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    Comparison of cyclic fatigue resistance between heat-treated and conventional retreatment files
    (Spemd-Soc Portuguesa Estomatologia & Medicina Dentaria, 2023) Ozkan, Hatice Buyukozer; Surme, Koray; Akman, Hayri; Er, Kursat
    Objectives: To compare the cyclic fatigue resistances of MicroMega Remover, EndoArt, and ProTaper nickel-titanium retreatment files when used in curved artificial canals.Methods: A total of 45 new C-wire Remover, controlled-memory wire EndoArt D2, and non heat-treated NiTi ProTaper D2 retreatment files, 15 per group, were tested in a stainless-steel block containing an 18-mm-long artificial canal with curvature in the apical third, an inner diameter of 1.5 mm, a curvature angle of 60 degrees, and a radius of curvature of 5 mm. The experimental system was filled with distilled water, and the ambient temperature was kept constant at 35 +/- 1 degrees C. The retreatment files were rotated until fracture to calculate the number of cycles to failure. The length of each fractured fragment was recorded. The number of cycles to failure and the fragment length values were analyzed using one-way analysis of variance (ANOVA) and Tukey post-hoc tests. The statistical significance level was set at p<0.05.Results: The group with the highest number of cycles to failure values was EndoArt D2 (1401.33 +/- 279.00), followed by MicroMega Remover (950.07 +/- 195.84) and ProTaper D2 (341.87 +/- 48.12), with a statistically significant difference between all file systems tested (p<0.05). No difference was observed among the retreatment files regarding the lengths of fractured fragments.Conclusions: The EndoArt D2 file exhibited greater cyclic fatigue resistance than the MicroMega Remover and ProTaper D2 files. (Rev Port Estomatol Med Dent Cir Maxilofac. 2023;64(3):112-117)(c) 2023 Sociedade Portuguesa de Estomatologia e Medicina Dent & aacute;ria. Published by SPEMD. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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    Öğe
    Comparison of cyclic fatigue resistance of four pediatric rotary file systems at body temperature: an in vitro study
    (Bmc, 2024) Surme, Koray; Akman, Hayri; Ozkan, Hatice Buyukozer; Er, Kursat
    Background The aim of this study was to compare the cyclic fatigue resistance (CFR) of the newly developed pediatric nickel-titanium (NiTi) rotary file systems for root canal preparation of primary teeth. Methods Eighty pediatric NiTi rotary file systems files were used in this study, including 20 EasyInSmile X-Baby (25/0.04), 20 Scope miniScope (25/0.04), 20 EndoArt Pedo Gold (25/0.04), and 20 EndoArt Pedo Blue (25/0.04) files. Static CFR tests; performed on a custom-made stainless steel block with an inner diameter of 1.5 mm, an angle of curvature of 60 degrees and a curved artificial canal with a radius of curvature of 5 mm. The test system was filled with distilled water and the temperature was kept constant at 35 +/- 1 degrees C. The files were rotated in the simulated canal until fracture occurred. The number of cycles to failure (NCF) data was recorded, and all the fracture surfaces of the files were evaluated using scanning electron microscopy (SEM). One-way ANOVA and Tukey tests were used for statistical analysis of the data, and the significance level was set at p < 0.05. Results EndoArt Pedo Blue showed the highest NCF values (2668.10 +/- 755.26), while the miniScope showed the lowest NCF values (453.65 +/- 72.51), with a statistically significant difference between all the tested file systems (p < 0.05). There was no statistical difference in terms of fractured fragment lengths among all tested files (p > 0.05). Conclusion The EndoArt Pedo Blue file system showed the best CFR performance among the four file systems specifically designed for primary teeth.