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• W2101673513 abstract "Abstract Aim To analyse the type and location of defects in H y F lex CM instruments after clinical use in a graduate endodontic programme and to examine the impact of clinical use on their metallurgical properties. Methodology A total of 468 H y F lex CM instruments discarded from a graduate endodontic programme were collected after use in three teeth. The incidence and type of instrument defects were analysed. The lateral surfaces of the defect instruments were examined by scanning electron microscopy. New and clinically used instruments were examined by differential scanning calorimetry ( DSC ) and x‐ray diffraction ( XRD ). Vickers hardness was measured with a 200‐g load near the flutes for new and clinically used axially sectioned instruments. Data were analysed using one‐way anova or Tukey's multiple comparison test. Results Of the 468 H y F lex instruments collected, no fractures were observed and 16 (3.4%) revealed deformation. Of all the unwound instruments, size 20, .04 taper unwound the most often ( n = 5) followed by size 25, .08 taper ( n = 4). The trend of DSC plots of new instruments and clinically used (with and without defects) instruments groups were very similar. The DSC analyses showed that H y F lex instruments had an austenite transformation completion or austenite‐finish ( A f ) temperature exceeding 37 °C. The A f temperatures of H y F lex instruments (with or without defects) after multiple clinical use were much lower than in new instruments ( P < 0.05). The enthalpy values for the transformation from martensitic to austenitic on deformed instruments were smaller than in the new instruments at the tip region ( P < 0.05). XRD results showed that N i T i instruments had austenite and martensite structure on both new and used H y F lex instruments at room temperature. No significant difference in microhardness was detected amongst new and used instruments (with and without defects). Conclusions The risk of H y F lex instruments fracture in the canal is very low when instruments are discarded after three cases of clinical use. New H y F lex instruments were a mixture of martensite and austenite structure at body temperature. Multiple clinical use caused significant changes in the microstructural properties of H y F lex instruments. Smaller instruments should be considered as single‐use." @default.
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• W2101673513 date "2013-01-21" @default.
• W2101673513 modified "2023-10-18" @default.
• W2101673513 title "HyFlex nickel-titanium rotary instruments after clinical use: metallurgical properties" @default.
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• W2101673513 doi "https://doi.org/10.1111/iej.12049" @default.
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