturer's recommendations. Files were tested through 10 simulated clinical uses. For cutting efficiency, mean data were analyzed by using multiple factor analysis of variance and the Dunnett post hoc test (P < .05). For flexibility, mean data were analyzed by using Levene's Test of Equality of Error and a general linear model (P < .05). No statistically significant decrease in cutting efficiency was noted in groups 2, 5, 6, and 7. A statistically significant decrease in cutting efficiency was noted in groups 3, 4, 8, 9, and 10. No statistically significant decrease in...Continue Reading

References

Sep 1, 1965·Oral Surgery, Oral Medicine, and Oral Pathology·S KAKEHASHIR J FITZGERALD
Jun 22, 2011·Journal of Endodontics·Ya ShenMarkus Haapasalo
Aug 19, 2011·Journal of Endodontics·Luca TestarelliGianluca Gambarini
Oct 18, 2011·Journal of Endodontics·Ya ShenMarkus Haapasalo

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Citations

Oct 17, 2017·Clinical Oral Investigations·Amr Elnaghy, Shaymaa Elsaka
Aug 15, 2019·Australian Endodontic Journal : the Journal of the Australian Society of Endodontology Inc·Hüseyin Sinan TopçuoğluHacer Balkaya
Aug 14, 2021·Journal of Dental Research, Dental Clinics, Dental Prospects·Olcay ÖzdemirBaran Can Sağlam

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